Function SpillCurrentBatch

src/backend/executor/nodeHashjoin.c:1863–1888

* In our hybrid hash join we either spill when we increase number of batches * or when we re-spill. As we go, we normally destroy the batch file of the * batch that we have already processed. But if we need to support re-scanning * of the outer tuples, without also re-scanning the inner side, we need to * save the current hash for the next re-scan, instead. */

 * save the current hash for the next re-scan, instead.
 */
static void
SpillCurrentBatch(HashJoinState *node)
{
	HashJoinTable hashtable = node->hj_HashTable;
	int			curbatch = hashtable->curbatch;
	HashJoinTuple tuple;
	int			i;

	Assert(hashtable->innerBatchFile[curbatch] == NULL);

	for (i = 0; i < hashtable->nbuckets; i++)
	{
		/* don't need to consider parallel hashjoins which use shared tuplestores instead of raw files */
		tuple = hashtable->buckets.unshared[i];

		while (tuple != NULL)
		{
			ExecHashJoinSaveTuple(NULL, HJTUPLE_MINTUPLE(tuple),
								  tuple->hashvalue,
								  hashtable,
								  &hashtable->innerBatchFile[curbatch],
								  hashtable->bfCxt);
			tuple = tuple->next.unshared;
		}
	}
}

static bool
ExecHashJoinReloadHashTable(HashJoinState *hjstate)