Revert "Implement list comprehension (apache#1610)"

This reverts commit 3b2b394.

Author: MuhammadTahaNaveed

Makefile

@@ -111,7 +111,6 @@ REGRESS = scan \
           graph_generation \
           name_validation \
           jsonb_operators \
-          list_comprehension \
           map_projection
 
 ifneq ($(EXTRA_TESTS),)

regress/expected/list_comprehension.out

@@ -181,8 +181,7 @@ CREATE FUNCTION ag_catalog.age_range(variadic "any")
 PARALLEL SAFE
 AS 'MODULE_PATHNAME';
 
-CREATE FUNCTION ag_catalog.age_unnest(agtype,
-                                      list_comprehension boolean = false)
+CREATE FUNCTION ag_catalog.age_unnest(agtype)
     RETURNS SETOF agtype
 LANGUAGE c
 IMMUTABLE

regress/sql/list_comprehension.sql

@@ -176,7 +176,6 @@ void out_cypher_unwind(StringInfo str, const ExtensibleNode *node)
     DEFINE_AG_NODE(cypher_unwind);
 
     WRITE_NODE_FIELD(target);
-    WRITE_NODE_FIELD(collect);
 }
 
 /* serialization function for the cypher_delete ExtensibleNode. */

sql/agtype_typecast.sql

@@ -932,13 +932,6 @@ bool expr_contains_node(cypher_expression_condition is_expr, Node *expr)
         }
         if (is_ag_node(expr, cypher_unwind))
         {
-            cypher_unwind* lc = (cypher_unwind *)expr;
-
-            if (expr_contains_node(is_expr, lc->where) ||
-                expr_contains_node(is_expr, lc->collect))
-            {
-                return true;
-            }
             break;
         }