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Add combine functions for various floating-point aggregates.

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This allows parallel aggregation to use them.  It may seem surprising
that we use float8_combine for both float4_accum and float8_accum
transition functions, but that's because those functions differ only
in the type of the non-transition-state argument.

Haribabu Kommi, reviewed by David Rowley and Tomas Vondra
This commit is contained in:
Robert Haas
2016-04-08 13:44:50 -04:00
parent 38627f6878
commit af025eed53
5 changed files with 159 additions and 46 deletions
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107
src/backend/utils/adt/float.c
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@@ -2435,6 +2435,50 @@ check_float8_array(ArrayType *transarray, const char *caller, int n)
return (float8 *) ARR_DATA_PTR(transarray);
}
/*
* float8_combine
*
* An aggregate combine function used to combine two 3 fields
* aggregate transition data into a single transition data.
* This function is used only in two stage aggregation and
* shouldn't be called outside aggregate context.
*/
Datum
float8_combine(PG_FUNCTION_ARGS)
{
ArrayType *transarray1 = PG_GETARG_ARRAYTYPE_P(0);
ArrayType *transarray2 = PG_GETARG_ARRAYTYPE_P(1);
float8 *transvalues1;
float8 *transvalues2;
float8 N,
sumX,
sumX2;
if (!AggCheckCallContext(fcinfo, NULL))
elog(ERROR, "aggregate function called in non-aggregate context");
transvalues1 = check_float8_array(transarray1, "float8_combine", 3);
N = transvalues1[0];
sumX = transvalues1[1];
sumX2 = transvalues1[2];
transvalues2 = check_float8_array(transarray2, "float8_combine", 3);
N += transvalues2[0];
sumX += transvalues2[1];
CHECKFLOATVAL(sumX, isinf(transvalues1[1]) || isinf(transvalues2[1]),
true);
sumX2 += transvalues2[2];
CHECKFLOATVAL(sumX2, isinf(transvalues1[2]) || isinf(transvalues2[2]),
true);
transvalues1[0] = N;
transvalues1[1] = sumX;
transvalues1[2] = sumX2;
PG_RETURN_ARRAYTYPE_P(transarray1);
}
Datum
float8_accum(PG_FUNCTION_ARGS)
{
@@ -2762,6 +2806,69 @@ float8_regr_accum(PG_FUNCTION_ARGS)
}
}
/*
* float8_regr_combine
*
* An aggregate combine function used to combine two 6 fields
* aggregate transition data into a single transition data.
* This function is used only in two stage aggregation and
* shouldn't be called outside aggregate context.
*/
Datum
float8_regr_combine(PG_FUNCTION_ARGS)
{
ArrayType *transarray1 = PG_GETARG_ARRAYTYPE_P(0);
ArrayType *transarray2 = PG_GETARG_ARRAYTYPE_P(1);
float8 *transvalues1;
float8 *transvalues2;
float8 N,
sumX,
sumX2,
sumY,
sumY2,
sumXY;
if (!AggCheckCallContext(fcinfo, NULL))
elog(ERROR, "aggregate function called in non-aggregate context");
transvalues1 = check_float8_array(transarray1, "float8_regr_combine", 6);
N = transvalues1[0];
sumX = transvalues1[1];
sumX2 = transvalues1[2];
sumY = transvalues1[3];
sumY2 = transvalues1[4];
sumXY = transvalues1[5];
transvalues2 = check_float8_array(transarray2, "float8_regr_combine", 6);
N += transvalues2[0];
sumX += transvalues2[1];
CHECKFLOATVAL(sumX, isinf(transvalues1[1]) || isinf(transvalues2[1]),
true);
sumX2 += transvalues2[2];
CHECKFLOATVAL(sumX2, isinf(transvalues1[2]) || isinf(transvalues2[2]),
true);
sumY += transvalues2[3];
CHECKFLOATVAL(sumY, isinf(transvalues1[3]) || isinf(transvalues2[3]),
true);
sumY2 += transvalues2[4];
CHECKFLOATVAL(sumY2, isinf(transvalues1[4]) || isinf(transvalues2[4]),
true);
sumXY += transvalues2[5];
CHECKFLOATVAL(sumXY, isinf(transvalues1[5]) || isinf(transvalues2[5]),
true);
transvalues1[0] = N;
transvalues1[1] = sumX;
transvalues1[2] = sumX2;
transvalues1[3] = sumY;
transvalues1[4] = sumY2;
transvalues1[5] = sumXY;
PG_RETURN_ARRAYTYPE_P(transarray1);
}
Datum
float8_regr_sxx(PG_FUNCTION_ARGS)
{