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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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29
src/include/utils/array.h
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@ -11,7 +11,7 @@
* Portions Copyright (c) 1996-2000, PostgreSQL, Inc
* Portions Copyright (c) 1994, Regents of the University of California
*
* $Id: array.h,v 1.25 2000/06/13 07:35:30 tgl Exp $
* $Id: array.h,v 1.26 2000/07/17 03:05:32 tgl Exp $
*
* NOTES
* XXX the data array should be MAXALIGN'd -- notice that the array
@ -24,15 +24,27 @@
#define ARRAY_H
#include "fmgr.h"
#include "utils/memutils.h"
/*
* Arrays are varlena objects, so must meet the varlena convention that
* the first int32 of the object contains the total object size in bytes.
*/
typedef struct
{
int size; /* total array size (in bytes) */
int32 size; /* total array size (varlena requirement) */
int ndim; /* # of dimensions */
int flags; /* implementation flags */
} ArrayType;
/*
* fmgr macros for array objects
*/
#define DatumGetArrayTypeP(X) ((ArrayType *) PG_DETOAST_DATUM(X))
#define DatumGetArrayTypePCopy(X) ((ArrayType *) PG_DETOAST_DATUM_COPY(X))
#define PG_GETARG_ARRAYTYPE_P(n) DatumGetArrayTypeP(PG_GETARG_DATUM(n))
#define PG_GETARG_ARRAYTYPE_P_COPY(n) DatumGetArrayTypePCopy(PG_GETARG_DATUM(n))
#define PG_RETURN_ARRAYTYPE_P(x) PG_RETURN_POINTER(x)
/*
* bitmask of ArrayType flags field:
* 1st bit - large object flag
@ -43,11 +55,9 @@ typedef struct
#define ARR_CHK_FLAG (0x2)
#define ARR_OBJ_MASK (0x1c)
#define ARR_FLAGS(a) ((ArrayType *) a)->flags
#define ARR_SIZE(a) (((ArrayType *) a)->size)
#define ARR_NDIM(a) (((ArrayType *) a)->ndim)
#define ARR_NDIM_PTR(a) (&(((ArrayType *) a)->ndim))
#define ARR_FLAGS(a) (((ArrayType *) a)->flags)
#define ARR_IS_LO(a) \
(((ArrayType *) a)->flags & ARR_LOB_FLAG)
@ -102,7 +112,6 @@ typedef struct
#define RETURN_NULL(type) do { *isNull = true; return (type) 0; } while (0)
#define NAME_LEN 30
#define MAX_BUFF_SIZE BLCKSZ
typedef struct
{
@ -134,6 +143,12 @@ extern ArrayType *array_assgn(ArrayType *array, int nSubscripts,
bool elmbyval, int elmlen, bool *isNull);
extern Datum array_map(FunctionCallInfo fcinfo, Oid inpType, Oid retType);
extern ArrayType *construct_array(Datum *elems, int nelems,
bool elmbyval, int elmlen, char elmalign);
extern void deconstruct_array(ArrayType *array,
bool elmbyval, int elmlen, char elmalign,
Datum **elemsp, int *nelemsp);
extern int _LOtransfer(char **destfd, int size, int nitems, char **srcfd,
int isSrcLO, int isDestLO);
extern char *_array_newLO(int *fd, int flag);