Function ExecSquelchMaterial

src/backend/executor/nodeMaterial.c:530–548

}

void
ExecSquelchMaterial(MaterialState *node, bool force)
{
	/*
	 * If this Material is shielding the underlying nodes from rescanning (for
	 * example, if there is a Motion node below), then keep the tuplestore.
	 * Also, don't recurse to the subtree in that case, because we might need
	 * to read more tuples from it after a ReScan. Most likely we have already
	 * read all the tuples from the underlying node in that case, but it's
	 * possible that ExecMaterial hasn't been called even once yet, and we
	 * haven't created the tuplestore yet.
	 */
	if (!node->ss.ps.squelched && (!node->delayEagerFree || force))
	{
		ExecEagerFreeMaterial(node);
		node->ss.ps.squelched = true;
		ExecSquelchNode(outerPlanState(node), force);
	}
}