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Create real array comparison functions (that use the element datatype's

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comparison functions), replacing the highly bogus bitwise array_eq.  Create
a btree index opclass for ANYARRAY --- it is now possible to create indexes
on array columns.
Arrange to cache the results of catalog lookups across multiple array
operations, instead of repeating the lookups on every call.
Add string_to_array and array_to_string functions.
Remove singleton_array, array_accum, array_assign, and array_subscript
functions, since these were for proof-of-concept and not intended to become
supported functions.
Minor adjustments to behavior in some corner cases with empty or
zero-dimensional arrays.

Joe Conway (with some editorializing by Tom Lane).
This commit is contained in:
Tom Lane
2003-06-27 00:33:26 +00:00
parent 0c985ab5a8
commit b3c0551eda
28 changed files with 1731 additions and 557 deletions
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55
src/include/utils/array.h
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@ -10,7 +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 1.40 2003/06/25 21:30:33 momjian Exp $
* $Id: array.h,v 1.41 2003/06/27 00:33:26 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -32,6 +32,37 @@ typedef struct
Oid elemtype; /* element type OID */
} ArrayType;
typedef struct ArrayBuildState
{
MemoryContext mcontext; /* where all the temp stuff is kept */
Datum *dvalues; /* array of accumulated Datums */
/*
* The allocated size of dvalues[] is always a multiple of
* ARRAY_ELEMS_CHUNKSIZE
*/
#define ARRAY_ELEMS_CHUNKSIZE 64
int nelems; /* number of valid Datums in dvalues[] */
Oid element_type; /* data type of the Datums */
int16 typlen; /* needed info about datatype */
bool typbyval;
char typalign;
} ArrayBuildState;
/*
* structure to cache type metadata needed for array manipulation
*/
typedef struct ArrayMetaState
{
Oid element_type;
int16 typlen;
bool typbyval;
char typalign;
char typdelim;
Oid typelem;
Oid typiofunc;
FmgrInfo proc;
} ArrayMetaState;
/*
* fmgr macros for array objects
*/
@ -86,11 +117,15 @@ extern Datum array_recv(PG_FUNCTION_ARGS);
extern Datum array_send(PG_FUNCTION_ARGS);
extern Datum array_length_coerce(PG_FUNCTION_ARGS);
extern Datum array_eq(PG_FUNCTION_ARGS);
extern Datum array_ne(PG_FUNCTION_ARGS);
extern Datum array_lt(PG_FUNCTION_ARGS);
extern Datum array_gt(PG_FUNCTION_ARGS);
extern Datum array_le(PG_FUNCTION_ARGS);
extern Datum array_ge(PG_FUNCTION_ARGS);
extern Datum btarraycmp(PG_FUNCTION_ARGS);
extern Datum array_dims(PG_FUNCTION_ARGS);
extern Datum array_lower(PG_FUNCTION_ARGS);
extern Datum array_upper(PG_FUNCTION_ARGS);
extern Datum array_assign(PG_FUNCTION_ARGS);
extern Datum array_subscript(PG_FUNCTION_ARGS);
extern Datum array_type_coerce(PG_FUNCTION_ARGS);
extern Datum array_ref(ArrayType *array, int nSubscripts, int *indx,
@ -124,7 +159,14 @@ extern void deconstruct_array(ArrayType *array,
Oid elmtype,
int elmlen, bool elmbyval, char elmalign,
Datum **elemsp, int *nelemsp);
extern ArrayBuildState *accumArrayResult(ArrayBuildState *astate,
Datum dvalue, bool disnull,
Oid element_type,
MemoryContext rcontext);
extern Datum makeArrayResult(ArrayBuildState *astate,
MemoryContext rcontext);
extern Datum makeMdArrayResult(ArrayBuildState *astate, int ndims,
int *dims, int *lbs, MemoryContext rcontext);
/*
* prototypes for functions defined in arrayutils.c
@ -141,12 +183,11 @@ extern int mda_next_tuple(int n, int *curr, int *span);
/*
* prototypes for functions defined in array_userfuncs.c
*/
extern Datum singleton_array(PG_FUNCTION_ARGS);
extern Datum array_push(PG_FUNCTION_ARGS);
extern Datum array_accum(PG_FUNCTION_ARGS);
extern Datum array_cat(PG_FUNCTION_ARGS);
extern ArrayType *create_singleton_array(Oid element_type,
extern ArrayType *create_singleton_array(FunctionCallInfo fcinfo,
Oid element_type,
Datum element,
int ndims);