Function ExecInitRangeTable

src/backend/executor/execUtils.c:807–830

* ExecInitRangeTable * Set up executor's range-table-related data * * In addition to the range table proper, initialize arrays that are * indexed by rangetable index. */

 * indexed by rangetable index.
 */
void
ExecInitRangeTable(EState *estate, List *rangeTable)
{
	/* Remember the range table List as-is */
	estate->es_range_table = rangeTable;

	/* Set size of associated arrays */
	estate->es_range_table_size = list_length(rangeTable);

	/*
	 * Allocate an array to store an open Relation corresponding to each
	 * rangetable entry, and initialize entries to NULL.  Relations are opened
	 * and stored here as needed.
	 */
	estate->es_relations = (Relation *)
		palloc0(estate->es_range_table_size * sizeof(Relation));

	/*
	 * es_result_relations and es_rowmarks are also parallel to
	 * es_range_table, but are allocated only if needed.
	 */
	estate->es_result_relations = NULL;
	estate->es_rowmarks = NULL;
}

/*
 * ExecGetRangeTableRelation