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Reuse abbreviated keys in ordered [set] aggregates.

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When processing ordered aggregates following a sort that could make use
of the abbreviated key optimization, only call the equality operator to
compare successive pairs of tuples when their abbreviated keys were not
equal.

Peter Geoghegan, reviewd by Andreas Karlsson and by me.
This commit is contained in:
Robert Haas
2016-02-17 15:40:00 +05:30
parent 66f503868b
commit f1f5ec1efa
6 changed files with 92 additions and 39 deletions
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4
src/include/utils/tuplesort.h
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@@ -93,13 +93,13 @@ extern void tuplesort_putdatum(Tuplesortstate *state, Datum val,
extern void tuplesort_performsort(Tuplesortstate *state);
extern bool tuplesort_gettupleslot(Tuplesortstate *state, bool forward,
TupleTableSlot *slot);
TupleTableSlot *slot, Datum *abbrev);
extern HeapTuple tuplesort_getheaptuple(Tuplesortstate *state, bool forward,
bool *should_free);
extern IndexTuple tuplesort_getindextuple(Tuplesortstate *state, bool forward,
bool *should_free);
extern bool tuplesort_getdatum(Tuplesortstate *state, bool forward,
Datum *val, bool *isNull);
Datum *val, bool *isNull, Datum *abbrev);
extern bool tuplesort_skiptuples(Tuplesortstate *state, int64 ntuples,
bool forward);