mirror of
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d64713df7e
Since collation is effectively an argument, not a property of the function, FmgrInfo is really the wrong place for it; and this becomes critical in cases where a cached FmgrInfo is used for varying purposes that might need different collation settings. Fix by passing it in FunctionCallInfoData instead. In particular this allows a clean fix for bug #5970 (record_cmp not working). This requires touching a bit more code than the original method, but nobody ever thought that collations would not be an invasive patch...
445 lines
11 KiB
C
445 lines
11 KiB
C
/*
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* contrib/btree_gin/btree_gin.c
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*/
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#include "postgres.h"
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#include <limits.h>
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#include "fmgr.h"
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#include "access/skey.h"
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#include "catalog/pg_collation.h"
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#include "utils/builtins.h"
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#include "utils/bytea.h"
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#include "utils/cash.h"
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#include "utils/date.h"
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#include "utils/inet.h"
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#include "utils/numeric.h"
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#include "utils/timestamp.h"
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#include "utils/varbit.h"
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PG_MODULE_MAGIC;
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typedef struct TypeInfo
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{
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bool is_varlena;
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Datum (*leftmostvalue) (void);
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Datum (*typecmp) (FunctionCallInfo);
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} TypeInfo;
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typedef struct QueryInfo
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{
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StrategyNumber strategy;
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Datum datum;
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} QueryInfo;
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#define GIN_EXTRACT_VALUE(type) \
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PG_FUNCTION_INFO_V1(gin_extract_value_##type); \
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Datum gin_extract_value_##type(PG_FUNCTION_ARGS); \
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Datum \
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gin_extract_value_##type(PG_FUNCTION_ARGS) \
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{ \
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Datum datum = PG_GETARG_DATUM(0); \
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int32 *nentries = (int32 *) PG_GETARG_POINTER(1); \
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Datum *entries = (Datum *) palloc(sizeof(Datum)); \
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\
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if ( TypeInfo_##type.is_varlena ) \
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datum = PointerGetDatum(PG_DETOAST_DATUM(datum)); \
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entries[0] = datum; \
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*nentries = 1; \
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\
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PG_RETURN_POINTER(entries); \
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}
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/*
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* For BTGreaterEqualStrategyNumber, BTGreaterStrategyNumber, and
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* BTEqualStrategyNumber we want to start the index scan at the
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* supplied query datum, and work forward. For BTLessStrategyNumber
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* and BTLessEqualStrategyNumber, we need to start at the leftmost
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* key, and work forward until the supplied query datum (which must be
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* sent along inside the QueryInfo structure).
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*/
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#define GIN_EXTRACT_QUERY(type) \
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PG_FUNCTION_INFO_V1(gin_extract_query_##type); \
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Datum gin_extract_query_##type(PG_FUNCTION_ARGS); \
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Datum \
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gin_extract_query_##type(PG_FUNCTION_ARGS) \
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{ \
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Datum datum = PG_GETARG_DATUM(0); \
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int32 *nentries = (int32 *) PG_GETARG_POINTER(1); \
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StrategyNumber strategy = PG_GETARG_UINT16(2); \
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bool **partialmatch = (bool **) PG_GETARG_POINTER(3); \
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Pointer **extra_data = (Pointer **) PG_GETARG_POINTER(4); \
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Datum *entries = (Datum *) palloc(sizeof(Datum)); \
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QueryInfo *data = (QueryInfo *) palloc(sizeof(QueryInfo)); \
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bool *ptr_partialmatch; \
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\
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*nentries = 1; \
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ptr_partialmatch = *partialmatch = (bool *) palloc(sizeof(bool)); \
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*ptr_partialmatch = false; \
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if ( TypeInfo_##type.is_varlena ) \
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datum = PointerGetDatum(PG_DETOAST_DATUM(datum)); \
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data->strategy = strategy; \
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data->datum = datum; \
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*extra_data = (Pointer *) palloc(sizeof(Pointer)); \
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**extra_data = (Pointer) data; \
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\
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switch (strategy) \
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{ \
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case BTLessStrategyNumber: \
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case BTLessEqualStrategyNumber: \
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entries[0] = TypeInfo_##type.leftmostvalue(); \
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*ptr_partialmatch = true; \
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break; \
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case BTGreaterEqualStrategyNumber: \
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case BTGreaterStrategyNumber: \
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*ptr_partialmatch = true; \
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case BTEqualStrategyNumber: \
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entries[0] = datum; \
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break; \
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default: \
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elog(ERROR, "unrecognized strategy number: %d", strategy); \
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} \
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\
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PG_RETURN_POINTER(entries); \
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}
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/*
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* Datum a is a value from extract_query method and for BTLess*
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* strategy it is a left-most value. So, use original datum from QueryInfo
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* to decide to stop scanning or not. Datum b is always from index.
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*/
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#define GIN_COMPARE_PREFIX(type) \
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PG_FUNCTION_INFO_V1(gin_compare_prefix_##type); \
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Datum gin_compare_prefix_##type(PG_FUNCTION_ARGS); \
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Datum \
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gin_compare_prefix_##type(PG_FUNCTION_ARGS) \
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{ \
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Datum a = PG_GETARG_DATUM(0); \
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Datum b = PG_GETARG_DATUM(1); \
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QueryInfo *data = (QueryInfo *) PG_GETARG_POINTER(3); \
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int32 res, \
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cmp; \
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\
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cmp = DatumGetInt32(DirectFunctionCall2Coll( \
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TypeInfo_##type.typecmp, \
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DEFAULT_COLLATION_OID, \
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(data->strategy == BTLessStrategyNumber || \
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data->strategy == BTLessEqualStrategyNumber) \
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? data->datum : a, \
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b)); \
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\
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switch (data->strategy) \
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{ \
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case BTLessStrategyNumber: \
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/* If original datum > indexed one then return match */ \
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if (cmp > 0) \
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res = 0; \
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else \
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res = 1; \
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break; \
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case BTLessEqualStrategyNumber: \
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/* The same except equality */ \
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if (cmp >= 0) \
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res = 0; \
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else \
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res = 1; \
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break; \
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case BTEqualStrategyNumber: \
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if (cmp != 0) \
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res = 1; \
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else \
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res = 0; \
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break; \
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case BTGreaterEqualStrategyNumber: \
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/* If original datum <= indexed one then return match */ \
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if (cmp <= 0) \
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res = 0; \
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else \
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res = 1; \
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break; \
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case BTGreaterStrategyNumber: \
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/* If original datum <= indexed one then return match */ \
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/* If original datum == indexed one then continue scan */ \
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if (cmp < 0) \
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res = 0; \
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else if (cmp == 0) \
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res = -1; \
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else \
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res = 1; \
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break; \
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default: \
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elog(ERROR, "unrecognized strategy number: %d", \
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data->strategy); \
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res = 0; \
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} \
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\
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PG_RETURN_INT32(res); \
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}
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#define GIN_SUPPORT(type) \
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GIN_EXTRACT_VALUE(type) \
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GIN_EXTRACT_QUERY(type) \
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GIN_COMPARE_PREFIX(type)
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PG_FUNCTION_INFO_V1(gin_btree_consistent);
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Datum gin_btree_consistent(PG_FUNCTION_ARGS);
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Datum
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gin_btree_consistent(PG_FUNCTION_ARGS)
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{
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bool *recheck = (bool *) PG_GETARG_POINTER(5);
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*recheck = false;
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PG_RETURN_BOOL(true);
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}
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static Datum
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leftmostvalue_int2(void)
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{
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return Int16GetDatum(SHRT_MIN);
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}
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static TypeInfo TypeInfo_int2 = {false, leftmostvalue_int2, btint2cmp};
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GIN_SUPPORT(int2)
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static Datum
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leftmostvalue_int4(void)
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{
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return Int32GetDatum(INT_MIN);
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}
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static TypeInfo TypeInfo_int4 = {false, leftmostvalue_int4, btint4cmp};
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GIN_SUPPORT(int4)
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static Datum
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leftmostvalue_int8(void)
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{
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/*
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* Use sequence's definition to keep compatibility.
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*/
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return Int64GetDatum(SEQ_MINVALUE);
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}
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static TypeInfo TypeInfo_int8 = {false, leftmostvalue_int8, btint8cmp};
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GIN_SUPPORT(int8)
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static Datum
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leftmostvalue_float4(void)
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{
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return Float4GetDatum(-get_float4_infinity());
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}
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static TypeInfo TypeInfo_float4 = {false, leftmostvalue_float4, btfloat4cmp};
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GIN_SUPPORT(float4)
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static Datum
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leftmostvalue_float8(void)
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{
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return Float8GetDatum(-get_float8_infinity());
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}
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static TypeInfo TypeInfo_float8 = {false, leftmostvalue_float8, btfloat8cmp};
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GIN_SUPPORT(float8)
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static Datum
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leftmostvalue_money(void)
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{
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/*
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* Use sequence's definition to keep compatibility.
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*/
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return Int64GetDatum(SEQ_MINVALUE);
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}
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static TypeInfo TypeInfo_money = {false, leftmostvalue_money, cash_cmp};
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GIN_SUPPORT(money)
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static Datum
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leftmostvalue_oid(void)
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{
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return ObjectIdGetDatum(0);
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}
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static TypeInfo TypeInfo_oid = {false, leftmostvalue_oid, btoidcmp};
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GIN_SUPPORT(oid)
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static Datum
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leftmostvalue_timestamp(void)
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{
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return TimestampGetDatum(DT_NOBEGIN);
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}
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static TypeInfo TypeInfo_timestamp = {false, leftmostvalue_timestamp, timestamp_cmp};
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GIN_SUPPORT(timestamp)
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static TypeInfo TypeInfo_timestamptz = {false, leftmostvalue_timestamp, timestamp_cmp};
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GIN_SUPPORT(timestamptz)
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static Datum
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leftmostvalue_time(void)
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{
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return TimeADTGetDatum(0);
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}
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static TypeInfo TypeInfo_time = {false, leftmostvalue_time, time_cmp};
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GIN_SUPPORT(time)
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static Datum
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leftmostvalue_timetz(void)
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{
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TimeTzADT *v = palloc(sizeof(TimeTzADT));
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v->time = 0;
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v->zone = -24 * 3600; /* XXX is that true? */
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return TimeTzADTPGetDatum(v);
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}
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static TypeInfo TypeInfo_timetz = {false, leftmostvalue_timetz, timetz_cmp};
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GIN_SUPPORT(timetz)
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static Datum
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leftmostvalue_date(void)
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{
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return DateADTGetDatum(DATEVAL_NOBEGIN);
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}
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static TypeInfo TypeInfo_date = {false, leftmostvalue_date, date_cmp};
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GIN_SUPPORT(date)
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static Datum
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leftmostvalue_interval(void)
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{
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Interval *v = palloc(sizeof(Interval));
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v->time = DT_NOBEGIN;
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v->day = 0;
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v->month = 0;
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return IntervalPGetDatum(v);
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}
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static TypeInfo TypeInfo_interval = {false, leftmostvalue_interval, interval_cmp};
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GIN_SUPPORT(interval)
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static Datum
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leftmostvalue_macaddr(void)
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{
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macaddr *v = palloc0(sizeof(macaddr));
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return MacaddrPGetDatum(v);
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}
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static TypeInfo TypeInfo_macaddr = {false, leftmostvalue_macaddr, macaddr_cmp};
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GIN_SUPPORT(macaddr)
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static Datum
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leftmostvalue_inet(void)
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{
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return DirectFunctionCall3(inet_in,
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CStringGetDatum("0.0.0.0/0"),
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ObjectIdGetDatum(0),
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Int32GetDatum(-1));
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}
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static TypeInfo TypeInfo_inet = {true, leftmostvalue_inet, network_cmp};
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GIN_SUPPORT(inet)
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static TypeInfo TypeInfo_cidr = {true, leftmostvalue_inet, network_cmp};
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GIN_SUPPORT(cidr)
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static Datum
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leftmostvalue_text(void)
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{
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return PointerGetDatum(cstring_to_text_with_len("", 0));
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}
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static TypeInfo TypeInfo_text = {true, leftmostvalue_text, bttextcmp};
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GIN_SUPPORT(text)
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static Datum
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leftmostvalue_char(void)
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{
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return CharGetDatum(SCHAR_MIN);
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}
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static TypeInfo TypeInfo_char = {false, leftmostvalue_char, btcharcmp};
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GIN_SUPPORT(char)
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static TypeInfo TypeInfo_bytea = {true, leftmostvalue_text, byteacmp};
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GIN_SUPPORT(bytea)
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static Datum
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leftmostvalue_bit(void)
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{
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return DirectFunctionCall3(bit_in,
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CStringGetDatum(""),
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ObjectIdGetDatum(0),
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Int32GetDatum(-1));
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}
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static TypeInfo TypeInfo_bit = {true, leftmostvalue_bit, bitcmp};
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GIN_SUPPORT(bit)
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static Datum
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leftmostvalue_varbit(void)
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{
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return DirectFunctionCall3(varbit_in,
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CStringGetDatum(""),
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ObjectIdGetDatum(0),
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Int32GetDatum(-1));
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}
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static TypeInfo TypeInfo_varbit = {true, leftmostvalue_varbit, bitcmp};
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GIN_SUPPORT(varbit)
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/*
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* Numeric type hasn't a real left-most value, so we use PointerGetDatum(NULL)
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* (*not* a SQL NULL) to represent that. We can get away with that because
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* the value returned by our leftmostvalue function will never be stored in
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* the index nor passed to anything except our compare and prefix-comparison
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* functions. The same trick could be used for other pass-by-reference types.
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*/
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#define NUMERIC_IS_LEFTMOST(x) ((x) == NULL)
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PG_FUNCTION_INFO_V1(gin_numeric_cmp);
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Datum gin_numeric_cmp(PG_FUNCTION_ARGS);
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Datum
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gin_numeric_cmp(PG_FUNCTION_ARGS)
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{
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Numeric a = (Numeric) PG_GETARG_POINTER(0);
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Numeric b = (Numeric) PG_GETARG_POINTER(1);
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int res = 0;
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if (NUMERIC_IS_LEFTMOST(a))
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{
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res = (NUMERIC_IS_LEFTMOST(b)) ? 0 : -1;
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}
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else if (NUMERIC_IS_LEFTMOST(b))
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{
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res = 1;
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}
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else
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{
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res = DatumGetInt32(DirectFunctionCall2(numeric_cmp,
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NumericGetDatum(a),
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NumericGetDatum(b)));
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}
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PG_RETURN_INT32(res);
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}
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static Datum
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leftmostvalue_numeric(void)
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{
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return PointerGetDatum(NULL);
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}
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static TypeInfo TypeInfo_numeric = {true, leftmostvalue_numeric, gin_numeric_cmp};
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GIN_SUPPORT(numeric)
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