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Implement operator class parameters

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PostgreSQL provides set of template index access methods, where opclasses have
much freedom in the semantics of indexing.  These index AMs are GiST, GIN,
SP-GiST and BRIN.  There opclasses define representation of keys, operations on
them and supported search strategies.  So, it's natural that opclasses may be
faced some tradeoffs, which require user-side decision.  This commit implements
opclass parameters allowing users to set some values, which tell opclass how to
index the particular dataset.

This commit doesn't introduce new storage in system catalog.  Instead it uses
pg_attribute.attoptions, which is used for table column storage options but
unused for index attributes.

In order to evade changing signature of each opclass support function, we
implement unified way to pass options to opclass support functions.  Options
are set to fn_expr as the constant bytea expression.  It's possible due to the
fact that opclass support functions are executed outside of expressions, so
fn_expr is unused for them.

This commit comes with some examples of opclass options usage.  We parametrize
signature length in GiST.  That applies to multiple opclasses: tsvector_ops,
gist__intbig_ops, gist_ltree_ops, gist__ltree_ops, gist_trgm_ops and
gist_hstore_ops.  Also we parametrize maximum number of integer ranges for
gist__int_ops.  However, the main future usage of this feature is expected
to be json, where users would be able to specify which way to index particular
json parts.

Catversion is bumped.

Discussion: https://postgr.es/m/d22c3a18-31c7-1879-fc11-4c1ce2f5e5af%40postgrespro.ru
Author: Nikita Glukhov, revised by me
Reviwed-by: Nikolay Shaplov, Robert Haas, Tom Lane, Tomas Vondra, Alvaro Herrera
This commit is contained in:
Alexander Korotkov
2020-03-30 19:17:11 +03:00
parent 1d53432ff9
commit 911e702077
108 changed files with 4086 additions and 924 deletions
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45
contrib/intarray/_int.h
View File

@ -8,7 +8,19 @@
#include "utils/memutils.h"
/* number ranges for compression */
#define MAXNUMRANGE 100
#define G_INT_NUMRANGES_DEFAULT 100
#define G_INT_NUMRANGES_MAX ((GISTMaxIndexKeySize - VARHDRSZ) / \
(2 * sizeof(int32)))
#define G_INT_GET_NUMRANGES() (PG_HAS_OPCLASS_OPTIONS() ? \
((GISTIntArrayOptions *) PG_GET_OPCLASS_OPTIONS())->num_ranges : \
G_INT_NUMRANGES_DEFAULT)
/* gist_int_ops opclass options */
typedef struct
{
int32 vl_len_; /* varlena header (do not touch directly!) */
int num_ranges; /* number of ranges */
} GISTIntArrayOptions;
/* useful macros for accessing int4 arrays */
#define ARRPTR(x) ( (int32 *) ARR_DATA_PTR(x) )
@ -47,15 +59,17 @@
/* bigint defines */
#define SIGLENINT 63 /* >122 => key will toast, so very slow!!! */
#define SIGLEN ( sizeof(int)*SIGLENINT )
#define SIGLENBIT (SIGLEN*BITS_PER_BYTE)
#define SIGLEN_DEFAULT (63 * 4)
#define SIGLEN_MAX GISTMaxIndexKeySize
#define SIGLENBIT(siglen) ((siglen) * BITS_PER_BYTE)
#define GET_SIGLEN() (PG_HAS_OPCLASS_OPTIONS() ? \
((GISTIntArrayBigOptions *) PG_GET_OPCLASS_OPTIONS())->siglen : \
SIGLEN_DEFAULT)
typedef char BITVEC[SIGLEN];
typedef char *BITVECP;
#define LOOPBYTE \
for(i=0;i<SIGLEN;i++)
#define LOOPBYTE(siglen) \
for (i = 0; i < siglen; i++)
/* beware of multiple evaluation of arguments to these macros! */
#define GETBYTE(x,i) ( *( (BITVECP)(x) + (int)( (i) / BITS_PER_BYTE ) ) )
@ -63,8 +77,15 @@ typedef char *BITVECP;
#define CLRBIT(x,i) GETBYTE(x,i) &= ~( 0x01 << ( (i) % BITS_PER_BYTE ) )
#define SETBIT(x,i) GETBYTE(x,i) |= ( 0x01 << ( (i) % BITS_PER_BYTE ) )
#define GETBIT(x,i) ( (GETBYTE(x,i) >> ( (i) % BITS_PER_BYTE )) & 0x01 )
#define HASHVAL(val) (((unsigned int)(val)) % SIGLENBIT)
#define HASH(sign, val) SETBIT((sign), HASHVAL(val))
#define HASHVAL(val, siglen) (((unsigned int)(val)) % SIGLENBIT(siglen))
#define HASH(sign, val, siglen) SETBIT((sign), HASHVAL(val, siglen))
/* gist_intbig_ops opclass options */
typedef struct
{
int32 vl_len_; /* varlena header (do not touch directly!) */
int siglen; /* signature length in bytes */
} GISTIntArrayBigOptions;
/*
* type of index key
@ -81,7 +102,7 @@ typedef struct
#define ISALLTRUE(x) ( ((GISTTYPE*)x)->flag & ALLISTRUE )
#define GTHDRSIZE (VARHDRSZ + sizeof(int32))
#define CALCGTSIZE(flag) ( GTHDRSIZE+(((flag) & ALLISTRUE) ? 0 : SIGLEN) )
#define CALCGTSIZE(flag, siglen) ( GTHDRSIZE+(((flag) & ALLISTRUE) ? 0 : (siglen)) )
#define GETSIGN(x) ( (BITVECP)( (char*)x+GTHDRSIZE ) )
@ -103,7 +124,7 @@ bool inner_int_contains(ArrayType *a, ArrayType *b);
ArrayType *inner_int_union(ArrayType *a, ArrayType *b);
ArrayType *inner_int_inter(ArrayType *a, ArrayType *b);
void rt__int_size(ArrayType *a, float *size);
void gensign(BITVEC sign, int *a, int len);
void gensign(BITVECP sign, int *a, int len, int siglen);
/*****************************************************************************
@ -149,7 +170,7 @@ typedef struct QUERYTYPE
#define PG_GETARG_QUERYTYPE_P(n) DatumGetQueryTypeP(PG_GETARG_DATUM(n))
#define PG_GETARG_QUERYTYPE_P_COPY(n) DatumGetQueryTypePCopy(PG_GETARG_DATUM(n))
bool signconsistent(QUERYTYPE *query, BITVEC sign, bool calcnot);
bool signconsistent(QUERYTYPE *query, BITVECP sign, int siglen, bool calcnot);
bool execconsistent(QUERYTYPE *query, ArrayType *array, bool calcnot);
bool gin_bool_consistent(QUERYTYPE *query, bool *check);