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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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14
src/include/utils/numeric.h
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@ -5,7 +5,7 @@
*
* 1998 Jan Wieck
*
* $Header: /cvsroot/pgsql/src/include/utils/numeric.h,v 1.10 2000/06/13 07:35:31 tgl Exp $
* $Header: /cvsroot/pgsql/src/include/utils/numeric.h,v 1.11 2000/07/17 03:05:32 tgl Exp $
*
* ----------
*/
@ -55,7 +55,7 @@
* all leading and trailing zeroes (except there will be a trailing zero
* in the last byte, if the number of digits is odd). In particular,
* if the value is zero, there will be no digits at all! The weight is
* arbitrary in this case, but we normally set it to zero.
* arbitrary in that case, but we normally set it to zero.
* ----------
*/
typedef struct NumericData
@ -75,9 +75,11 @@ typedef NumericData *Numeric;
* fmgr interface macros
*/
#define DatumGetNumeric(X) ((Numeric) PG_DETOAST_DATUM(X))
#define NumericGetDatum(X) PointerGetDatum(X)
#define PG_GETARG_NUMERIC(n) DatumGetNumeric(PG_GETARG_DATUM(n))
#define PG_RETURN_NUMERIC(x) return NumericGetDatum(x)
#define DatumGetNumeric(X) ((Numeric) PG_DETOAST_DATUM(X))
#define DatumGetNumericCopy(X) ((Numeric) PG_DETOAST_DATUM_COPY(X))
#define NumericGetDatum(X) PointerGetDatum(X)
#define PG_GETARG_NUMERIC(n) DatumGetNumeric(PG_GETARG_DATUM(n))
#define PG_GETARG_NUMERIC_COPY(n) DatumGetNumericCopy(PG_GETARG_DATUM(n))
#define PG_RETURN_NUMERIC(x) return NumericGetDatum(x)
#endif /* _PG_NUMERIC_H_ */