Function assign_query_collations

src/backend/parser/parse_collate.c:100–114

* assign_query_collations() * Mark all expressions in the given Query with collation information. * * This should be applied to each Query after completion of parse analysis * for expressions. Note that we do not recurse into sub-Queries, since * those should have been processed when built. */

 * those should have been processed when built.
 */
void
assign_query_collations(ParseState *pstate, Query *query)
{
	/*
	 * We just use query_tree_walker() to visit all the contained expressions.
	 * We can skip the rangetable and CTE subqueries, though, since RTEs and
	 * subqueries had better have been processed already (else Vars referring
	 * to them would not get created with the right collation).
	 */
	(void) query_tree_walker(query,
							 assign_query_collations_walker,
							 (void *) pstate,
							 QTW_IGNORE_RANGE_TABLE |
							 QTW_IGNORE_CTE_SUBQUERIES);
}

/*
 * Walker for assign_query_collations