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Revise aggregate functions per earlier discussions in pghackers.

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There's now only one transition value and transition function.
NULL handling in aggregates is a lot cleaner.  Also, use Numeric
accumulators instead of integer accumulators for sum/avg on integer
datatypes --- this avoids overflow at the cost of being a little slower.
Implement VARIANCE() and STDDEV() aggregates in the standard backend.

Also, enable new LIKE selectivity estimators by default.  Unrelated
change, but as long as I had to force initdb anyway...
This commit is contained in:
Tom Lane
2000-07-17 03:05:41 +00:00
parent 139f19c302
commit bec98a31c5
55 changed files with 1949 additions and 1813 deletions
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27
src/include/utils/builtins.h
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@ -7,7 +7,7 @@
* Portions Copyright (c) 1996-2000, PostgreSQL, Inc
* Portions Copyright (c) 1994, Regents of the University of California
*
* $Id: builtins.h,v 1.123 2000/07/09 21:30:21 petere Exp $
* $Id: builtins.h,v 1.124 2000/07/17 03:05:32 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -110,7 +110,6 @@ extern Datum int2mi(PG_FUNCTION_ARGS);
extern Datum int2mul(PG_FUNCTION_ARGS);
extern Datum int2div(PG_FUNCTION_ARGS);
extern Datum int2abs(PG_FUNCTION_ARGS);
extern Datum int2inc(PG_FUNCTION_ARGS);
extern Datum int24pl(PG_FUNCTION_ARGS);
extern Datum int24mi(PG_FUNCTION_ARGS);
extern Datum int24mul(PG_FUNCTION_ARGS);
@ -207,12 +206,10 @@ extern float32 float4pl(float32 arg1, float32 arg2);
extern float32 float4mi(float32 arg1, float32 arg2);
extern float32 float4mul(float32 arg1, float32 arg2);
extern float32 float4div(float32 arg1, float32 arg2);
extern float32 float4inc(float32 arg1);
extern float64 float8pl(float64 arg1, float64 arg2);
extern float64 float8mi(float64 arg1, float64 arg2);
extern float64 float8mul(float64 arg1, float64 arg2);
extern float64 float8div(float64 arg1, float64 arg2);
extern float64 float8inc(float64 arg1);
extern bool float4eq(float32 arg1, float32 arg2);
extern bool float4ne(float32 arg1, float32 arg2);
extern bool float4lt(float32 arg1, float32 arg2);
@ -261,6 +258,11 @@ extern float64 radians(float64 arg1);
extern float64 dtan(float64 arg1);
extern float64 drandom(void);
extern int32 setseed(float64 seed);
extern Datum float8_accum(PG_FUNCTION_ARGS);
extern Datum float4_accum(PG_FUNCTION_ARGS);
extern Datum float8_avg(PG_FUNCTION_ARGS);
extern Datum float8_variance(PG_FUNCTION_ARGS);
extern Datum float8_stddev(PG_FUNCTION_ARGS);
extern float64 float48pl(float32 arg1, float64 arg2);
extern float64 float48mi(float32 arg1, float64 arg2);
@ -545,7 +547,6 @@ extern Numeric numeric_mul(Numeric num1, Numeric num2);
extern Numeric numeric_div(Numeric num1, Numeric num2);
extern Numeric numeric_mod(Numeric num1, Numeric num2);
extern Numeric numeric_inc(Numeric num);
extern Numeric numeric_dec(Numeric num);
extern Numeric numeric_smaller(Numeric num1, Numeric num2);
extern Numeric numeric_larger(Numeric num1, Numeric num2);
extern Numeric numeric_sqrt(Numeric num);
@ -555,14 +556,24 @@ extern Numeric numeric_log(Numeric num1, Numeric num2);
extern Numeric numeric_power(Numeric num1, Numeric num2);
extern Datum int4_numeric(PG_FUNCTION_ARGS);
extern int32 numeric_int4(Numeric num);
extern Numeric int8_numeric(int64 *val);
extern Datum int8_numeric(PG_FUNCTION_ARGS);
extern int64 *numeric_int8(Numeric num);
extern Datum int2_numeric(PG_FUNCTION_ARGS);
extern Datum numeric_int2(PG_FUNCTION_ARGS);
extern Numeric float4_numeric(float32 val);
extern float32 numeric_float4(Numeric num);
extern Numeric float8_numeric(float64 val);
extern float64 numeric_float8(Numeric num);
extern Numeric float4_numeric(float32 val);
extern float32 numeric_float4(Numeric num);
extern Datum numeric_accum(PG_FUNCTION_ARGS);
extern Datum int2_accum(PG_FUNCTION_ARGS);
extern Datum int4_accum(PG_FUNCTION_ARGS);
extern Datum int8_accum(PG_FUNCTION_ARGS);
extern Datum numeric_avg(PG_FUNCTION_ARGS);
extern Datum numeric_variance(PG_FUNCTION_ARGS);
extern Datum numeric_stddev(PG_FUNCTION_ARGS);
extern Datum int2_sum(PG_FUNCTION_ARGS);
extern Datum int4_sum(PG_FUNCTION_ARGS);
extern Datum int8_sum(PG_FUNCTION_ARGS);
/* lztext.c */
extern lztext *lztextin(char *str);