Function ExecMaterialMarkPos

src/backend/executor/nodeMaterial.c:384–404

---------------------------------------------------------------- * ExecMaterialMarkPos * * Calls tuplestore to save the current position in the stored file. * ---------------------------------------------------------------- */

 * ----------------------------------------------------------------
 */
void
ExecMaterialMarkPos(MaterialState *node)
{
	Assert(node->eflags & EXEC_FLAG_MARK);

	/*
	 * if we haven't materialized yet, just return.
	 */
	if (!node->tuplestorestate)
		return;

	/*
	 * copy the active read pointer to the mark.
	 */
	tuplestore_copy_read_pointer(node->tuplestorestate, 0, 1);

	/*
	 * since we may have advanced the mark, try to truncate the tuplestore.
	 */
	tuplestore_trim(node->tuplestorestate);
}

/* ----------------------------------------------------------------
 *		ExecMaterialRestrPos