/usr/share/postgresql/10/extension/citus--6.1-3--6.1-4.sql is in postgresql-10-citus 7.0.3.PGDG-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 | /* citus--6.1-3--6.1-4.sql */
SET search_path = 'pg_catalog';
CREATE FUNCTION column_to_column_name(table_name regclass, column_var_text text)
RETURNS text
LANGUAGE C STRICT
AS 'MODULE_PATHNAME', $$column_to_column_name$$;
COMMENT ON FUNCTION column_to_column_name(table_name regclass, column_var_text text)
IS 'convert the textual Var representation to a column name';
RESET search_path;
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