ChainTail	crates/gravity/lowerv4/src/ops/hashjoin/spill/build.rs	alone	lifetime	D4055	an op other than a filter, projection or the full sort's step after the probe keeps its build resident	hash join	A hash join whose rows go on in the same pipeline into another join or into a step other than a filter or projection (for example every join but the last in a chain of hash joins) keeps its whole hash table in memory where PostgreSQL would spill it to disk, so the statement fails with an out-of-memory error when the server has no more memory to give it.
