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Modify array operations to include array's element type OID in the

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array header, and to compute sizing and alignment of array elements
the same way normal tuple access operations do --- viz, using the
tupmacs.h macros att_addlength and att_align.  This makes the world
safe for arrays of cstrings or intervals, and should make it much
easier to write array-type-polymorphic functions; as examples see
the cleanups of array_out and contrib/array_iterator.  By Joe Conway
and Tom Lane.
This commit is contained in:
Tom Lane
2002-08-26 17:54:02 +00:00
parent 8009c27592
commit 5cabcfccce
38 changed files with 559 additions and 435 deletions
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34
src/include/utils/array.h
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@ -10,13 +10,7 @@
* Portions Copyright (c) 1996-2002, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $Id: array.h,v 1.32 2002/06/20 20:29:52 momjian Exp $
*
* NOTES
* XXX the data array should be MAXALIGN'd -- currently we only INTALIGN
* which is NOT good enough for, eg, arrays of Interval. Changing this
* will break existing user tables so hold off until we have some other
* reason to break user tables (like WAL).
* $Id: array.h,v 1.33 2002/08/26 17:54:02 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -35,6 +29,7 @@ typedef struct
int ndim; /* # of dimensions */
int flags; /* implementation flags */
/* flags field is currently unused, always zero. */
Oid elemtype; /* element type OID */
} ArrayType;
/*
@ -61,6 +56,7 @@ typedef struct
*/
#define ARR_SIZE(a) (((ArrayType *) (a))->size)
#define ARR_NDIM(a) (((ArrayType *) (a))->ndim)
#define ARR_ELEMTYPE(a) (((ArrayType *) (a))->elemtype)
#define ARR_DIMS(a) \
((int *) (((char *) (a)) + sizeof(ArrayType)))
@ -90,29 +86,31 @@ extern Datum array_eq(PG_FUNCTION_ARGS);
extern Datum array_dims(PG_FUNCTION_ARGS);
extern Datum array_ref(ArrayType *array, int nSubscripts, int *indx,
bool elmbyval, int elmlen,
int arraylen, bool *isNull);
int arraylen, int elmlen, bool elmbyval, char elmalign,
bool *isNull);
extern ArrayType *array_set(ArrayType *array, int nSubscripts, int *indx,
Datum dataValue,
bool elmbyval, int elmlen,
int arraylen, bool *isNull);
int arraylen, int elmlen, bool elmbyval, char elmalign,
bool *isNull);
extern ArrayType *array_get_slice(ArrayType *array, int nSubscripts,
int *upperIndx, int *lowerIndx,
bool elmbyval, int elmlen,
int arraylen, bool *isNull);
int arraylen, int elmlen, bool elmbyval, char elmalign,
bool *isNull);
extern ArrayType *array_set_slice(ArrayType *array, int nSubscripts,
int *upperIndx, int *lowerIndx,
ArrayType *srcArray,
bool elmbyval, int elmlen,
int arraylen, bool *isNull);
int arraylen, int elmlen, bool elmbyval, char elmalign,
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);
Oid elmtype,
int elmlen, bool elmbyval, char elmalign);
extern void deconstruct_array(ArrayType *array,
bool elmbyval, int elmlen, char elmalign,
Datum **elemsp, int *nelemsp);
Oid elmtype,
int elmlen, bool elmbyval, char elmalign,
Datum **elemsp, int *nelemsp);
/*