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Fix NULL handling in multi-batch Parallel Hash Left Join.
NULL keys in left joins were skipped when building batch files.
Repair, by making the keep_nulls argument to ExecHashGetHashValue()
depend on whether this is a left outer join, as we do in other
paths.
Bug #15475. Thinko in 1804284042
. Back-patch to 11.
Reported-by: Paul Schaap
Diagnosed-by: Andrew Gierth
Dicussion: https://postgr.es/m/15475-11a7a783fed72a36%40postgresql.org
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@ -1395,7 +1395,7 @@ ExecParallelHashJoinPartitionOuter(HashJoinState *hjstate)
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if (ExecHashGetHashValue(hashtable, econtext,
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hjstate->hj_OuterHashKeys,
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true, /* outer tuple */
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false, /* outer join, currently unsupported */
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HJ_FILL_OUTER(hjstate),
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&hashvalue))
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{
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int batchno;
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