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Introduce TupleHashTableHash() and LookupTupleHashEntryHash().

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Expose two new entry points: one for only calculating the hash value
of a tuple, and another for looking up a hash entry when the hash
value is already known. This will be useful for disk-based Hash
Aggregation to avoid recomputing the hash value for the same tuple
after saving and restoring it from disk.

Discussion: https://postgr.es/m/37091115219dd522fd9ed67333ee8ed1b7e09443.camel%40j-davis.com
This commit is contained in:
Jeff Davis
2020-02-06 19:39:47 -08:00
parent e6f86f8dd9
commit 4eaea3db15
2 changed files with 83 additions and 30 deletions
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5
src/include/executor/executor.h
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@ -140,6 +140,11 @@ extern TupleHashTable BuildTupleHashTableExt(PlanState *parent,
extern TupleHashEntry LookupTupleHashEntry(TupleHashTable hashtable,
TupleTableSlot *slot,
bool *isnew);
extern uint32 TupleHashTableHash(struct tuplehash_hash *tb,
const MinimalTuple tuple);
extern TupleHashEntry LookupTupleHashEntryHash(TupleHashTable hashtable,
TupleTableSlot *slot,
bool *isnew, uint32 hash);
extern TupleHashEntry FindTupleHashEntry(TupleHashTable hashtable,
TupleTableSlot *slot,
ExprState *eqcomp,