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Do execGrouping.c via expression eval machinery.

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This has a performance benefit on own, although not hugely so. The
primary benefit is that it will allow for to JIT tuple deforming and
comparator invocations.

Author: Andres Freund
Discussion: https://postgr.es/m/20171129080934.amqqkke2zjtekd4t@alap3.anarazel.de
This commit is contained in:
Andres Freund
2018-02-15 21:55:31 -08:00
parent 51db0d18fb
commit 773aec7aa9
15 changed files with 498 additions and 366 deletions
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12
src/include/executor/nodeAgg.h
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@ -102,11 +102,12 @@ typedef struct AggStatePerTransData
bool *sortNullsFirst;
/*
* fmgr lookup data for input columns' equality operators --- only
* set/used when aggregate has DISTINCT flag. Note that these are in
* order of sort column index, not parameter index.
* Comparators for input columns --- only set/used when aggregate has
* DISTINCT flag. equalfnOne version is used for single-column
* commparisons, equalfnMulti for the case of multiple columns.
*/
FmgrInfo *equalfns; /* array of length numDistinctCols */
FmgrInfo equalfnOne;
ExprState *equalfnMulti;
/*
* initial value from pg_aggregate entry
@ -270,7 +271,8 @@ typedef struct AggStatePerPhaseData
int numsets; /* number of grouping sets (or 0) */
int *gset_lengths; /* lengths of grouping sets */
Bitmapset **grouped_cols; /* column groupings for rollup */
FmgrInfo *eqfunctions; /* per-grouping-field equality fns */
ExprState **eqfunctions; /* expression returning equality, indexed by
* nr of cols to compare */
Agg *aggnode; /* Agg node for phase data */
Sort *sortnode; /* Sort node for input ordering for phase */