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pltsql_coerce.c
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pltsql_coerce.c
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/*-------------------------------------------------------------------------
*
* pltsql_coerce.c
* Datatype Coercion Utility for Babel
*
*-------------------------------------------------------------------------
*/
#include "postgres.h"
#include "access/htup_details.h"
#include "access/parallel.h" /* InitializingParallelWorker */
#include "miscadmin.h"
#include "catalog/pg_authid.h"
#include "catalog/pg_cast.h"
#include "catalog/pg_type.h"
#include "catalog/pg_proc.h"
#include "catalog/pg_namespace.h"
#include "collation.h"
#include "executor/spi.h"
#include "mb/pg_wchar.h"
#include "nodes/makefuncs.h"
#include "parser/parse_coerce.h"
#include "parser/parse_func.h"
#include "parser/parse_type.h"
#include "src/collation.h"
#include "utils/builtins.h"
#include "utils/float.h"
#include "utils/guc.h"
#include "common/int.h"
#include "utils/numeric.h"
#include "utils/memutils.h"
#include "utils/lsyscache.h"
#include "utils/syscache.h"
#include "pltsql_instr.h"
#include "parser/parse_target.h"
#include <math.h>
#include "pltsql.h"
/* Hooks for engine*/
extern find_coercion_pathway_hook_type find_coercion_pathway_hook;
extern determine_datatype_precedence_hook_type determine_datatype_precedence_hook;
extern func_select_candidate_hook_type func_select_candidate_hook;
extern coerce_string_literal_hook_type coerce_string_literal_hook;
extern select_common_type_hook_type select_common_type_hook;
extern select_common_typmod_hook_type select_common_typmod_hook;
PG_FUNCTION_INFO_V1(init_tsql_coerce_hash_tab);
PG_FUNCTION_INFO_V1(init_tsql_datatype_precedence_hash_tab);
static Oid select_common_type_setop(ParseState *pstate, List *exprs, Node **which_expr);
static Oid select_common_type_for_isnull(ParseState *pstate, List *exprs);
/* Memory Context */
static MemoryContext pltsql_coercion_context = NULL;
typedef enum
{
PG_CAST_ENTRY, TSQL_CAST_ENTRY, TSQL_CAST_WITHOUT_FUNC_ENTRY
} cast_type;
typedef struct tsql_cast_raw_info
{
cast_type casttype;
const char *srcnsp;
const char *srctypname;
const char *tarnsp;
const char *tartypname;
const char *castfunc;
char castcontext;
char castmethod;
} tsql_cast_raw_info_t;
tsql_cast_raw_info_t tsql_cast_raw_infos[] =
{
{PG_CAST_ENTRY, "pg_catalog", "float8", "pg_catalog", "float4", NULL, 'i', 'f'},
{PG_CAST_ENTRY, "pg_catalog", "float8", "pg_catalog", "numeric", NULL, 'i', 'f'},
{PG_CAST_ENTRY, "pg_catalog", "float8", "sys", "fixeddecimal", NULL, 'i', 'f'},
{TSQL_CAST_ENTRY, "pg_catalog", "float8", "pg_catalog", "int8", "dtrunci8", 'i', 'f'},
{TSQL_CAST_ENTRY, "pg_catalog", "float8", "pg_catalog", "int4", "dtrunci4", 'i', 'f'},
{TSQL_CAST_ENTRY, "pg_catalog", "float8", "pg_catalog", "int2", "dtrunci2", 'i', 'f'},
/* float4 */
{PG_CAST_ENTRY, "pg_catalog", "float4", "pg_catalog", "numeric", NULL, 'i', 'f'},
{PG_CAST_ENTRY, "pg_catalog", "float4", "sys", "fixeddecimal", NULL, 'i', 'f'},
{TSQL_CAST_ENTRY, "pg_catalog", "float4", "pg_catalog", "int8", "ftrunci8", 'i', 'f'},
{TSQL_CAST_ENTRY, "pg_catalog", "float4", "pg_catalog", "int4", "ftrunci4", 'i', 'f'},
{TSQL_CAST_ENTRY, "pg_catalog", "float4", "pg_catalog", "int2", "ftrunci2", 'i', 'f'},
/* numeric */
{TSQL_CAST_ENTRY, "pg_catalog", "numeric", "pg_catalog", "int8", "_trunc_numeric_to_int8", 'i', 'f'},
{TSQL_CAST_ENTRY, "pg_catalog", "numeric", "pg_catalog", "int4", "_trunc_numeric_to_int4", 'i', 'f'},
{TSQL_CAST_ENTRY, "pg_catalog", "numeric", "pg_catalog", "int2", "_trunc_numeric_to_int2", 'i', 'f'},
/* {"sys", "fixeddecimal", "pg_catalog", "int8", 'i'}, */
{TSQL_CAST_ENTRY, "sys", "fixeddecimal", "pg_catalog", "int8", "_round_fixeddecimal_to_int8", 'i', 'f'},
{TSQL_CAST_ENTRY, "sys", "fixeddecimal", "pg_catalog", "int4", "_round_fixeddecimal_to_int4", 'i', 'f'},
{TSQL_CAST_ENTRY, "sys", "fixeddecimal", "pg_catalog", "int2", "_round_fixeddecimal_to_int2", 'i', 'f'},
/* bit */
{PG_CAST_ENTRY, "pg_catalog", "int2", "sys", "bit", NULL, 'i', 'f'},
{PG_CAST_ENTRY, "pg_catalog", "int4", "sys", "bit", NULL, 'i', 'f'},
{PG_CAST_ENTRY, "pg_catalog", "int8", "sys", "bit", NULL, 'i', 'f'},
/* int8 */
{PG_CAST_ENTRY, "pg_catalog", "int8", "pg_catalog", "int4", NULL, 'i', 'f'},
{PG_CAST_ENTRY, "pg_catalog", "int8", "pg_catalog", "int2", NULL, 'i', 'f'},
{TSQL_CAST_ENTRY, "pg_catalog", "int8", "sys", "money", "int8_to_money", 'i', 'f'},
{TSQL_CAST_ENTRY, "pg_catalog", "int8", "sys", "smallmoney", "int8_to_smallmoney", 'i', 'f'},
/* int4 */
{PG_CAST_ENTRY, "pg_catalog", "int4", "pg_catalog", "int2", NULL, 'i', 'f'},
/* varbinary {only allow to cast to integral data type) */
{PG_CAST_ENTRY, "sys", "bbf_varbinary", "pg_catalog", "int8", NULL, 'i', 'f'},
{PG_CAST_ENTRY, "sys", "bbf_varbinary", "pg_catalog", "int4", NULL, 'i', 'f'},
{PG_CAST_ENTRY, "sys", "bbf_varbinary", "pg_catalog", "int2", NULL, 'i', 'f'},
{TSQL_CAST_ENTRY, "sys", "bbf_varbinary", "sys", "rowversion", "varbinaryrowversion", 'i', 'f'},
{TSQL_CAST_WITHOUT_FUNC_ENTRY, "sys", "bbf_varbinary", "sys", "bbf_binary", NULL, 'i', 'b'},
/* binary {only allow to cast to integral data type) */
{PG_CAST_ENTRY, "sys", "bbf_binary", "pg_catalog", "int8", NULL, 'i', 'f'},
{PG_CAST_ENTRY, "sys", "bbf_binary", "pg_catalog", "int4", NULL, 'i', 'f'},
{PG_CAST_ENTRY, "sys", "bbf_binary", "pg_catalog", "int2", NULL, 'i', 'f'},
{TSQL_CAST_ENTRY, "sys", "bbf_binary", "sys", "rowversion", "binaryrowversion", 'i', 'f'},
{TSQL_CAST_WITHOUT_FUNC_ENTRY, "sys", "bbf_binary", "sys", "bbf_varbinary", NULL, 'i', 'b'},
/* rowversion */
{PG_CAST_ENTRY, "sys", "rowversion", "pg_catalog", "int8", NULL, 'i', 'f'},
{PG_CAST_ENTRY, "sys", "rowversion", "pg_catalog", "int4", NULL, 'i', 'f'},
{PG_CAST_ENTRY, "sys", "rowversion", "pg_catalog", "int2", NULL, 'i', 'f'},
{TSQL_CAST_ENTRY, "pg_catalog", "xid8", "sys", "rowversion", "xid8rowversion", 'i', 'f'},
{TSQL_CAST_WITHOUT_FUNC_ENTRY, "sys", "rowversion", "sys", "bbf_varbinary", NULL, 'i', 'b'},
{TSQL_CAST_WITHOUT_FUNC_ENTRY, "sys", "rowversion", "sys", "bbf_binary", NULL, 'i', 'b'},
/* characters */
{TSQL_CAST_ENTRY, "pg_catalog", "text", "sys", "fixeddecimal", "char_to_fixeddecimal", 'i', 'f'},
{TSQL_CAST_ENTRY, "pg_catalog", "bpchar", "sys", "fixeddecimal", "char_to_fixeddecimal", 'i', 'f'},
{TSQL_CAST_ENTRY, "sys", "bpchar", "sys", "fixeddecimal", "char_to_fixeddecimal", 'i', 'f'},
{TSQL_CAST_ENTRY, "pg_catalog", "varchar", "sys", "fixeddecimal", "char_to_fixeddecimal", 'i', 'f'},
{TSQL_CAST_ENTRY, "sys", "varchar", "sys", "fixeddecimal", "char_to_fixeddecimal", 'i', 'f'},
/* smalldatetime */
{PG_CAST_ENTRY, "pg_catalog", "date", "sys", "smalldatetime", NULL, 'i', 'f'},
{PG_CAST_ENTRY, "pg_catalog", "time", "sys", "smalldatetime", NULL, 'i', 'f'},
{PG_CAST_ENTRY, "sys", "smalldatetime", "sys", "datetime", NULL, 'i', 'b'},
{PG_CAST_ENTRY, "sys", "smalldatetime", "sys", "datetime2", NULL, 'i', 'b'},
{PG_CAST_ENTRY, "sys", "smalldatetime", "pg_catalog", "varchar", NULL, 'i', 'f'},
{PG_CAST_ENTRY, "sys", "smalldatetime", "sys", "varchar", NULL, 'i', 'f'},
{PG_CAST_ENTRY, "sys", "smalldatetime", "pg_catalog", "bpchar", NULL, 'i', 'f'},
{PG_CAST_ENTRY, "pg_catalog", "varchar", "sys", "smalldatetime", NULL, 'i', 'f'},
{PG_CAST_ENTRY, "sys", "varchar", "sys", "smalldatetime", NULL, 'i', 'f'},
{PG_CAST_ENTRY, "pg_catalog", "bpchar", "sys", "smalldatetime", NULL, 'i', 'f'},
{PG_CAST_ENTRY, "sys", "bpchar", "sys", "smalldatetime", NULL, 'i', 'f'},
{TSQL_CAST_ENTRY, "sys", "smalldatetime", "sys", "bit", "smalldatetime_to_bit", 'i', 'f'},
{TSQL_CAST_ENTRY, "sys", "smalldatetime", "pg_catalog", "int2", "smalldatetime_to_int2", 'i', 'f'},
{TSQL_CAST_ENTRY, "sys", "smalldatetime", "pg_catalog", "int4", "smalldatetime_to_int4", 'i', 'f'},
{TSQL_CAST_ENTRY, "sys", "smalldatetime", "pg_catalog", "int8", "smalldatetime_to_int8", 'i', 'f'},
{TSQL_CAST_ENTRY, "sys", "smalldatetime", "pg_catalog", "float4", "smalldatetime_to_float4", 'i', 'f'},
{TSQL_CAST_ENTRY, "sys", "smalldatetime", "pg_catalog", "float8", "smalldatetime_to_float8", 'i', 'f'},
{TSQL_CAST_ENTRY, "sys", "smalldatetime", "pg_catalog", "numeric", "smalldatetime_to_numeric", 'i', 'f'},
/* datetime */
{PG_CAST_ENTRY, "sys", "datetime", "pg_catalog", "date", NULL, 'i', 'f'},
{PG_CAST_ENTRY, "sys", "datetime", "pg_catalog", "time", NULL, 'i', 'f'},
{PG_CAST_ENTRY, "sys", "datetime", "sys", "smalldatetime", NULL, 'i', 'f'},
{PG_CAST_ENTRY, "sys", "datetime", "pg_catalog", "varchar", NULL, 'i', 'f'},
{PG_CAST_ENTRY, "sys", "datetime", "sys", "varchar", NULL, 'i', 'f'},
{PG_CAST_ENTRY, "sys", "datetime", "pg_catalog", "bpchar", NULL, 'i', 'f'},
{PG_CAST_ENTRY, "pg_catalog", "varchar", "sys", "datetime", NULL, 'i', 'f'},
{PG_CAST_ENTRY, "sys", "varchar", "sys", "datetime", NULL, 'i', 'f'},
{PG_CAST_ENTRY, "pg_catalog", "bpchar", "sys", "datetime", NULL, 'i', 'f'},
{PG_CAST_ENTRY, "sys", "bpchar", "sys", "datetime", NULL, 'i', 'f'},
{TSQL_CAST_ENTRY, "sys", "datetime", "sys", "bit", "datetime_to_bit", 'i', 'f'},
{TSQL_CAST_ENTRY, "sys", "datetime", "pg_catalog", "int2", "datetime_to_int2", 'i', 'f'},
{TSQL_CAST_ENTRY, "sys", "datetime", "pg_catalog", "int4", "datetime_to_int4", 'i', 'f'},
{TSQL_CAST_ENTRY, "sys", "datetime", "pg_catalog", "int8", "datetime_to_int8", 'i', 'f'},
{TSQL_CAST_ENTRY, "sys", "datetime", "pg_catalog", "float4", "datetime_to_float4", 'i', 'f'},
{TSQL_CAST_ENTRY, "sys", "datetime", "pg_catalog", "float8", "datetime_to_float8", 'i', 'f'},
{TSQL_CAST_ENTRY, "sys", "datetime", "pg_catalog", "numeric", "datetime_to_numeric", 'i', 'f'},
/* datetime2 */
{PG_CAST_ENTRY, "sys", "datetime2", "pg_catalog", "date", NULL, 'i', 'f'},
{PG_CAST_ENTRY, "sys", "datetime2", "pg_catalog", "time", NULL, 'i', 'f'},
{PG_CAST_ENTRY, "sys", "datetime2", "sys", "smalldatetime", NULL, 'i', 'f'},
{PG_CAST_ENTRY, "sys", "datetime2", "sys", "datetime", NULL, 'i', 'f'},
{PG_CAST_ENTRY, "sys", "datetime2", "pg_catalog", "varchar", NULL, 'i', 'f'},
{PG_CAST_ENTRY, "sys", "datetime2", "sys", "varchar", NULL, 'i', 'f'},
{PG_CAST_ENTRY, "sys", "datetime2", "pg_catalog", "bpchar", NULL, 'i', 'f'},
{PG_CAST_ENTRY, "pg_catalog", "varchar", "sys", "datetime2", NULL, 'i', 'f'},
{PG_CAST_ENTRY, "sys", "varchar", "sys", "datetime2", NULL, 'i', 'f'},
{PG_CAST_ENTRY, "pg_catalog", "bpchar", "sys", "datetime2", NULL, 'i', 'f'},
/* datetimeoffset */
{TSQL_CAST_ENTRY, "sys", "datetimeoffset", "pg_catalog", "time", "datetimeoffset2time", 'i', 'f'},
{TSQL_CAST_ENTRY, "sys", "datetimeoffset", "pg_catalog", "date", "datetimeoffset2date", 'i', 'f'},
{TSQL_CAST_ENTRY, "sys", "datetimeoffset", "sys", "datetime", "datetimeoffset2datetime", 'i', 'f'},
{TSQL_CAST_ENTRY, "sys", "datetimeoffset", "sys", "datetime2", "datetimeoffset2datetime2", 'i', 'f'},
{TSQL_CAST_ENTRY, "sys", "datetimeoffset", "sys", "smalldatetime", "datetimeoffset2smalldatetime", 'i', 'f'},
{TSQL_CAST_ENTRY, "pg_catalog", "time", "sys", "datetimeoffset", "time2datetimeoffset", 'i', 'f'},
{TSQL_CAST_ENTRY, "pg_catalog", "date", "sys", "datetimeoffset", "date2datetimeoffset", 'i', 'f'},
{TSQL_CAST_ENTRY, "sys", "datetime", "sys", "datetimeoffset", "datetime2datetimeoffset", 'i', 'f'},
{TSQL_CAST_ENTRY, "sys", "datetime2", "sys", "datetimeoffset", "datetime22datetimeoffset", 'i', 'f'},
{TSQL_CAST_ENTRY, "sys", "smalldatetime", "sys", "datetimeoffset", "smalldatetime2datetimeoffset", 'i', 'f'},
/* uniqueidentifier */
{PG_CAST_ENTRY, "sys", "bbf_binary", "sys", "uniqueidentifier", NULL, 'i', 'f'},
{PG_CAST_ENTRY, "sys", "bbf_varbinary", "sys", "uniqueidentifier", NULL, 'i', 'f'},
/* sql_variant */
/* when casting to sql variant, we need to store type information which will be lost for some of pg's domain casts */
/* so we need to manually add them here to go through tsql's casting sysem */
{TSQL_CAST_ENTRY, "sys", "money", "sys", "sql_variant", "money_sqlvariant", 'i', 'f'},
{TSQL_CAST_ENTRY, "sys", "smallmoney", "sys", "sql_variant", "smallmoney_sqlvariant", 'i', 'f'},
{TSQL_CAST_ENTRY, "sys", "smallint", "sys", "sql_variant", "smallint_sqlvariant", 'i', 'f'},
{TSQL_CAST_ENTRY, "sys", "tinyint", "sys", "sql_variant", "tinyint_sqlvariant", 'i', 'f'},
{TSQL_CAST_ENTRY, "sys", "varchar", "sys", "sql_variant", "varchar_sqlvariant", 'i', 'f'},
{TSQL_CAST_ENTRY, "pg_catalog", "varchar", "sys", "sql_variant", "varchar_sqlvariant", 'i', 'f'},
{TSQL_CAST_ENTRY, "sys", "nvarchar", "sys", "sql_variant", "nvarchar_sqlvariant", 'i', 'f'},
{TSQL_CAST_ENTRY, "pg_catalog", "bpchar", "sys", "sql_variant", "char_sqlvariant", 'i', 'f'},
{TSQL_CAST_ENTRY, "sys", "bpchar", "sys", "sql_variant", "char_sqlvariant", 'i', 'f'},
{TSQL_CAST_ENTRY, "sys", "nchar", "sys", "sql_variant", "nchar_sqlvariant", 'i', 'f'},
/* name {special overriding to handle identifier truncation) */
{TSQL_CAST_ENTRY, "pg_catalog", "text", "pg_catalog", "name", "text_to_name", 'i', 'f'},
{TSQL_CAST_ENTRY, "pg_catalog", "bpchar", "pg_catalog", "name", "bpchar_to_name", 'i', 'f'},
{TSQL_CAST_ENTRY, "sys", "bpchar", "pg_catalog", "name", "bpchar_to_name", 'i', 'f'},
{TSQL_CAST_ENTRY, "pg_catalog", "varchar", "pg_catalog", "name", "varchar_to_name", 'i', 'f'},
{TSQL_CAST_ENTRY, "sys", "varchar", "pg_catalog", "name", "varchar_to_name", 'i', 'f'},
/* string -> float8 via I/O */
{TSQL_CAST_WITHOUT_FUNC_ENTRY, "pg_catalog", "text", "pg_catalog", "float8", NULL, 'i', 'i'},
{TSQL_CAST_WITHOUT_FUNC_ENTRY, "pg_catalog", "bpchar", "pg_catalog", "float8", NULL, 'i', 'i'},
{TSQL_CAST_WITHOUT_FUNC_ENTRY, "pg_catalog", "varchar", "pg_catalog", "float8", NULL, 'i', 'i'},
/* string -> float4 via I/O */
{TSQL_CAST_WITHOUT_FUNC_ENTRY, "pg_catalog", "text", "pg_catalog", "float4", NULL, 'i', 'i'},
{TSQL_CAST_WITHOUT_FUNC_ENTRY, "pg_catalog", "bpchar", "pg_catalog", "float4", NULL, 'i', 'i'},
{TSQL_CAST_WITHOUT_FUNC_ENTRY, "pg_catalog", "varchar", "pg_catalog", "float4", NULL, 'i', 'i'},
/* string -> int2 via I/O */
{TSQL_CAST_WITHOUT_FUNC_ENTRY, "pg_catalog", "text", "pg_catalog", "int2", NULL, 'i', 'i'},
{TSQL_CAST_WITHOUT_FUNC_ENTRY, "pg_catalog", "bpchar", "pg_catalog", "int2", NULL, 'i', 'i'},
{TSQL_CAST_WITHOUT_FUNC_ENTRY, "pg_catalog", "varchar", "pg_catalog", "int2", NULL, 'i', 'i'},
/* string -> int4 via I/O */
{TSQL_CAST_WITHOUT_FUNC_ENTRY, "pg_catalog", "text", "pg_catalog", "int4", NULL, 'i', 'i'},
{TSQL_CAST_WITHOUT_FUNC_ENTRY, "pg_catalog", "bpchar", "pg_catalog", "int4", NULL, 'i', 'i'},
{TSQL_CAST_WITHOUT_FUNC_ENTRY, "pg_catalog", "varchar", "pg_catalog", "int4", NULL, 'i', 'i'},
/* string -> int8 via I/O */
{TSQL_CAST_WITHOUT_FUNC_ENTRY, "pg_catalog", "text", "pg_catalog", "int8", NULL, 'i', 'i'},
{TSQL_CAST_WITHOUT_FUNC_ENTRY, "pg_catalog", "bpchar", "pg_catalog", "int8", NULL, 'i', 'i'},
{TSQL_CAST_WITHOUT_FUNC_ENTRY, "pg_catalog", "varchar", "pg_catalog", "int8", NULL, 'i', 'i'},
/* string -> numeric via I/O */
{TSQL_CAST_WITHOUT_FUNC_ENTRY, "pg_catalog", "text", "pg_catalog", "numeric", NULL, 'i', 'i'},
{TSQL_CAST_WITHOUT_FUNC_ENTRY, "pg_catalog", "bpchar", "pg_catalog", "numeric", NULL, 'i', 'i'},
{TSQL_CAST_WITHOUT_FUNC_ENTRY, "sys", "bpchar", "pg_catalog", "numeric", NULL, 'i', 'i'},
{TSQL_CAST_WITHOUT_FUNC_ENTRY, "pg_catalog", "varchar", "pg_catalog", "numeric", NULL, 'i', 'i'},
{TSQL_CAST_WITHOUT_FUNC_ENTRY, "sys", "varchar", "pg_catalog", "numeric", NULL, 'i', 'i'},
/* string -> uniqueidentifier via I/O */
{TSQL_CAST_WITHOUT_FUNC_ENTRY, "pg_catalog", "text", "sys", "uniqueidentifier", NULL, 'i', 'i'},
{TSQL_CAST_WITHOUT_FUNC_ENTRY, "pg_catalog", "bpchar", "sys", "uniqueidentifier", NULL, 'i', 'i'},
{TSQL_CAST_WITHOUT_FUNC_ENTRY, "sys", "bpchar", "sys", "uniqueidentifier", NULL, 'i', 'i'},
{TSQL_CAST_WITHOUT_FUNC_ENTRY, "pg_catalog", "varchar", "sys", "uniqueidentifier", NULL, 'i', 'i'},
{TSQL_CAST_WITHOUT_FUNC_ENTRY, "sys", "varchar", "sys", "uniqueidentifier", NULL, 'i', 'i'},
/* int2 -> string via I/O */
{TSQL_CAST_WITHOUT_FUNC_ENTRY, "pg_catalog", "int2", "pg_catalog", "text", NULL, 'i', 'i'},
{TSQL_CAST_WITHOUT_FUNC_ENTRY, "pg_catalog", "int2", "pg_catalog", "bpchar", NULL, 'i', 'i'},
{TSQL_CAST_WITHOUT_FUNC_ENTRY, "pg_catalog", "int2", "sys", "bpchar", NULL, 'i', 'i'},
{TSQL_CAST_WITHOUT_FUNC_ENTRY, "pg_catalog", "int2", "pg_catalog", "varchar", NULL, 'i', 'i'},
{TSQL_CAST_WITHOUT_FUNC_ENTRY, "pg_catalog", "int2", "sys", "varchar", NULL, 'i', 'i'},
/* int4 -> string via I/O */
{TSQL_CAST_WITHOUT_FUNC_ENTRY, "pg_catalog", "int4", "pg_catalog", "text", NULL, 'i', 'i'},
{TSQL_CAST_WITHOUT_FUNC_ENTRY, "pg_catalog", "int4", "pg_catalog", "bpchar", NULL, 'i', 'i'},
{TSQL_CAST_WITHOUT_FUNC_ENTRY, "pg_catalog", "int4", "sys", "bpchar", NULL, 'i', 'i'},
{TSQL_CAST_WITHOUT_FUNC_ENTRY, "pg_catalog", "int4", "pg_catalog", "varchar", NULL, 'i', 'i'},
{TSQL_CAST_WITHOUT_FUNC_ENTRY, "pg_catalog", "int4", "sys", "varchar", NULL, 'i', 'i'},
/* int8 -> string via I/O */
{TSQL_CAST_WITHOUT_FUNC_ENTRY, "pg_catalog", "int8", "pg_catalog", "text", NULL, 'i', 'i'},
{TSQL_CAST_WITHOUT_FUNC_ENTRY, "pg_catalog", "int8", "pg_catalog", "bpchar", NULL, 'i', 'i'},
{TSQL_CAST_WITHOUT_FUNC_ENTRY, "pg_catalog", "int8", "sys", "bpchar", NULL, 'i', 'i'},
{TSQL_CAST_WITHOUT_FUNC_ENTRY, "pg_catalog", "int8", "pg_catalog", "varchar", NULL, 'i', 'i'},
{TSQL_CAST_WITHOUT_FUNC_ENTRY, "pg_catalog", "int8", "sys", "varchar", NULL, 'i', 'i'},
/* float4 -> string via I/O */
{TSQL_CAST_WITHOUT_FUNC_ENTRY, "pg_catalog", "float4", "pg_catalog", "text", NULL, 'i', 'i'},
{TSQL_CAST_WITHOUT_FUNC_ENTRY, "pg_catalog", "float4", "pg_catalog", "bpchar", NULL, 'i', 'i'},
{TSQL_CAST_WITHOUT_FUNC_ENTRY, "pg_catalog", "float4", "sys", "bpchar", NULL, 'i', 'i'},
{TSQL_CAST_WITHOUT_FUNC_ENTRY, "pg_catalog", "float4", "pg_catalog", "varchar", NULL, 'i', 'i'},
{TSQL_CAST_WITHOUT_FUNC_ENTRY, "pg_catalog", "float4", "sys", "varchar", NULL, 'i', 'i'},
/* float8 -> string via I/O */
{TSQL_CAST_WITHOUT_FUNC_ENTRY, "pg_catalog", "float8", "pg_catalog", "text", NULL, 'i', 'i'},
{TSQL_CAST_WITHOUT_FUNC_ENTRY, "pg_catalog", "float8", "pg_catalog", "bpchar", NULL, 'i', 'i'},
{TSQL_CAST_WITHOUT_FUNC_ENTRY, "pg_catalog", "float8", "sys", "bpchar", NULL, 'i', 'i'},
{TSQL_CAST_WITHOUT_FUNC_ENTRY, "pg_catalog", "float8", "pg_catalog", "varchar", NULL, 'i', 'i'},
{TSQL_CAST_WITHOUT_FUNC_ENTRY, "pg_catalog", "float8", "sys", "varchar", NULL, 'i', 'i'},
/* numeric -> string via I/O */
{TSQL_CAST_WITHOUT_FUNC_ENTRY, "pg_catalog", "numeric", "pg_catalog", "text", NULL, 'i', 'i'},
{TSQL_CAST_WITHOUT_FUNC_ENTRY, "pg_catalog", "numeric", "pg_catalog", "bpchar", NULL, 'i', 'i'},
{TSQL_CAST_WITHOUT_FUNC_ENTRY, "pg_catalog", "numeric", "sys", "bpchar", NULL, 'i', 'i'},
{TSQL_CAST_WITHOUT_FUNC_ENTRY, "pg_catalog", "numeric", "pg_catalog", "varchar", NULL, 'i', 'i'},
{TSQL_CAST_WITHOUT_FUNC_ENTRY, "pg_catalog", "numeric", "sys", "varchar", NULL, 'i', 'i'},
/* // fixeddecimal -> string via I/O */
{TSQL_CAST_WITHOUT_FUNC_ENTRY, "sys", "fixeddecimal", "pg_catalog", "text", NULL, 'i', 'i'},
{TSQL_CAST_WITHOUT_FUNC_ENTRY, "sys", "fixeddecimal", "pg_catalog", "bpchar", NULL, 'i', 'i'},
{TSQL_CAST_WITHOUT_FUNC_ENTRY, "sys", "fixeddecimal", "sys", "bpchar", NULL, 'i', 'i'},
{TSQL_CAST_WITHOUT_FUNC_ENTRY, "sys", "fixeddecimal", "pg_catalog", "varchar", NULL, 'i', 'i'},
{TSQL_CAST_WITHOUT_FUNC_ENTRY, "sys", "fixeddecimal", "sys", "varchar", NULL, 'i', 'i'},
/* fixeddecimal -> string via I/O */
{TSQL_CAST_WITHOUT_FUNC_ENTRY, "sys", "uniqueidentifier", "pg_catalog", "text", NULL, 'i', 'i'},
{TSQL_CAST_WITHOUT_FUNC_ENTRY, "sys", "uniqueidentifier", "pg_catalog", "bpchar", NULL, 'i', 'i'},
{TSQL_CAST_WITHOUT_FUNC_ENTRY, "sys", "uniqueidentifier", "sys", "bpchar", NULL, 'i', 'i'},
{TSQL_CAST_WITHOUT_FUNC_ENTRY, "sys", "uniqueidentifier", "pg_catalog", "varchar", NULL, 'i', 'i'},
{TSQL_CAST_WITHOUT_FUNC_ENTRY, "sys", "uniqueidentifier", "sys", "varchar", NULL, 'i', 'i'},
/* oid -> int4 */
{TSQL_CAST_WITHOUT_FUNC_ENTRY, "pg_catalog", "oid", "pg_catalog", "int4", NULL, 'i', 'b'},
{TSQL_CAST_WITHOUT_FUNC_ENTRY, "pg_catalog", "oid", "pg_catalog", "text", NULL, 'i', 'i'},
/* text */
{TSQL_CAST_WITHOUT_FUNC_ENTRY, "sys", "rowversion", "pg_catalog", "text", NULL, 'i', 'i'},
{TSQL_CAST_WITHOUT_FUNC_ENTRY, "pg_catalog", "timestamp", "pg_catalog", "text", NULL, 'i', 'i'},
{TSQL_CAST_WITHOUT_FUNC_ENTRY, "pg_catalog", "timestamptz", "pg_catalog", "text", NULL, 'i', 'i'},
{TSQL_CAST_WITHOUT_FUNC_ENTRY, "sys", "varbinary", "pg_catalog", "text", NULL, 'i', 'i'},
{TSQL_CAST_WITHOUT_FUNC_ENTRY, "sys", "bbf_varbinary", "pg_catalog", "text", NULL, 'i', 'i'},
{TSQL_CAST_WITHOUT_FUNC_ENTRY, "sys", "sql_variant", "pg_catalog", "text", NULL, 'i', 'i'},
{TSQL_CAST_WITHOUT_FUNC_ENTRY, "pg_catalog", "date", "pg_catalog", "text", NULL, 'i', 'i'},
{TSQL_CAST_WITHOUT_FUNC_ENTRY, "sys", "datetime", "pg_catalog", "text", NULL, 'i', 'i'},
{TSQL_CAST_WITHOUT_FUNC_ENTRY, "sys", "datetime2", "pg_catalog", "text", NULL, 'i', 'i'},
{TSQL_CAST_WITHOUT_FUNC_ENTRY, "sys", "smalldatetime", "pg_catalog", "text", NULL, 'i', 'i'},
{TSQL_CAST_WITHOUT_FUNC_ENTRY, "sys", "bit", "pg_catalog", "text", NULL, 'i', 'i'},
{TSQL_CAST_WITHOUT_FUNC_ENTRY, "sys", "binary", "pg_catalog", "text", NULL, 'i', 'i'},
{TSQL_CAST_WITHOUT_FUNC_ENTRY, "sys", "bbf_binary", "pg_catalog", "text", NULL, 'i', 'i'},
{TSQL_CAST_WITHOUT_FUNC_ENTRY, "pg_catalog", "bytea", "pg_catalog", "text", NULL, 'i', 'i'},
{TSQL_CAST_WITHOUT_FUNC_ENTRY, "sys", "datetimeoffset", "pg_catalog", "text", NULL, 'i', 'i'},
{TSQL_CAST_WITHOUT_FUNC_ENTRY, "pg_catalog", "time", "pg_catalog", "text", NULL, 'i', 'i'},
};
#define TOTAL_TSQL_CAST_COUNT (sizeof(tsql_cast_raw_infos)/sizeof(tsql_cast_raw_infos[0]))
typedef struct tsql_precedence_info
{
int precedence;
const char *nsp;
const char *typname;
} tsql_precedence_info_t;
tsql_precedence_info_t tsql_precedence_infos[] =
{
{0, "sys", "sql_variant"},
{1, "sys", "datetimeoffset"},
{2, "sys", "datetime2"},
{3, "sys", "datetime"},
{4, "sys", "smalldatetime"},
{5, "pg_catalog", "date"},
{6, "pg_catalog", "time"},
{7, "pg_catalog", "float8"},
{8, "pg_catalog", "float4"},
{9, "pg_catalog", "numeric"},
{10, "sys", "fixeddecimal"},
{11, "sys", "money"},
{12, "sys", "smallmoney"},
{13, "pg_catalog", "int8"},
{14, "pg_catalog", "int4"},
{15, "pg_catalog", "int2"},
{16, "sys", "tinyint"},
{17, "sys", "bit"},
{18, "sys", "ntext"},
{19, "pg_catalog", "text"},
{20, "sys", "image"},
{21, "sys", "timestamp"},
{22, "sys", "uniqueidentifier"},
{23, "sys", "nvarchar"},
{24, "sys", "nchar"},
{25, "sys", "varchar"},
{26, "pg_catalog", "varchar"},
{27, "pg_catalog", "char"},
{28, "sys", "bpchar"},
{29, "pg_catalog", "bpchar"},
{30, "pg_catalog", "name"}, /* pg_catalog.name is depriotized than any
* other string datatype not to be looked up
* unless requested explicitly */
{31, "sys", "bbf_varbinary"},
{32, "sys", "varbinary"},
{33, "sys", "bbf_binary"},
{34, "sys", "binary"},
{35, "pg_catalog", "bytea"} /* pg_catalog.bytea is depriotized than any
* other binary datatype not to be looked up
* unless requested explicitly */
};
#define TOTAL_TSQL_PRECEDENCE_COUNT (sizeof(tsql_precedence_infos)/sizeof(tsql_precedence_infos[0]))
/* T-SQL Cast */
typedef struct tsql_cast_info_key
{
Oid castsource;
Oid casttarget;
} tsql_cast_info_key_t;
typedef struct tsql_cast_info_entry
{
Oid castsource;
Oid casttarget;
Oid castfunc;
char castcontext;
char castmethod;
} tsql_cast_info_entry_t;
static tsql_cast_info_key_t *tsql_cast_info_keys = NULL;
static tsql_cast_info_entry_t *tsql_cast_info_entries = NULL;
static HTAB *ht_tsql_cast_info = NULL;
bool inited_ht_tsql_cast_info = false;
static CoercionPathType
tsql_find_coercion_pathway(Oid sourceTypeId, Oid targetTypeId, CoercionContext ccontext, Oid *funcid)
{
tsql_cast_info_key_t key;
tsql_cast_info_entry_t *entry;
CoercionContext castcontext;
CoercionPathType result = COERCION_PATH_NONE;
/* check if any of source/target type is sql variant */
HeapTuple tuple;
bool isSqlVariantCast = false;
bool isInt8Type = false;
bool isInt8ToMoney = false;
Oid typeIds[2] = {sourceTypeId, targetTypeId};
for (int i = 0; i < 2; i++)
{
tuple = SearchSysCache1(TYPEOID, ObjectIdGetDatum(typeIds[i]));
if (HeapTupleIsValid(tuple))
{
Form_pg_type typtup = (Form_pg_type) GETSTRUCT(tuple);
Oid type_nsoid;
char *type_name;
char *type_nsname;
type_nsoid = typtup->typnamespace;
type_nsname = get_namespace_name(type_nsoid);
type_name = NameStr(typtup->typname);
/* We've found INT8 to MONEY casting */
if (isInt8Type && strcmp(type_nsname, "sys") == 0 && ((strcmp(type_name, "money") == 0) || (strcmp(type_name, "smallmoney") == 0)))
isInt8ToMoney = true;
/* Check if type is INT8 */
if (strcmp(type_nsname, "pg_catalog") == 0 && strcmp(type_name, "int8") == 0)
isInt8Type = true;
/* We've found a SQL Variant Casting */
if (strcmp(type_nsname, "sys") == 0 && strcmp(type_name, "sql_variant") == 0)
{
isSqlVariantCast = true;
ReleaseSysCache(tuple);
break;
}
ReleaseSysCache(tuple);
}
}
/* Perhaps the types are domains; if so, look at their base types */
if (!isSqlVariantCast)
{
if (OidIsValid(sourceTypeId))
sourceTypeId = getBaseType(sourceTypeId);
/*
* if we are casting from INT8 to MONEY, don't look for base type of
* target so that it can call the cast function which matches with the
* exact types
*/
if (OidIsValid(targetTypeId) && !isInt8ToMoney)
targetTypeId = getBaseType(targetTypeId);
}
key.castsource = sourceTypeId;
key.casttarget = targetTypeId;
/* Initialise T-SQL coercion hash table if not already done */
if (!inited_ht_tsql_cast_info)
{
FunctionCallInfo fcinfo = NULL; /* empty interface */
init_tsql_coerce_hash_tab(fcinfo);
}
entry = (tsql_cast_info_entry_t *) hash_search(ht_tsql_cast_info, &key, HASH_FIND, NULL);
if (entry == NULL)
return COERCION_PATH_NONE;
switch (entry->castcontext)
{
case COERCION_CODE_IMPLICIT:
castcontext = COERCION_IMPLICIT;
break;
case COERCION_CODE_ASSIGNMENT:
castcontext = COERCION_ASSIGNMENT;
break;
case COERCION_CODE_EXPLICIT:
castcontext = COERCION_EXPLICIT;
break;
default:
elog(ERROR, "unrecognized castcontext: %d",
(int) entry->castcontext);
castcontext = 0; /* keep compiler quiet */
break;
}
/* Rely on ordering of enum for correct behavior here */
if (ccontext >= castcontext)
{
switch (entry->castmethod)
{
case COERCION_METHOD_FUNCTION:
result = COERCION_PATH_FUNC;
*funcid = entry->castfunc;
break;
case COERCION_METHOD_INOUT:
result = COERCION_PATH_COERCEVIAIO;
break;
case COERCION_METHOD_BINARY:
result = COERCION_PATH_RELABELTYPE;
break;
default:
elog(ERROR, "unrecognized castmethod: %d",
(int) entry->castmethod);
break;
}
}
return result;
}
Datum
init_tsql_coerce_hash_tab(PG_FUNCTION_ARGS)
{
HASHCTL hashCtl;
MemoryContext oldContext;
void *value;
tsql_cast_info_key_t *key;
tsql_cast_info_entry_t *entry;
Oid sys_nspoid = get_namespace_oid("sys", true);
Oid *argTypes;
TSQLInstrumentation(INSTR_TSQL_INIT_TSQL_COERCE_HASH_TAB);
/* Register Hooks */
find_coercion_pathway_hook = tsql_find_coercion_pathway;
if (!OidIsValid(sys_nspoid))
PG_RETURN_INT32(0);
if (pltsql_coercion_context == NULL) /* initialize memory context */
{
pltsql_coercion_context = AllocSetContextCreateInternal(NULL,
"PLTSQL CoercionMemory Context",
ALLOCSET_DEFAULT_SIZES);
}
/* create internal table */
oldContext = MemoryContextSwitchTo(pltsql_coercion_context);
if (tsql_cast_info_keys == NULL)
tsql_cast_info_keys = palloc0(sizeof(tsql_cast_info_key_t) * (TOTAL_TSQL_CAST_COUNT));
if (tsql_cast_info_entries == NULL)
tsql_cast_info_entries = palloc0(sizeof(tsql_cast_info_entry_t) * (TOTAL_TSQL_CAST_COUNT));
MemoryContextSwitchTo(oldContext);
/* create hash table */
if (ht_tsql_cast_info == NULL)
{
MemSet(&hashCtl, 0, sizeof(hashCtl));
hashCtl.keysize = sizeof(tsql_cast_info_key_t);
hashCtl.entrysize = sizeof(tsql_cast_info_entry_t);
hashCtl.hcxt = pltsql_coercion_context;
ht_tsql_cast_info = hash_create("T-SQL cast",
SPI_processed,
&hashCtl,
HASH_ELEM | HASH_CONTEXT | HASH_BLOBS);
}
/* mark the hash table initialised */
inited_ht_tsql_cast_info = true;
/*
* Below array will be used to provide argument types to buildoidvector
* function. A cast function can have 3 arguments: source datatype, typmod
* (int4) and cast context (bool), so we prepare the array here with last
* two values prefilled and source datatype oid will be filled when
* required.
*/
argTypes = (Oid *) palloc(3 * sizeof(Oid));
argTypes[1] = INT4OID;
argTypes[2] = BOOLOID;
for (int i = 0; i < TOTAL_TSQL_CAST_COUNT; i++)
{
Oid castsource;
Oid casttarget;
Oid srcnspoid;
Oid tarnspoid;
key = &(tsql_cast_info_keys[i]);
entry = &(tsql_cast_info_entries[i]);
srcnspoid = strcmp(tsql_cast_raw_infos[i].srcnsp, "sys") == 0 ? sys_nspoid : PG_CATALOG_NAMESPACE;
castsource = GetSysCacheOid2(TYPENAMENSP, Anum_pg_type_oid,
CStringGetDatum(tsql_cast_raw_infos[i].srctypname), ObjectIdGetDatum(srcnspoid));
tarnspoid = strcmp(tsql_cast_raw_infos[i].tarnsp, "sys") == 0 ? sys_nspoid : PG_CATALOG_NAMESPACE;
casttarget = GetSysCacheOid2(TYPENAMENSP, Anum_pg_type_oid,
CStringGetDatum(tsql_cast_raw_infos[i].tartypname), ObjectIdGetDatum(tarnspoid));
if (OidIsValid(casttarget) && OidIsValid(castsource))
{
HeapTuple tuple;
Form_pg_cast castForm;
key->casttarget = casttarget;
entry->casttarget = casttarget;
key->castsource = castsource;
entry->castsource = castsource;
switch (tsql_cast_raw_infos[i].casttype)
{
case PG_CAST_ENTRY:
tuple = SearchSysCache2(CASTSOURCETARGET,
ObjectIdGetDatum(castsource),
ObjectIdGetDatum(casttarget));
if (HeapTupleIsValid(tuple))
{
castForm = (Form_pg_cast) GETSTRUCT(tuple);
entry->castfunc = castForm->castfunc;
ReleaseSysCache(tuple);
}
else
{
/* function is not loaded. wait for next scan */
inited_ht_tsql_cast_info = false;
continue;
}
break;
case TSQL_CAST_ENTRY:
entry->castfunc = GetSysCacheOid3(PROCNAMEARGSNSP, Anum_pg_proc_oid,
CStringGetDatum(tsql_cast_raw_infos[i].castfunc),
PointerGetDatum(buildoidvector(&castsource, 1)),
ObjectIdGetDatum(sys_nspoid));
if (!OidIsValid(entry->castfunc))
{
/* also search cast function with 3 input arguments */
argTypes[0] = castsource;
entry->castfunc = GetSysCacheOid3(PROCNAMEARGSNSP, Anum_pg_proc_oid,
CStringGetDatum(tsql_cast_raw_infos[i].castfunc),
PointerGetDatum(buildoidvector(argTypes, 3)),
ObjectIdGetDatum(sys_nspoid));
if (!OidIsValid(entry->castfunc))
{
/* function is not loaded. wait for next scan */
inited_ht_tsql_cast_info = false;
continue;
}
}
break;
case TSQL_CAST_WITHOUT_FUNC_ENTRY:
entry->castfunc = 0;
break;
default:
ereport(ERROR,
(errcode(ERRCODE_INTERNAL_ERROR),
errmsg("Unrecognized Cast Behavior")));
break;
}
entry->castcontext = tsql_cast_raw_infos[i].castcontext;
entry->castmethod = tsql_cast_raw_infos[i].castmethod;
value = hash_search(ht_tsql_cast_info, key, HASH_ENTER, NULL);
*(tsql_cast_info_entry_t *) value = *entry;
}
}
PG_RETURN_INT32(0);
}
/* T-SQL Precedence */
typedef struct tsql_datatype_precedence_info_entry
{
Oid typ;
int32 precedence;
} tsql_datatype_precedence_info_entry_t;
static tsql_datatype_precedence_info_entry_t *tsql_datatype_precedence_info_entries = NULL;
static HTAB *ht_tsql_datatype_precedence_info = NULL;
bool inited_ht_tsql_datatype_precedence_info = false;
/*
* smaller value has higher precedence
* for unknown, return -1. (assume it is a user-defined type)
*/
static int
tsql_get_type_precedence(Oid typeId)
{
tsql_datatype_precedence_info_entry_t *entry;
/* Initialise T-SQL datatype precedence hash table if not already done */
if (!inited_ht_tsql_datatype_precedence_info)
{
FunctionCallInfo fcinfo = NULL; /* empty interface */
init_tsql_datatype_precedence_hash_tab(fcinfo);
}
entry = (tsql_datatype_precedence_info_entry_t *) hash_search(ht_tsql_datatype_precedence_info, &typeId, HASH_FIND, NULL);
if (entry == NULL)
return -1;
return entry->precedence;
}
static bool
tsql_has_higher_precedence(Oid typeId1, Oid typeId2)
{
int type1_precedence;
int type2_precedence;
type1_precedence = tsql_get_type_precedence(typeId1);
type2_precedence = tsql_get_type_precedence(typeId2);
return type1_precedence < type2_precedence;
}
static bool
is_vectorized_binary_operator(FuncCandidateList candidate)
{
Oid argoid = InvalidOid;
HeapTuple tup = NULL;
Assert(candidate);
if (candidate->nargs != 2)
return false;
if (candidate->nvargs > 0)
return false;
argoid = candidate->args[0];
for (int i = 1; i < candidate->nargs; ++i)
if (argoid != candidate->args[i])
return false;
/* look-up syscache to check candidate is a valid operator */
tup = SearchSysCache1(OPEROID, ObjectIdGetDatum(candidate->oid));
if (!HeapTupleIsValid(tup))
return false;
ReleaseSysCache(tup);
return true;
}
static bool
tsql_has_func_args_higher_precedence(int n, Oid *inputtypes, FuncCandidateList candidate1, FuncCandidateList candidate2, bool candidates_are_opers)
{
int i;
Oid *argtypes1 = candidate1->args;
Oid *argtypes2 = candidate2->args;
bool can1_is_sametype = true;
bool can2_is_sametype = true;
/*
* There is no public documentation how T-SQL chooses the best candidate.
* Let's use a simple heuristic based on type precedence to resolve
* ambiguity.
*
* Please note that other more important criteria such as (# of exact
* matching types) should be already handled by PG backend. So we don't
* need to consider it here.
*
* Please note that there still can be an ambiguous case. i.e. input is
* (int,int) but candidate 1 is (int,bigint) and candidate 2 is
* (bigint,int)
*/
if (is_vectorized_binary_operator(candidate1) && !is_vectorized_binary_operator(candidate2))
return true;
/* Prioritize candidates with same-typed arguments for operators only*/
if (candidates_are_opers)
{
for (i = 1; i < n; ++i)
{
can1_is_sametype &= argtypes1[i-1] == argtypes1[i];
can2_is_sametype &= argtypes2[i-1] == argtypes2[i];
}
if (can2_is_sametype != can1_is_sametype)
return can1_is_sametype;
}
for (i = 0; i < n; ++i)
{
if (argtypes1[i] == argtypes2[i])
continue;
if (tsql_has_higher_precedence(argtypes1[i], argtypes2[i]))
continue;
return false;
}
return true;
}
static FuncCandidateList
deep_copy_func_candidate(FuncCandidateList in)
{
/* deep copy single func-candidate except pointer to a next func-candidate */
FuncCandidateList out;
out = (FuncCandidateList) palloc(sizeof(struct _FuncCandidateList) + in->nargs * sizeof(Oid));
memcpy(out, in, sizeof(struct _FuncCandidateList) + in->nargs * sizeof(Oid));
out->next = NULL;
return out;
}
static FuncCandidateList
run_tsql_best_match_heuristics(int nargs, Oid *input_typeids, FuncCandidateList candidates)
{
FuncCandidateList new_candidates = NULL;
Oid input_base_typeids[FUNC_MAX_ARGS];
int i;
int nmatch;
int nbestMatch;
FuncCandidateList current_candidate;
FuncCandidateList last_candidate;
Oid *current_typeids;
for (i = 0; i < nargs; i++)
{
if (input_typeids[i] != UNKNOWNOID)
input_base_typeids[i] = getBaseType(input_typeids[i]);
else
{
/* no need to call getBaseType on UNKNOWNOID */
input_base_typeids[i] = UNKNOWNOID;
}
}
/*
* Run through all candidates and keep those with the most matches on
* exact types. Keep all candidates if none match.
*/
nbestMatch = 0;
last_candidate = NULL;
for (current_candidate = candidates;
current_candidate != NULL;
current_candidate = current_candidate->next)
{
current_typeids = current_candidate->args;
nmatch = 0;
for (i = 0; i < nargs; i++)
{
if (input_base_typeids[i] != UNKNOWNOID &&
(current_typeids[i] == input_base_typeids[i] ||
current_typeids[i] == input_typeids[i])) /* this is the
* difference from PG */
nmatch++;
}
/* take this one as the best choice so far? */
if ((nmatch > nbestMatch) || (last_candidate == NULL))
{
nbestMatch = nmatch;
new_candidates = deep_copy_func_candidate(current_candidate);
last_candidate = new_candidates;
}
/* no worse than the last choice, so keep this one too? */
else if (nmatch == nbestMatch)
{
last_candidate->next = deep_copy_func_candidate(current_candidate);
last_candidate = last_candidate->next;
}
/* otherwise, don't bother keeping this one... */
}
return new_candidates;
}
static FuncCandidateList
tsql_func_select_candidate(int nargs,
Oid *input_typeids,
FuncCandidateList candidates,
bool unknowns_resolved)
{
FuncCandidateList new_candidates;
FuncCandidateList current_candidate;
FuncCandidateList another_candidate;
int i;
bool candidates_are_opers = false;
if (unknowns_resolved)
{
Oid *new_input_typeids = palloc(nargs * sizeof(Oid));
Oid sys_varcharoid = get_sys_varcharoid();
/*
* For unknown literals, try the following orders: varchar -> text ->
* others
*/
for (i = 0; i < nargs; i++)
{
new_input_typeids[i] = (input_typeids[i] == UNKNOWNOID) ? sys_varcharoid : input_typeids[i];
}
current_candidate = func_select_candidate(nargs, new_input_typeids, candidates);
if (current_candidate)
{
int n_poly_args = 0;
for (i = 0; i < nargs; i++)
if (input_typeids[i] == UNKNOWNOID && IsPolymorphicType(current_candidate->args[i]))
++n_poly_args;
if (n_poly_args == 0)
return current_candidate;
}
/*
* TODO: PG doens't blindly use TEXT datatype for UNKNOWNOID. It is
* based on its category and preffered datatype. It's not clear to
* follow the same policy in babelfish. For now, simply always
* choosing TEXT datatype here.
*/
for (i = 0; i < nargs; i++)
{
new_input_typeids[i] = (input_typeids[i] == UNKNOWNOID) ? TEXTOID : input_typeids[i];
}
/*
* UNKNOWNOID was overwritten to TEXTOID. apply the PG logic again to
* find the candidate
*/
return func_select_candidate(nargs, new_input_typeids, candidates);
}
new_candidates = run_tsql_best_match_heuristics(nargs, input_typeids, candidates);
candidates_are_opers = SearchSysCacheExists1(OPEROID, new_candidates->oid);
for (current_candidate = new_candidates;
current_candidate != NULL;
current_candidate = current_candidate->next)
{
bool has_highest_precedence = true;
for (another_candidate = new_candidates;
another_candidate != NULL;
another_candidate = another_candidate->next)
{
if (!tsql_has_func_args_higher_precedence(nargs, input_typeids, current_candidate, another_candidate, candidates_are_opers))
{
has_highest_precedence = false;
break;
}
}
if (has_highest_precedence)
{
current_candidate->next = NULL;
return current_candidate;
}
}
/*
* can't find the function which beats all the other functions. still
* ambiguous.
*/
return NULL;
}
static bool
is_tsql_char_type_with_len(Oid type)
{
common_utility_plugin *utilptr = common_utility_plugin_ptr;
return utilptr->is_tsql_bpchar_datatype(type) ||
utilptr->is_tsql_nchar_datatype(type) ||
utilptr->is_tsql_varchar_datatype(type) ||
utilptr->is_tsql_nvarchar_datatype(type);
}
static Node *
tsql_coerce_string_literal_hook(ParseCallbackState *pcbstate, Oid targetTypeId,
int32 targetTypeMod, int32 baseTypeMod,
Const *newcon, char *value,
CoercionContext ccontext, CoercionForm cformat,
int location)
{
Oid baseTypeId = newcon->consttype;
Type baseType = typeidType(baseTypeId);
int32 inputTypeMod = newcon->consttypmod;
if (newcon->constisnull)
{
newcon->constvalue = stringTypeDatum(baseType, NULL, inputTypeMod);
}
else
{
int i;
if (ccontext != COERCION_EXPLICIT)
{
/*
* T-SQL forbids implicit casting from string literal to certain
* datatypes (i.e. binary, varbinary)
*/
if ((*common_utility_plugin_ptr->is_tsql_binary_datatype) (baseTypeId))
ereport(ERROR,
(errcode(ERRCODE_CANNOT_COERCE),
errmsg("cannot coerce string literal to binary datatype")));
if ((*common_utility_plugin_ptr->is_tsql_varbinary_datatype) (baseTypeId))
ereport(ERROR,
(errcode(ERRCODE_CANNOT_COERCE),