Function finalize_grouping_exprs

src/backend/parser/parse_agg.c:1546–1563

* finalize_grouping_exprs - * Scan the given expression tree for GROUPING() and related calls, * and validate and process their arguments. * * This is split out from check_ungrouped_columns above because it needs * to modify the nodes (which it does in-place, not via a mutator) while * check_ungrouped_columns may see only a copy of the original thanks to * flattening of join alias vars.

 * GROUPING argument as we see it before comparing it.
 */
static void
finalize_grouping_exprs(Node *node, ParseState *pstate, Query *qry,
						List *groupClauses, bool hasJoinRTEs,
						bool have_non_var_grouping)
{
	check_ungrouped_columns_context context;

	context.pstate = pstate;
	context.qry = qry;
	context.hasJoinRTEs = hasJoinRTEs;
	context.groupClauses = groupClauses;
	context.groupClauseCommonVars = NIL;
	context.have_non_var_grouping = have_non_var_grouping;
	context.func_grouped_rels = NULL;
	context.sublevels_up = 0;
	context.in_agg_direct_args = false;
	finalize_grouping_exprs_walker(node, &context);
}

static bool
finalize_grouping_exprs_walker(Node *node,