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<pre><a name="line-1"></a><span class='hs-comment'>-----------------------------------------------------------</span>
<a name="line-2"></a><span class='hs-comment'>-- |</span>
<a name="line-3"></a><span class='hs-comment'>-- Module : PrimQuery</span>
<a name="line-4"></a><span class='hs-comment'>-- Copyright : Daan Leijen (c) 1999, daan@cs.uu.nl</span>
<a name="line-5"></a><span class='hs-comment'>-- HWT Group (c) 2003, haskelldb-users@lists.sourceforge.net</span>
<a name="line-6"></a><span class='hs-comment'>-- License : BSD-style</span>
<a name="line-7"></a><span class='hs-comment'>-- </span>
<a name="line-8"></a><span class='hs-comment'>-- Maintainer : haskelldb-users@lists.sourceforge.net</span>
<a name="line-9"></a><span class='hs-comment'>-- Stability : experimental</span>
<a name="line-10"></a><span class='hs-comment'>-- Portability : non portable</span>
<a name="line-11"></a><span class='hs-comment'>-- </span>
<a name="line-12"></a><span class='hs-comment'>-- PrimQuery defines the datatype of relational expressions</span>
<a name="line-13"></a><span class='hs-comment'>-- ('PrimQuery') and some useful functions on PrimQuery\'s</span>
<a name="line-14"></a><span class='hs-comment'>--</span>
<a name="line-15"></a><span class='hs-comment'>-- </span>
<a name="line-16"></a><span class='hs-comment'>-----------------------------------------------------------</span>
<a name="line-17"></a><span class='hs-keyword'>module</span> <span class='hs-conid'>Database</span><span class='hs-varop'>.</span><span class='hs-conid'>HaskellDB</span><span class='hs-varop'>.</span><span class='hs-conid'>PrimQuery</span> <span class='hs-layout'>(</span>
<a name="line-18"></a> <span class='hs-comment'>-- * Type Declarations</span>
<a name="line-19"></a>
<a name="line-20"></a> <span class='hs-comment'>-- ** Types</span>
<a name="line-21"></a> <span class='hs-conid'>TableName</span><span class='hs-layout'>,</span> <span class='hs-conid'>Attribute</span><span class='hs-layout'>,</span> <span class='hs-conid'>Scheme</span><span class='hs-layout'>,</span> <span class='hs-conid'>Assoc</span><span class='hs-layout'>,</span> <span class='hs-conid'>Name</span>
<a name="line-22"></a>
<a name="line-23"></a> <span class='hs-comment'>-- ** Data types</span>
<a name="line-24"></a> <span class='hs-layout'>,</span> <span class='hs-conid'>PrimQuery</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-conid'>RelOp</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-conid'>SpecialOp</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span>
<a name="line-25"></a> <span class='hs-layout'>,</span> <span class='hs-conid'>PrimExpr</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-conid'>OrderExpr</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span>
<a name="line-26"></a> <span class='hs-layout'>,</span> <span class='hs-conid'>BinOp</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-conid'>UnOp</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-conid'>OrderOp</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-conid'>AggrOp</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span>
<a name="line-27"></a> <span class='hs-layout'>,</span> <span class='hs-conid'>Literal</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span>
<a name="line-28"></a>
<a name="line-29"></a> <span class='hs-comment'>-- * Function declarations</span>
<a name="line-30"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>extend</span><span class='hs-layout'>,</span> <span class='hs-varid'>times</span>
<a name="line-31"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>attributes</span><span class='hs-layout'>,</span> <span class='hs-varid'>attrInExpr</span><span class='hs-layout'>,</span> <span class='hs-varid'>attrInOrder</span>
<a name="line-32"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>substAttr</span>
<a name="line-33"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>isAggregate</span><span class='hs-layout'>,</span> <span class='hs-varid'>isConstant</span>
<a name="line-34"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>foldPrimQuery</span><span class='hs-layout'>,</span> <span class='hs-varid'>foldPrimExpr</span>
<a name="line-35"></a> <span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-36"></a>
<a name="line-37"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>List</span> <span class='hs-layout'>(</span><span class='hs-layout'>(</span><span class='hs-varop'>\\</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-varid'>union</span><span class='hs-layout'>)</span>
<a name="line-38"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Exception</span> <span class='hs-layout'>(</span><span class='hs-varid'>assert</span><span class='hs-layout'>)</span>
<a name="line-39"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>System</span><span class='hs-varop'>.</span><span class='hs-conid'>Time</span> <span class='hs-layout'>(</span><span class='hs-conid'>CalendarTime</span><span class='hs-layout'>,</span> <span class='hs-varid'>formatCalendarTime</span><span class='hs-layout'>)</span>
<a name="line-40"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>System</span><span class='hs-varop'>.</span><span class='hs-conid'>Locale</span> <span class='hs-layout'>(</span><span class='hs-varid'>defaultTimeLocale</span><span class='hs-layout'>,</span> <span class='hs-varid'>iso8601DateFormat</span><span class='hs-layout'>)</span>
<a name="line-41"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Text</span><span class='hs-varop'>.</span><span class='hs-conid'>PrettyPrint</span><span class='hs-varop'>.</span><span class='hs-conid'>HughesPJ</span>
<a name="line-42"></a>
<a name="line-43"></a><span class='hs-comment'>-----------------------------------------------------------</span>
<a name="line-44"></a><span class='hs-comment'>-- data definitions</span>
<a name="line-45"></a><span class='hs-comment'>-- PrimQuery is the data type of relational expressions.</span>
<a name="line-46"></a><span class='hs-comment'>-- Since 'Project' takes an association, it is actually a</span>
<a name="line-47"></a><span class='hs-comment'>-- projection- and rename-operator at once.</span>
<a name="line-48"></a><span class='hs-comment'>-----------------------------------------------------------</span>
<a name="line-49"></a>
<a name="line-50"></a><a name="TableName"></a><span class='hs-keyword'>type</span> <span class='hs-conid'>TableName</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>String</span>
<a name="line-51"></a><a name="Attribute"></a><span class='hs-keyword'>type</span> <span class='hs-conid'>Attribute</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>String</span>
<a name="line-52"></a><a name="Name"></a><span class='hs-keyword'>type</span> <span class='hs-conid'>Name</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>String</span>
<a name="line-53"></a><a name="Scheme"></a><span class='hs-keyword'>type</span> <span class='hs-conid'>Scheme</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Attribute</span><span class='hs-keyglyph'>]</span>
<a name="line-54"></a><a name="Assoc"></a><span class='hs-keyword'>type</span> <span class='hs-conid'>Assoc</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyglyph'>[</span><span class='hs-layout'>(</span><span class='hs-conid'>Attribute</span><span class='hs-layout'>,</span><span class='hs-conid'>PrimExpr</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>]</span>
<a name="line-55"></a>
<a name="line-56"></a>
<a name="line-57"></a><a name="PrimQuery"></a><span class='hs-keyword'>data</span> <span class='hs-conid'>PrimQuery</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>BaseTable</span> <span class='hs-conid'>TableName</span> <span class='hs-conid'>Scheme</span>
<a name="line-58"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>Project</span> <span class='hs-conid'>Assoc</span> <span class='hs-conid'>PrimQuery</span>
<a name="line-59"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>Restrict</span> <span class='hs-conid'>PrimExpr</span> <span class='hs-conid'>PrimQuery</span>
<a name="line-60"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>Group</span> <span class='hs-conid'>Assoc</span> <span class='hs-conid'>PrimQuery</span>
<a name="line-61"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>Binary</span> <span class='hs-conid'>RelOp</span> <span class='hs-conid'>PrimQuery</span> <span class='hs-conid'>PrimQuery</span>
<a name="line-62"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>Special</span> <span class='hs-conid'>SpecialOp</span> <span class='hs-conid'>PrimQuery</span>
<a name="line-63"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>Empty</span>
<a name="line-64"></a> <span class='hs-keyword'>deriving</span> <span class='hs-layout'>(</span><span class='hs-conid'>Show</span><span class='hs-layout'>)</span>
<a name="line-65"></a>
<a name="line-66"></a><a name="RelOp"></a><span class='hs-keyword'>data</span> <span class='hs-conid'>RelOp</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Times</span>
<a name="line-67"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>Union</span>
<a name="line-68"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>Intersect</span>
<a name="line-69"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>Divide</span>
<a name="line-70"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>Difference</span>
<a name="line-71"></a> <span class='hs-keyword'>deriving</span> <span class='hs-layout'>(</span><span class='hs-conid'>Show</span><span class='hs-layout'>)</span>
<a name="line-72"></a>
<a name="line-73"></a><a name="SpecialOp"></a><span class='hs-keyword'>data</span> <span class='hs-conid'>SpecialOp</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Order</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>OrderExpr</span><span class='hs-keyglyph'>]</span>
<a name="line-74"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>Top</span> <span class='hs-conid'>Int</span>
<a name="line-75"></a> <span class='hs-keyword'>deriving</span> <span class='hs-layout'>(</span><span class='hs-conid'>Show</span><span class='hs-layout'>)</span>
<a name="line-76"></a>
<a name="line-77"></a><a name="OrderExpr"></a><span class='hs-keyword'>data</span> <span class='hs-conid'>OrderExpr</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>OrderExpr</span> <span class='hs-conid'>OrderOp</span> <span class='hs-conid'>PrimExpr</span>
<a name="line-78"></a> <span class='hs-keyword'>deriving</span> <span class='hs-layout'>(</span><span class='hs-conid'>Show</span><span class='hs-layout'>)</span>
<a name="line-79"></a>
<a name="line-80"></a><a name="OrderOp"></a><span class='hs-keyword'>data</span> <span class='hs-conid'>OrderOp</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>OpAsc</span> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>OpDesc</span>
<a name="line-81"></a> <span class='hs-keyword'>deriving</span> <span class='hs-layout'>(</span><span class='hs-conid'>Show</span><span class='hs-layout'>)</span>
<a name="line-82"></a>
<a name="line-83"></a><a name="PrimExpr"></a><span class='hs-keyword'>data</span> <span class='hs-conid'>PrimExpr</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>AttrExpr</span> <span class='hs-conid'>Attribute</span>
<a name="line-84"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>BinExpr</span> <span class='hs-conid'>BinOp</span> <span class='hs-conid'>PrimExpr</span> <span class='hs-conid'>PrimExpr</span>
<a name="line-85"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>UnExpr</span> <span class='hs-conid'>UnOp</span> <span class='hs-conid'>PrimExpr</span>
<a name="line-86"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>AggrExpr</span> <span class='hs-conid'>AggrOp</span> <span class='hs-conid'>PrimExpr</span>
<a name="line-87"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>ConstExpr</span> <span class='hs-conid'>Literal</span>
<a name="line-88"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>CaseExpr</span> <span class='hs-keyglyph'>[</span><span class='hs-layout'>(</span><span class='hs-conid'>PrimExpr</span><span class='hs-layout'>,</span><span class='hs-conid'>PrimExpr</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>]</span> <span class='hs-conid'>PrimExpr</span>
<a name="line-89"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>ListExpr</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>PrimExpr</span><span class='hs-keyglyph'>]</span>
<a name="line-90"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>ParamExpr</span> <span class='hs-layout'>(</span><span class='hs-conid'>Maybe</span> <span class='hs-conid'>Name</span><span class='hs-layout'>)</span> <span class='hs-conid'>PrimExpr</span>
<a name="line-91"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>FunExpr</span> <span class='hs-conid'>Name</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>PrimExpr</span><span class='hs-keyglyph'>]</span>
<a name="line-92"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>CastExpr</span> <span class='hs-conid'>Name</span> <span class='hs-conid'>PrimExpr</span> <span class='hs-comment'>-- ^ Cast an expression to a given type.</span>
<a name="line-93"></a> <span class='hs-keyword'>deriving</span> <span class='hs-layout'>(</span><span class='hs-conid'>Read</span><span class='hs-layout'>,</span><span class='hs-conid'>Show</span><span class='hs-layout'>)</span>
<a name="line-94"></a>
<a name="line-95"></a><a name="Literal"></a><span class='hs-keyword'>data</span> <span class='hs-conid'>Literal</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>NullLit</span>
<a name="line-96"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>DefaultLit</span> <span class='hs-comment'>-- ^ represents a default value</span>
<a name="line-97"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>BoolLit</span> <span class='hs-conid'>Bool</span>
<a name="line-98"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>StringLit</span> <span class='hs-conid'>String</span>
<a name="line-99"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>IntegerLit</span> <span class='hs-conid'>Integer</span>
<a name="line-100"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>DoubleLit</span> <span class='hs-conid'>Double</span>
<a name="line-101"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>DateLit</span> <span class='hs-conid'>CalendarTime</span>
<a name="line-102"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>OtherLit</span> <span class='hs-conid'>String</span> <span class='hs-comment'>-- ^ used for hacking in custom SQL</span>
<a name="line-103"></a> <span class='hs-keyword'>deriving</span> <span class='hs-layout'>(</span><span class='hs-conid'>Read</span><span class='hs-layout'>,</span><span class='hs-conid'>Show</span><span class='hs-layout'>)</span>
<a name="line-104"></a>
<a name="line-105"></a><a name="BinOp"></a><span class='hs-keyword'>data</span> <span class='hs-conid'>BinOp</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>OpEq</span> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>OpLt</span> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>OpLtEq</span> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>OpGt</span> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>OpGtEq</span> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>OpNotEq</span>
<a name="line-106"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>OpAnd</span> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>OpOr</span>
<a name="line-107"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>OpLike</span> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>OpIn</span>
<a name="line-108"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>OpOther</span> <span class='hs-conid'>String</span>
<a name="line-109"></a>
<a name="line-110"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>OpCat</span>
<a name="line-111"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>OpPlus</span> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>OpMinus</span> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>OpMul</span> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>OpDiv</span> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>OpMod</span>
<a name="line-112"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>OpBitNot</span> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>OpBitAnd</span> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>OpBitOr</span> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>OpBitXor</span>
<a name="line-113"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>OpAsg</span>
<a name="line-114"></a> <span class='hs-keyword'>deriving</span> <span class='hs-layout'>(</span><span class='hs-conid'>Show</span><span class='hs-layout'>,</span><span class='hs-conid'>Read</span><span class='hs-layout'>)</span>
<a name="line-115"></a>
<a name="line-116"></a><a name="UnOp"></a><span class='hs-keyword'>data</span> <span class='hs-conid'>UnOp</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>OpNot</span>
<a name="line-117"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>OpIsNull</span> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>OpIsNotNull</span>
<a name="line-118"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>OpLength</span>
<a name="line-119"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>UnOpOther</span> <span class='hs-conid'>String</span>
<a name="line-120"></a> <span class='hs-keyword'>deriving</span> <span class='hs-layout'>(</span><span class='hs-conid'>Show</span><span class='hs-layout'>,</span><span class='hs-conid'>Read</span><span class='hs-layout'>)</span>
<a name="line-121"></a>
<a name="line-122"></a><a name="AggrOp"></a><span class='hs-keyword'>data</span> <span class='hs-conid'>AggrOp</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>AggrCount</span> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>AggrSum</span> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>AggrAvg</span> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>AggrMin</span> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>AggrMax</span>
<a name="line-123"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>AggrStdDev</span> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>AggrStdDevP</span> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>AggrVar</span> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>AggrVarP</span>
<a name="line-124"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>AggrOther</span> <span class='hs-conid'>String</span>
<a name="line-125"></a> <span class='hs-keyword'>deriving</span> <span class='hs-layout'>(</span><span class='hs-conid'>Show</span><span class='hs-layout'>,</span><span class='hs-conid'>Read</span><span class='hs-layout'>)</span>
<a name="line-126"></a>
<a name="line-127"></a>
<a name="line-128"></a><a name="extend"></a><span class='hs-comment'>-- | Creates a projection of some attributes while</span>
<a name="line-129"></a><span class='hs-comment'>-- keeping all other attributes in the relation visible too. </span>
<a name="line-130"></a><span class='hs-definition'>extend</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Assoc</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>PrimQuery</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>PrimQuery</span>
<a name="line-131"></a><span class='hs-definition'>extend</span> <span class='hs-varid'>assoc</span> <span class='hs-varid'>query</span>
<a name="line-132"></a> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Project</span> <span class='hs-layout'>(</span><span class='hs-varid'>assoc</span> <span class='hs-varop'>++</span> <span class='hs-varid'>assoc'</span><span class='hs-layout'>)</span> <span class='hs-varid'>query</span>
<a name="line-133"></a> <span class='hs-keyword'>where</span>
<a name="line-134"></a> <span class='hs-varid'>assoc'</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>assocFromScheme</span> <span class='hs-layout'>(</span><span class='hs-varid'>attributes</span> <span class='hs-varid'>query</span><span class='hs-layout'>)</span>
<a name="line-135"></a>
<a name="line-136"></a><a name="times"></a><span class='hs-comment'>-- | Takes the cartesian product of two queries.</span>
<a name="line-137"></a><span class='hs-definition'>times</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>PrimQuery</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>PrimQuery</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>PrimQuery</span>
<a name="line-138"></a><span class='hs-definition'>times</span> <span class='hs-layout'>(</span><span class='hs-conid'>Empty</span><span class='hs-layout'>)</span> <span class='hs-varid'>query</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>query</span>
<a name="line-139"></a><span class='hs-definition'>times</span> <span class='hs-varid'>query</span> <span class='hs-layout'>(</span><span class='hs-conid'>Empty</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>query</span>
<a name="line-140"></a><span class='hs-definition'>times</span> <span class='hs-varid'>query1</span> <span class='hs-varid'>query2</span> <span class='hs-keyglyph'>=</span>
<a name="line-141"></a> <span class='hs-varid'>assert</span> <span class='hs-layout'>(</span><span class='hs-varid'>length</span> <span class='hs-layout'>(</span><span class='hs-varid'>attributes</span> <span class='hs-varid'>query1</span> <span class='hs-varop'>\\</span> <span class='hs-varid'>attributes</span> <span class='hs-varid'>query2</span><span class='hs-layout'>)</span> <span class='hs-varop'>==</span>
<a name="line-142"></a> <span class='hs-varid'>length</span> <span class='hs-layout'>(</span><span class='hs-varid'>attributes</span> <span class='hs-varid'>query1</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-143"></a> <span class='hs-conid'>Binary</span> <span class='hs-conid'>Times</span> <span class='hs-varid'>query1</span> <span class='hs-varid'>query2</span>
<a name="line-144"></a>
<a name="line-145"></a><a name="attributes"></a><span class='hs-comment'>-- | Returns the schema (the attributes) of a query</span>
<a name="line-146"></a><span class='hs-definition'>attributes</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>PrimQuery</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Scheme</span>
<a name="line-147"></a><span class='hs-definition'>attributes</span> <span class='hs-layout'>(</span><span class='hs-conid'>Empty</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>[]</span>
<a name="line-148"></a><span class='hs-definition'>attributes</span> <span class='hs-layout'>(</span><span class='hs-conid'>BaseTable</span> <span class='hs-varid'>nm</span> <span class='hs-varid'>attrs</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>attrs</span>
<a name="line-149"></a><span class='hs-definition'>attributes</span> <span class='hs-layout'>(</span><span class='hs-conid'>Project</span> <span class='hs-varid'>assoc</span> <span class='hs-varid'>q</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>map</span> <span class='hs-varid'>fst</span> <span class='hs-varid'>assoc</span>
<a name="line-150"></a><span class='hs-definition'>attributes</span> <span class='hs-layout'>(</span><span class='hs-conid'>Restrict</span> <span class='hs-varid'>expr</span> <span class='hs-varid'>q</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>attributes</span> <span class='hs-varid'>q</span>
<a name="line-151"></a><span class='hs-definition'>attributes</span> <span class='hs-layout'>(</span><span class='hs-conid'>Special</span> <span class='hs-varid'>op</span> <span class='hs-varid'>q</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>attributes</span> <span class='hs-varid'>q</span>
<a name="line-152"></a><span class='hs-definition'>attributes</span> <span class='hs-layout'>(</span><span class='hs-conid'>Binary</span> <span class='hs-varid'>op</span> <span class='hs-varid'>q1</span> <span class='hs-varid'>q2</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>op</span> <span class='hs-keyword'>of</span>
<a name="line-153"></a> <span class='hs-conid'>Times</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>attr1</span> <span class='hs-varop'>`union`</span> <span class='hs-varid'>attr2</span>
<a name="line-154"></a> <span class='hs-conid'>Union</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>attr1</span>
<a name="line-155"></a> <span class='hs-conid'>Intersect</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>attr1</span>
<a name="line-156"></a> <span class='hs-conid'>Divide</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>attr1</span>
<a name="line-157"></a> <span class='hs-conid'>Difference</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>attr1</span>
<a name="line-158"></a> <span class='hs-keyword'>where</span>
<a name="line-159"></a> <span class='hs-varid'>attr1</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>attributes</span> <span class='hs-varid'>q1</span>
<a name="line-160"></a> <span class='hs-varid'>attr2</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>attributes</span> <span class='hs-varid'>q2</span>
<a name="line-161"></a><span class='hs-definition'>attributes</span> <span class='hs-layout'>(</span><span class='hs-conid'>Group</span> <span class='hs-keyword'>_</span> <span class='hs-varid'>qry</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>attributes</span> <span class='hs-varid'>qry</span>
<a name="line-162"></a>
<a name="line-163"></a><a name="assocFromScheme"></a><span class='hs-comment'>-- | Returns a one-to-one association of a</span>
<a name="line-164"></a><span class='hs-comment'>-- schema. ie. @assocFromScheme ["name","city"]@ becomes:</span>
<a name="line-165"></a><span class='hs-comment'>-- @[("name",AttrExpr "name"), ("city",AttrExpr "city")]@</span>
<a name="line-166"></a><span class='hs-definition'>assocFromScheme</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Scheme</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Assoc</span>
<a name="line-167"></a><span class='hs-definition'>assocFromScheme</span> <span class='hs-varid'>scheme</span>
<a name="line-168"></a> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>map</span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>\</span><span class='hs-varid'>attr</span> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-varid'>attr</span><span class='hs-layout'>,</span><span class='hs-conid'>AttrExpr</span> <span class='hs-varid'>attr</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <span class='hs-varid'>scheme</span>
<a name="line-169"></a>
<a name="line-170"></a>
<a name="line-171"></a><a name="attrInExpr"></a><span class='hs-comment'>-- | Returns all attributes in an expression.</span>
<a name="line-172"></a><span class='hs-definition'>attrInExpr</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>PrimExpr</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Scheme</span>
<a name="line-173"></a><span class='hs-definition'>attrInExpr</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>concat</span> <span class='hs-varop'>.</span> <span class='hs-varid'>foldPrimExpr</span> <span class='hs-layout'>(</span><span class='hs-varid'>attr</span><span class='hs-layout'>,</span><span class='hs-varid'>scalar</span><span class='hs-layout'>,</span><span class='hs-varid'>binary</span><span class='hs-layout'>,</span><span class='hs-varid'>unary</span><span class='hs-layout'>,</span><span class='hs-varid'>aggr</span><span class='hs-layout'>,</span><span class='hs-sel'>_case</span><span class='hs-layout'>,</span><span class='hs-varid'>list</span><span class='hs-layout'>,</span><span class='hs-varid'>param</span><span class='hs-layout'>,</span><span class='hs-varid'>func</span><span class='hs-layout'>,</span> <span class='hs-varid'>cast</span><span class='hs-layout'>)</span>
<a name="line-174"></a> <span class='hs-keyword'>where</span>
<a name="line-175"></a> <span class='hs-varid'>attr</span> <span class='hs-varid'>name</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyglyph'>[</span><span class='hs-keyglyph'>[</span><span class='hs-varid'>name</span><span class='hs-keyglyph'>]</span><span class='hs-keyglyph'>]</span>
<a name="line-176"></a> <span class='hs-varid'>scalar</span> <span class='hs-varid'>s</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>[]</span><span class='hs-keyglyph'>]</span>
<a name="line-177"></a> <span class='hs-varid'>binary</span> <span class='hs-varid'>op</span> <span class='hs-varid'>x</span> <span class='hs-varid'>y</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>x</span> <span class='hs-varop'>++</span> <span class='hs-varid'>y</span>
<a name="line-178"></a> <span class='hs-varid'>unary</span> <span class='hs-varid'>op</span> <span class='hs-varid'>x</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>x</span>
<a name="line-179"></a> <span class='hs-varid'>aggr</span> <span class='hs-varid'>op</span> <span class='hs-varid'>x</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>x</span>
<a name="line-180"></a> <span class='hs-sel'>_case</span> <span class='hs-varid'>cs</span> <span class='hs-varid'>el</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>concat</span> <span class='hs-layout'>(</span><span class='hs-varid'>uncurry</span> <span class='hs-layout'>(</span><span class='hs-varop'>++</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>unzip</span> <span class='hs-varid'>cs</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <span class='hs-varop'>++</span> <span class='hs-varid'>el</span>
<a name="line-181"></a> <span class='hs-varid'>list</span> <span class='hs-varid'>xs</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>concat</span> <span class='hs-varid'>xs</span>
<a name="line-182"></a> <span class='hs-varid'>param</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>[]</span><span class='hs-keyglyph'>]</span>
<a name="line-183"></a> <span class='hs-varid'>func</span> <span class='hs-keyword'>_</span> <span class='hs-varid'>es</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>concat</span> <span class='hs-varid'>es</span>
<a name="line-184"></a> <span class='hs-varid'>cast</span> <span class='hs-keyword'>_</span> <span class='hs-varid'>expr</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>expr</span>
<a name="line-185"></a>
<a name="line-186"></a><a name="attrInOrder"></a><span class='hs-comment'>-- | Returns all attributes in a list of ordering expressions.</span>
<a name="line-187"></a><span class='hs-definition'>attrInOrder</span> <span class='hs-keyglyph'>::</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>OrderExpr</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Scheme</span>
<a name="line-188"></a><span class='hs-definition'>attrInOrder</span> <span class='hs-varid'>os</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>concat</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>attrInExpr</span> <span class='hs-varid'>e</span> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>OrderExpr</span> <span class='hs-keyword'>_</span> <span class='hs-varid'>e</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>os</span><span class='hs-keyglyph'>]</span>
<a name="line-189"></a>
<a name="line-190"></a><a name="substAttr"></a><span class='hs-comment'>-- | Substitute attribute names in an expression.</span>
<a name="line-191"></a><span class='hs-definition'>substAttr</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Assoc</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>PrimExpr</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>PrimExpr</span>
<a name="line-192"></a><span class='hs-definition'>substAttr</span> <span class='hs-varid'>assoc</span>
<a name="line-193"></a> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>foldPrimExpr</span> <span class='hs-layout'>(</span><span class='hs-varid'>attr</span><span class='hs-layout'>,</span><span class='hs-conid'>ConstExpr</span><span class='hs-layout'>,</span><span class='hs-conid'>BinExpr</span><span class='hs-layout'>,</span><span class='hs-conid'>UnExpr</span><span class='hs-layout'>,</span><span class='hs-conid'>AggrExpr</span><span class='hs-layout'>,</span><span class='hs-conid'>CaseExpr</span><span class='hs-layout'>,</span><span class='hs-conid'>ListExpr</span><span class='hs-layout'>,</span><span class='hs-conid'>ParamExpr</span><span class='hs-layout'>,</span><span class='hs-conid'>FunExpr</span><span class='hs-layout'>,</span><span class='hs-conid'>CastExpr</span><span class='hs-layout'>)</span>
<a name="line-194"></a> <span class='hs-keyword'>where</span>
<a name="line-195"></a> <span class='hs-varid'>attr</span> <span class='hs-varid'>name</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>case</span> <span class='hs-layout'>(</span><span class='hs-varid'>lookup</span> <span class='hs-varid'>name</span> <span class='hs-varid'>assoc</span><span class='hs-layout'>)</span> <span class='hs-keyword'>of</span>
<a name="line-196"></a> <span class='hs-conid'>Just</span> <span class='hs-varid'>x</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>x</span>
<a name="line-197"></a> <span class='hs-conid'>Nothing</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>AttrExpr</span> <span class='hs-varid'>name</span>
<a name="line-198"></a>
<a name="line-199"></a><a name="isConstant"></a><span class='hs-comment'>-- | Determines if a primitive expression represents a constant</span>
<a name="line-200"></a><span class='hs-comment'>-- or is an expression only involving constants.</span>
<a name="line-201"></a><span class='hs-definition'>isConstant</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>PrimExpr</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Bool</span>
<a name="line-202"></a><span class='hs-definition'>isConstant</span> <span class='hs-varid'>x</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>countAttr</span> <span class='hs-varid'>x</span> <span class='hs-varop'>==</span> <span class='hs-num'>0</span>
<a name="line-203"></a> <span class='hs-keyword'>where</span>
<a name="line-204"></a> <span class='hs-varid'>countAttr</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>foldPrimExpr</span> <span class='hs-layout'>(</span><span class='hs-varid'>const</span> <span class='hs-num'>1</span><span class='hs-layout'>,</span> <span class='hs-varid'>const</span> <span class='hs-num'>0</span><span class='hs-layout'>,</span> <span class='hs-varid'>binary</span><span class='hs-layout'>,</span> <span class='hs-varid'>unary</span><span class='hs-layout'>,</span> <span class='hs-varid'>aggr</span><span class='hs-layout'>,</span> <span class='hs-sel'>_case</span><span class='hs-layout'>,</span> <span class='hs-varid'>list</span><span class='hs-layout'>,</span>
<a name="line-205"></a> <span class='hs-varid'>const2</span> <span class='hs-num'>1</span><span class='hs-layout'>,</span> <span class='hs-varid'>const2</span> <span class='hs-num'>1</span><span class='hs-layout'>,</span> <span class='hs-varid'>cast</span><span class='hs-layout'>)</span>
<a name="line-206"></a> <span class='hs-keyword'>where</span>
<a name="line-207"></a> <span class='hs-sel'>_case</span> <span class='hs-varid'>cs</span> <span class='hs-varid'>el</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>sum</span> <span class='hs-layout'>(</span><span class='hs-varid'>map</span> <span class='hs-layout'>(</span><span class='hs-varid'>uncurry</span> <span class='hs-layout'>(</span><span class='hs-varop'>+</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <span class='hs-varid'>cs</span><span class='hs-layout'>)</span> <span class='hs-varop'>+</span> <span class='hs-varid'>el</span>
<a name="line-208"></a> <span class='hs-varid'>list</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>sum</span>
<a name="line-209"></a> <span class='hs-varid'>const2</span> <span class='hs-varid'>a</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>a</span>
<a name="line-210"></a> <span class='hs-varid'>binary</span> <span class='hs-keyword'>_</span> <span class='hs-varid'>x</span> <span class='hs-varid'>y</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>x</span> <span class='hs-varop'>+</span> <span class='hs-varid'>y</span>
<a name="line-211"></a> <span class='hs-varid'>unary</span> <span class='hs-keyword'>_</span> <span class='hs-varid'>x</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>x</span>
<a name="line-212"></a> <span class='hs-varid'>aggr</span> <span class='hs-keyword'>_</span> <span class='hs-varid'>x</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>x</span>
<a name="line-213"></a> <span class='hs-varid'>cast</span> <span class='hs-keyword'>_</span> <span class='hs-varid'>n</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>n</span>
<a name="line-214"></a>
<a name="line-215"></a><a name="isAggregate"></a><span class='hs-definition'>isAggregate</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>PrimExpr</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Bool</span>
<a name="line-216"></a><span class='hs-definition'>isAggregate</span> <span class='hs-varid'>x</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>countAggregate</span> <span class='hs-varid'>x</span> <span class='hs-varop'>></span> <span class='hs-num'>0</span>
<a name="line-217"></a>
<a name="line-218"></a><a name="countAggregate"></a><span class='hs-definition'>countAggregate</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>PrimExpr</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Int</span>
<a name="line-219"></a><span class='hs-definition'>countAggregate</span>
<a name="line-220"></a> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>foldPrimExpr</span> <span class='hs-layout'>(</span><span class='hs-varid'>const</span> <span class='hs-num'>0</span><span class='hs-layout'>,</span> <span class='hs-varid'>const</span> <span class='hs-num'>0</span><span class='hs-layout'>,</span> <span class='hs-varid'>binary</span><span class='hs-layout'>,</span> <span class='hs-varid'>unary</span><span class='hs-layout'>,</span> <span class='hs-varid'>aggr</span><span class='hs-layout'>,</span> <span class='hs-sel'>_case</span><span class='hs-layout'>,</span> <span class='hs-varid'>list</span><span class='hs-layout'>,</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>\</span><span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-num'>0</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>\</span><span class='hs-keyword'>_</span> <span class='hs-varid'>n</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>sum</span> <span class='hs-varid'>n</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-varid'>cast</span><span class='hs-layout'>)</span>
<a name="line-221"></a> <span class='hs-keyword'>where</span>
<a name="line-222"></a> <span class='hs-varid'>binary</span> <span class='hs-varid'>op</span> <span class='hs-varid'>x</span> <span class='hs-varid'>y</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>x</span> <span class='hs-varop'>+</span> <span class='hs-varid'>y</span>
<a name="line-223"></a> <span class='hs-varid'>unary</span> <span class='hs-varid'>op</span> <span class='hs-varid'>x</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>x</span>
<a name="line-224"></a> <span class='hs-varid'>aggr</span> <span class='hs-varid'>op</span> <span class='hs-varid'>x</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>x</span> <span class='hs-varop'>+</span> <span class='hs-num'>1</span>
<a name="line-225"></a> <span class='hs-sel'>_case</span> <span class='hs-varid'>cs</span> <span class='hs-varid'>el</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>sum</span> <span class='hs-layout'>(</span><span class='hs-varid'>map</span> <span class='hs-layout'>(</span><span class='hs-varid'>uncurry</span> <span class='hs-layout'>(</span><span class='hs-varop'>+</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <span class='hs-varid'>cs</span><span class='hs-layout'>)</span> <span class='hs-varop'>+</span> <span class='hs-varid'>el</span>
<a name="line-226"></a> <span class='hs-varid'>list</span> <span class='hs-varid'>xs</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>sum</span> <span class='hs-varid'>xs</span>
<a name="line-227"></a> <span class='hs-varid'>cast</span> <span class='hs-keyword'>_</span> <span class='hs-varid'>e</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>e</span>
<a name="line-228"></a>
<a name="line-229"></a><a name="foldPrimQuery"></a><span class='hs-comment'>-- | Fold on 'PrimQuery'</span>
<a name="line-230"></a><span class='hs-definition'>foldPrimQuery</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-varid'>t</span><span class='hs-layout'>,</span> <span class='hs-conid'>TableName</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Scheme</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>t</span><span class='hs-layout'>,</span> <span class='hs-conid'>Assoc</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>t</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>t</span><span class='hs-layout'>,</span>
<a name="line-231"></a> <span class='hs-conid'>PrimExpr</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>t</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>t</span><span class='hs-layout'>,</span> <span class='hs-conid'>RelOp</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>t</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>t</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>t</span><span class='hs-layout'>,</span>
<a name="line-232"></a> <span class='hs-conid'>Assoc</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>t</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>t</span><span class='hs-layout'>,</span> <span class='hs-conid'>SpecialOp</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>t</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>t</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>PrimQuery</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>t</span>
<a name="line-233"></a><span class='hs-definition'>foldPrimQuery</span> <span class='hs-layout'>(</span><span class='hs-varid'>empty</span><span class='hs-layout'>,</span><span class='hs-varid'>table</span><span class='hs-layout'>,</span><span class='hs-varid'>project</span><span class='hs-layout'>,</span><span class='hs-varid'>restrict</span><span class='hs-layout'>,</span><span class='hs-varid'>binary</span><span class='hs-layout'>,</span><span class='hs-varid'>group</span><span class='hs-layout'>,</span><span class='hs-varid'>special</span><span class='hs-layout'>)</span>
<a name="line-234"></a> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>fold</span>
<a name="line-235"></a> <span class='hs-keyword'>where</span>
<a name="line-236"></a> <span class='hs-varid'>fold</span> <span class='hs-layout'>(</span><span class='hs-conid'>Empty</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>empty</span>
<a name="line-237"></a> <span class='hs-varid'>fold</span> <span class='hs-layout'>(</span><span class='hs-conid'>BaseTable</span> <span class='hs-varid'>name</span> <span class='hs-varid'>schema</span><span class='hs-layout'>)</span>
<a name="line-238"></a> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>table</span> <span class='hs-varid'>name</span> <span class='hs-varid'>schema</span>
<a name="line-239"></a> <span class='hs-varid'>fold</span> <span class='hs-layout'>(</span><span class='hs-conid'>Project</span> <span class='hs-varid'>assoc</span> <span class='hs-varid'>query</span><span class='hs-layout'>)</span>
<a name="line-240"></a> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>project</span> <span class='hs-varid'>assoc</span> <span class='hs-layout'>(</span><span class='hs-varid'>fold</span> <span class='hs-varid'>query</span><span class='hs-layout'>)</span>
<a name="line-241"></a> <span class='hs-varid'>fold</span> <span class='hs-layout'>(</span><span class='hs-conid'>Restrict</span> <span class='hs-varid'>expr</span> <span class='hs-varid'>query</span><span class='hs-layout'>)</span>
<a name="line-242"></a> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>restrict</span> <span class='hs-varid'>expr</span> <span class='hs-layout'>(</span><span class='hs-varid'>fold</span> <span class='hs-varid'>query</span><span class='hs-layout'>)</span>
<a name="line-243"></a> <span class='hs-varid'>fold</span> <span class='hs-layout'>(</span><span class='hs-conid'>Binary</span> <span class='hs-varid'>op</span> <span class='hs-varid'>query1</span> <span class='hs-varid'>query2</span><span class='hs-layout'>)</span>
<a name="line-244"></a> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>binary</span> <span class='hs-varid'>op</span> <span class='hs-layout'>(</span><span class='hs-varid'>fold</span> <span class='hs-varid'>query1</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>fold</span> <span class='hs-varid'>query2</span><span class='hs-layout'>)</span>
<a name="line-245"></a> <span class='hs-varid'>fold</span> <span class='hs-layout'>(</span><span class='hs-conid'>Group</span> <span class='hs-varid'>assocs</span> <span class='hs-varid'>query</span><span class='hs-layout'>)</span>
<a name="line-246"></a> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>group</span> <span class='hs-varid'>assocs</span> <span class='hs-layout'>(</span><span class='hs-varid'>fold</span> <span class='hs-varid'>query</span><span class='hs-layout'>)</span>
<a name="line-247"></a> <span class='hs-varid'>fold</span> <span class='hs-layout'>(</span><span class='hs-conid'>Special</span> <span class='hs-varid'>op</span> <span class='hs-varid'>query</span><span class='hs-layout'>)</span>
<a name="line-248"></a> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>special</span> <span class='hs-varid'>op</span> <span class='hs-layout'>(</span><span class='hs-varid'>fold</span> <span class='hs-varid'>query</span><span class='hs-layout'>)</span>
<a name="line-249"></a><a name="foldPrimExpr"></a><span class='hs-comment'>-- | Fold on 'PrimExpr'</span>
<a name="line-250"></a><span class='hs-definition'>foldPrimExpr</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>Attribute</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>t</span><span class='hs-layout'>,</span> <span class='hs-conid'>Literal</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>t</span><span class='hs-layout'>,</span> <span class='hs-conid'>BinOp</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>t</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>t</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>t</span><span class='hs-layout'>,</span>
<a name="line-251"></a> <span class='hs-conid'>UnOp</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>t</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>t</span><span class='hs-layout'>,</span> <span class='hs-conid'>AggrOp</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>t</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>t</span><span class='hs-layout'>,</span>
<a name="line-252"></a> <span class='hs-keyglyph'>[</span><span class='hs-layout'>(</span><span class='hs-varid'>t</span><span class='hs-layout'>,</span><span class='hs-varid'>t</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>t</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>t</span><span class='hs-layout'>,</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>t</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>t</span><span class='hs-layout'>,</span> <span class='hs-conid'>Maybe</span> <span class='hs-conid'>Name</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>t</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>t</span><span class='hs-layout'>,</span> <span class='hs-conid'>Name</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>t</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>t</span><span class='hs-layout'>,</span> <span class='hs-conid'>Name</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>t</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>t</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>PrimExpr</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>t</span>
<a name="line-253"></a><span class='hs-definition'>foldPrimExpr</span> <span class='hs-layout'>(</span><span class='hs-varid'>attr</span><span class='hs-layout'>,</span><span class='hs-varid'>scalar</span><span class='hs-layout'>,</span><span class='hs-varid'>binary</span><span class='hs-layout'>,</span><span class='hs-varid'>unary</span><span class='hs-layout'>,</span><span class='hs-varid'>aggr</span><span class='hs-layout'>,</span><span class='hs-sel'>_case</span><span class='hs-layout'>,</span><span class='hs-varid'>list</span><span class='hs-layout'>,</span><span class='hs-varid'>param</span><span class='hs-layout'>,</span><span class='hs-varid'>fun</span><span class='hs-layout'>,</span><span class='hs-varid'>cast</span><span class='hs-layout'>)</span>
<a name="line-254"></a> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>fold</span>
<a name="line-255"></a> <span class='hs-keyword'>where</span>
<a name="line-256"></a> <span class='hs-varid'>fold</span> <span class='hs-layout'>(</span><span class='hs-conid'>AttrExpr</span> <span class='hs-varid'>name</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>attr</span> <span class='hs-varid'>name</span>
<a name="line-257"></a> <span class='hs-varid'>fold</span> <span class='hs-layout'>(</span><span class='hs-conid'>ConstExpr</span> <span class='hs-varid'>s</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>scalar</span> <span class='hs-varid'>s</span>
<a name="line-258"></a> <span class='hs-varid'>fold</span> <span class='hs-layout'>(</span><span class='hs-conid'>BinExpr</span> <span class='hs-varid'>op</span> <span class='hs-varid'>x</span> <span class='hs-varid'>y</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>=</span> <span class='hs-varid'>binary</span> <span class='hs-varid'>op</span> <span class='hs-layout'>(</span><span class='hs-varid'>fold</span> <span class='hs-varid'>x</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>fold</span> <span class='hs-varid'>y</span><span class='hs-layout'>)</span>
<a name="line-259"></a> <span class='hs-varid'>fold</span> <span class='hs-layout'>(</span><span class='hs-conid'>UnExpr</span> <span class='hs-varid'>op</span> <span class='hs-varid'>x</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>unary</span> <span class='hs-varid'>op</span> <span class='hs-layout'>(</span><span class='hs-varid'>fold</span> <span class='hs-varid'>x</span><span class='hs-layout'>)</span>
<a name="line-260"></a> <span class='hs-varid'>fold</span> <span class='hs-layout'>(</span><span class='hs-conid'>AggrExpr</span> <span class='hs-varid'>op</span> <span class='hs-varid'>x</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>aggr</span> <span class='hs-varid'>op</span> <span class='hs-layout'>(</span><span class='hs-varid'>fold</span> <span class='hs-varid'>x</span><span class='hs-layout'>)</span>
<a name="line-261"></a> <span class='hs-varid'>fold</span> <span class='hs-layout'>(</span><span class='hs-conid'>CaseExpr</span> <span class='hs-varid'>cs</span> <span class='hs-varid'>el</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-sel'>_case</span> <span class='hs-layout'>(</span><span class='hs-varid'>map</span> <span class='hs-layout'>(</span><span class='hs-varid'>both</span> <span class='hs-varid'>fold</span><span class='hs-layout'>)</span> <span class='hs-varid'>cs</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>fold</span> <span class='hs-varid'>el</span><span class='hs-layout'>)</span>
<a name="line-262"></a> <span class='hs-varid'>fold</span> <span class='hs-layout'>(</span><span class='hs-conid'>ListExpr</span> <span class='hs-varid'>xs</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>list</span> <span class='hs-layout'>(</span><span class='hs-varid'>map</span> <span class='hs-varid'>fold</span> <span class='hs-varid'>xs</span><span class='hs-layout'>)</span>
<a name="line-263"></a> <span class='hs-varid'>fold</span> <span class='hs-layout'>(</span><span class='hs-conid'>ParamExpr</span> <span class='hs-varid'>n</span> <span class='hs-varid'>value</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>param</span> <span class='hs-varid'>n</span> <span class='hs-layout'>(</span><span class='hs-varid'>fold</span> <span class='hs-varid'>value</span><span class='hs-layout'>)</span>
<a name="line-264"></a> <span class='hs-varid'>fold</span> <span class='hs-layout'>(</span><span class='hs-conid'>FunExpr</span> <span class='hs-varid'>n</span> <span class='hs-varid'>exprs</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>fun</span> <span class='hs-varid'>n</span> <span class='hs-layout'>(</span><span class='hs-varid'>map</span> <span class='hs-varid'>fold</span> <span class='hs-varid'>exprs</span><span class='hs-layout'>)</span>
<a name="line-265"></a> <span class='hs-varid'>fold</span> <span class='hs-layout'>(</span><span class='hs-conid'>CastExpr</span> <span class='hs-varid'>n</span> <span class='hs-varid'>expr</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>cast</span> <span class='hs-varid'>n</span> <span class='hs-layout'>(</span><span class='hs-varid'>fold</span> <span class='hs-varid'>expr</span><span class='hs-layout'>)</span>
<a name="line-266"></a>
<a name="line-267"></a> <span class='hs-varid'>both</span> <span class='hs-varid'>f</span> <span class='hs-layout'>(</span><span class='hs-varid'>x</span><span class='hs-layout'>,</span><span class='hs-varid'>y</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-varid'>f</span> <span class='hs-varid'>x</span><span class='hs-layout'>,</span> <span class='hs-varid'>f</span> <span class='hs-varid'>y</span><span class='hs-layout'>)</span>
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