btree_text.c

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/*
 * contrib/btree_gist/btree_text.c
 */
#include "postgres.h"
 
#include "btree_gist.h"
#include "btree_utils_var.h"
#include "utils/builtins.h"
 
/*
** Text ops
*/
PG_FUNCTION_INFO_V1(gbt_text_compress);
PG_FUNCTION_INFO_V1(gbt_bpchar_compress);
PG_FUNCTION_INFO_V1(gbt_text_union);
PG_FUNCTION_INFO_V1(gbt_text_picksplit);
PG_FUNCTION_INFO_V1(gbt_text_consistent);
PG_FUNCTION_INFO_V1(gbt_bpchar_consistent);
PG_FUNCTION_INFO_V1(gbt_text_penalty);
PG_FUNCTION_INFO_V1(gbt_text_same);
 
 
/* define for comparison */
 
static bool
gbt_textgt(const void *a, const void *b, Oid collation, FmgrInfo *flinfo)
{
    return DatumGetBool(DirectFunctionCall2Coll(text_gt,
                                                collation,
                                                PointerGetDatum(a),
                                                PointerGetDatum(b)));
}
 
static bool
gbt_textge(const void *a, const void *b, Oid collation, FmgrInfo *flinfo)
{
    return DatumGetBool(DirectFunctionCall2Coll(text_ge,
                                                collation,
                                                PointerGetDatum(a),
                                                PointerGetDatum(b)));
}
 
static bool
gbt_texteq(const void *a, const void *b, Oid collation, FmgrInfo *flinfo)
{
    return DatumGetBool(DirectFunctionCall2Coll(texteq,
                                                collation,
                                                PointerGetDatum(a),
                                                PointerGetDatum(b)));
}
 
static bool
gbt_textle(const void *a, const void *b, Oid collation, FmgrInfo *flinfo)
{
    return DatumGetBool(DirectFunctionCall2Coll(text_le,
                                                collation,
                                                PointerGetDatum(a),
                                                PointerGetDatum(b)));
}
 
static bool
gbt_textlt(const void *a, const void *b, Oid collation, FmgrInfo *flinfo)
{
    return DatumGetBool(DirectFunctionCall2Coll(text_lt,
                                                collation,
                                                PointerGetDatum(a),
                                                PointerGetDatum(b)));
}
 
static int32
gbt_textcmp(const void *a, const void *b, Oid collation, FmgrInfo *flinfo)
{
    return DatumGetInt32(DirectFunctionCall2Coll(bttextcmp,
                                                 collation,
                                                 PointerGetDatum(a),
                                                 PointerGetDatum(b)));
}
 
static gbtree_vinfo tinfo =
{
    gbt_t_text,
    0,
    false,
    gbt_textgt,
    gbt_textge,
    gbt_texteq,
    gbt_textle,
    gbt_textlt,
    gbt_textcmp,
    NULL
};
 
/* bpchar needs its own comparison rules */
 
static bool
gbt_bpchargt(const void *a, const void *b, Oid collation, FmgrInfo *flinfo)
{
    return DatumGetBool(DirectFunctionCall2Coll(bpchargt,
                                                collation,
                                                PointerGetDatum(a),
                                                PointerGetDatum(b)));
}
 
static bool
gbt_bpcharge(const void *a, const void *b, Oid collation, FmgrInfo *flinfo)
{
    return DatumGetBool(DirectFunctionCall2Coll(bpcharge,
                                                collation,
                                                PointerGetDatum(a),
                                                PointerGetDatum(b)));
}
 
static bool
gbt_bpchareq(const void *a, const void *b, Oid collation, FmgrInfo *flinfo)
{
    return DatumGetBool(DirectFunctionCall2Coll(bpchareq,
                                                collation,
                                                PointerGetDatum(a),
                                                PointerGetDatum(b)));
}
 
static bool
gbt_bpcharle(const void *a, const void *b, Oid collation, FmgrInfo *flinfo)
{
    return DatumGetBool(DirectFunctionCall2Coll(bpcharle,
                                                collation,
                                                PointerGetDatum(a),
                                                PointerGetDatum(b)));
}
 
static bool
gbt_bpcharlt(const void *a, const void *b, Oid collation, FmgrInfo *flinfo)
{
    return DatumGetBool(DirectFunctionCall2Coll(bpcharlt,
                                                collation,
                                                PointerGetDatum(a),
                                                PointerGetDatum(b)));
}
 
static int32
gbt_bpcharcmp(const void *a, const void *b, Oid collation, FmgrInfo *flinfo)
{
    return DatumGetInt32(DirectFunctionCall2Coll(bpcharcmp,
                                                 collation,
                                                 PointerGetDatum(a),
                                                 PointerGetDatum(b)));
}
 
static gbtree_vinfo bptinfo =
{
    gbt_t_bpchar,
    0,
    false,
    gbt_bpchargt,
    gbt_bpcharge,
    gbt_bpchareq,
    gbt_bpcharle,
    gbt_bpcharlt,
    gbt_bpcharcmp,
    NULL
};
 
 
/**************************************************
 * Text ops
 **************************************************/
 
 
Datum
gbt_text_compress(PG_FUNCTION_ARGS)
{
    GISTENTRY  *entry = (GISTENTRY *) PG_GETARG_POINTER(0);
 
    if (tinfo.eml == 0)
    {
        tinfo.eml = pg_database_encoding_max_length();
    }
 
    PG_RETURN_POINTER(gbt_var_compress(entry, &tinfo));
}
 
Datum
gbt_bpchar_compress(PG_FUNCTION_ARGS)
{
    /* This should never have been distinct from gbt_text_compress */
    return gbt_text_compress(fcinfo);
}
 
 
 
Datum
gbt_text_consistent(PG_FUNCTION_ARGS)
{
    GISTENTRY  *entry = (GISTENTRY *) PG_GETARG_POINTER(0);
    void       *query = (void *) DatumGetTextP(PG_GETARG_DATUM(1));
    StrategyNumber strategy = (StrategyNumber) PG_GETARG_UINT16(2);
 
    /* Oid      subtype = PG_GETARG_OID(3); */
    bool       *recheck = (bool *) PG_GETARG_POINTER(4);
    bool        retval;
    GBT_VARKEY *key = (GBT_VARKEY *) DatumGetPointer(entry->key);
    GBT_VARKEY_R r = gbt_var_key_readable(key);
 
    /* All cases served by this function are exact */
    *recheck = false;
 
    if (tinfo.eml == 0)
    {
        tinfo.eml = pg_database_encoding_max_length();
    }
 
    retval = gbt_var_consistent(&r, query, strategy, PG_GET_COLLATION(),
                                GIST_LEAF(entry), &tinfo, fcinfo->flinfo);
 
    PG_RETURN_BOOL(retval);
}
 
 
Datum
gbt_bpchar_consistent(PG_FUNCTION_ARGS)
{
    GISTENTRY  *entry = (GISTENTRY *) PG_GETARG_POINTER(0);
    void       *query = (void *) DatumGetTextP(PG_GETARG_DATUM(1));
    StrategyNumber strategy = (StrategyNumber) PG_GETARG_UINT16(2);
 
    /* Oid      subtype = PG_GETARG_OID(3); */
    bool       *recheck = (bool *) PG_GETARG_POINTER(4);
    bool        retval;
    GBT_VARKEY *key = (GBT_VARKEY *) DatumGetPointer(entry->key);
    GBT_VARKEY_R r = gbt_var_key_readable(key);
 
    /* All cases served by this function are exact */
    *recheck = false;
 
    if (bptinfo.eml == 0)
    {
        bptinfo.eml = pg_database_encoding_max_length();
    }
 
    retval = gbt_var_consistent(&r, query, strategy, PG_GET_COLLATION(),
                                GIST_LEAF(entry), &bptinfo, fcinfo->flinfo);
    PG_RETURN_BOOL(retval);
}
 
 
Datum
gbt_text_union(PG_FUNCTION_ARGS)
{
    GistEntryVector *entryvec = (GistEntryVector *) PG_GETARG_POINTER(0);
    int32      *size = (int *) PG_GETARG_POINTER(1);
 
    PG_RETURN_POINTER(gbt_var_union(entryvec, size, PG_GET_COLLATION(),
                                    &tinfo, fcinfo->flinfo));
}
 
 
Datum
gbt_text_picksplit(PG_FUNCTION_ARGS)
{
    GistEntryVector *entryvec = (GistEntryVector *) PG_GETARG_POINTER(0);
    GIST_SPLITVEC *v = (GIST_SPLITVEC *) PG_GETARG_POINTER(1);
 
    gbt_var_picksplit(entryvec, v, PG_GET_COLLATION(),
                      &tinfo, fcinfo->flinfo);
    PG_RETURN_POINTER(v);
}
 
Datum
gbt_text_same(PG_FUNCTION_ARGS)
{
    Datum       d1 = PG_GETARG_DATUM(0);
    Datum       d2 = PG_GETARG_DATUM(1);
    bool       *result = (bool *) PG_GETARG_POINTER(2);
 
    *result = gbt_var_same(d1, d2, PG_GET_COLLATION(), &tinfo, fcinfo->flinfo);
    PG_RETURN_POINTER(result);
}
 
 
Datum
gbt_text_penalty(PG_FUNCTION_ARGS)
{
    GISTENTRY  *o = (GISTENTRY *) PG_GETARG_POINTER(0);
    GISTENTRY  *n = (GISTENTRY *) PG_GETARG_POINTER(1);
    float      *result = (float *) PG_GETARG_POINTER(2);
 
    PG_RETURN_POINTER(gbt_var_penalty(result, o, n, PG_GET_COLLATION(),
                                      &tinfo, fcinfo->flinfo));
}