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ddl, expression: fix some string functions' flen and refine error message for expression index #27376

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merged 14 commits into from
Aug 20, 2021
Merged

ddl, expression: fix some string functions' flen and refine error message for expression index #27376

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done
wjhuang2016 Aug 19, 2021
1998c43
fix test
wjhuang2016 Aug 19, 2021
f80b988
fix
wjhuang2016 Aug 19, 2021
bbb3061
fix
wjhuang2016 Aug 19, 2021
45c29c1
Merge branch 'master' into fix_strfuc_flen
wjhuang2016 Aug 20, 2021
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wjhuang2016 Aug 20, 2021
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AilinKid Aug 20, 2021
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wjhuang2016 Aug 20, 2021
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Merge branch 'master' into fix_strfuc_flen
ti-chi-bot Aug 20, 2021
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Merge branch 'master' into fix_strfuc_flen
wjhuang2016 Aug 20, 2021
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13 changes: 13 additions & 0 deletions cmd/explaintest/r/explain_generate_column_substitute.result
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Original file line number Diff line number Diff line change
Expand Up @@ -496,3 +496,16 @@ desc format = 'brief' select b from t;
id estRows task access object operator info
IndexReader 10000.00 root index:IndexFullScan
└─IndexFullScan 10000.00 cop[tikv] table:t, index:b(b) keep order:false, stats:pseudo
create table t01(a varchar(20));
insert into t01 values ("齆斮聒蚆髙锐潊贩哨啅捸爖斥圱犳飁綴纜牖蚙");
alter table t01 add index eidx ((concat_ws('expression_index', a, 'test')));
select * from t01 use index (eidx) where (concat_ws('expression_index', a, 'test')) not like (concat_ws('expression_index', "齆斮聒蚆髙锐潊贩哨啅捸爖斥圱犳飁綴纜牖蚙", 'test'));
a
insert into t01 values ("齆斮聒蚆髙锐潊贩哨啅捸爖斥圱犳飁綴纜牖蚙");
select * from t01 use index (eidx) where (concat_ws('expression_index', a, 'test')) like (concat_ws('expression_index', "齆斮聒蚆髙锐潊贩哨啅捸爖斥圱犳飁綴纜牖蚙", 'test'));
a
齆斮聒蚆髙锐潊贩哨啅捸爖斥圱犳飁綴纜牖蚙
齆斮聒蚆髙锐潊贩哨啅捸爖斥圱犳飁綴纜牖蚙
drop table if exists t1;
create table t1(a char, b varchar(20), c char, d varchar(20));
alter table t1 add index eidx ((export_set(3, a, c, ',', 5)));
11 changes: 11 additions & 0 deletions cmd/explaintest/t/explain_generate_column_substitute.test
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Expand Up @@ -216,3 +216,14 @@ drop table if exists t;
create table t(a int, b int as (a+1), key((a+1)), key(b));
desc format = 'brief' select a+1 from t;
desc format = 'brief' select b from t;

create table t01(a varchar(20));
insert into t01 values ("齆斮聒蚆髙锐潊贩哨啅捸爖斥圱犳飁綴纜牖蚙");
alter table t01 add index eidx ((concat_ws('expression_index', a, 'test')));
select * from t01 use index (eidx) where (concat_ws('expression_index', a, 'test')) not like (concat_ws('expression_index', "齆斮聒蚆髙锐潊贩哨啅捸爖斥圱犳飁綴纜牖蚙", 'test'));
insert into t01 values ("齆斮聒蚆髙锐潊贩哨啅捸爖斥圱犳飁綴纜牖蚙");
select * from t01 use index (eidx) where (concat_ws('expression_index', a, 'test')) like (concat_ws('expression_index', "齆斮聒蚆髙锐潊贩哨啅捸爖斥圱犳飁綴纜牖蚙", 'test'));

drop table if exists t1;
create table t1(a char, b varchar(20), c char, d varchar(20));
alter table t1 add index eidx ((export_set(3, a, c, ',', 5)));
2 changes: 2 additions & 0 deletions ddl/error.go
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Original file line number Diff line number Diff line change
Expand Up @@ -295,4 +295,6 @@ var (
errFunctionalIndexOnJSONOrGeometryFunction = dbterror.ClassDDL.NewStd(mysql.ErrFunctionalIndexOnJSONOrGeometryFunction)
// errDependentByFunctionalIndex returns when the dropped column depends by expression index.
errDependentByFunctionalIndex = dbterror.ClassDDL.NewStd(mysql.ErrDependentByFunctionalIndex)
// errFunctionalIndexOnBlob when the expression of expression index returns blob or text.
errFunctionalIndexOnBlob = dbterror.ClassDDL.NewStd(mysql.ErrFunctionalIndexOnBlob)
)
3 changes: 3 additions & 0 deletions ddl/index.go
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Expand Up @@ -140,6 +140,9 @@ func checkIndexColumn(col *model.ColumnInfo, indexColumnLen int) error {
// Length must be specified and non-zero for BLOB and TEXT column indexes.
if types.IsTypeBlob(col.FieldType.Tp) {
if indexColumnLen == types.UnspecifiedLength {
if col.Hidden {
return errFunctionalIndexOnBlob
}
return errors.Trace(errBlobKeyWithoutLength.GenWithStackByArgs(col.Name.O))
}
if indexColumnLen == types.ErrorLength {
Expand Down
2 changes: 1 addition & 1 deletion errno/errcode.go
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Expand Up @@ -891,7 +891,7 @@ const (
ErrFunctionalIndexRefAutoIncrement = 3754
ErrCannotDropColumnFunctionalIndex = 3755
ErrFunctionalIndexPrimaryKey = 3756
ErrFunctionalIndexOnLob = 3757
ErrFunctionalIndexOnBlob = 3757
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ErrFunctionalIndexFunctionIsNotAllowed = 3758
ErrFulltextFunctionalIndex = 3759
ErrSpatialFunctionalIndex = 3760
Expand Down
2 changes: 1 addition & 1 deletion errno/errname.go
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Expand Up @@ -887,7 +887,7 @@ var MySQLErrName = map[uint16]*mysql.ErrMessage{
ErrFunctionalIndexRefAutoIncrement: mysql.Message("Expression index '%s' cannot refer to an auto-increment column", nil),
ErrCannotDropColumnFunctionalIndex: mysql.Message("Cannot drop column '%s' because it is used by an expression index. In order to drop the column, you must remove the expression index", nil),
ErrFunctionalIndexPrimaryKey: mysql.Message("The primary key cannot be an expression index", nil),
ErrFunctionalIndexOnLob: mysql.Message("Cannot create an expression index on an expression that returns a BLOB or TEXT. Please consider using CAST", nil),
ErrFunctionalIndexOnBlob: mysql.Message("Cannot create an expression index on an expression that returns a BLOB or TEXT. Please consider using CAST", nil),
ErrFunctionalIndexFunctionIsNotAllowed: mysql.Message("Expression of expression index '%s' contains a disallowed function", nil),
ErrFulltextFunctionalIndex: mysql.Message("Fulltext expression index is not supported", nil),
ErrSpatialFunctionalIndex: mysql.Message("Spatial expression index is not supported", nil),
Expand Down
27 changes: 19 additions & 8 deletions expression/builtin_string.go
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Expand Up @@ -366,8 +366,8 @@ func (c *concatWSFunctionClass) getFunction(ctx sessionctx.Context, args []Expre
bf.tp.Flen = mysql.MaxBlobWidth
logutil.BgLogger().Warn("unexpected `Flen` value(-1) in CONCAT_WS's args", zap.Int("arg's index", i))
}
bf.tp.Flen += argType.Flen
}
bf.tp.Flen += argType.Flen
}

// add separator
Expand Down Expand Up @@ -1588,8 +1588,8 @@ func (c *hexFunctionClass) getFunction(ctx sessionctx.Context, args []Expression
return nil, err
}
bf.tp.Charset, bf.tp.Collate = ctx.GetSessionVars().GetCharsetInfo()
// Use UTF-8 as default
bf.tp.Flen = args[0].GetType().Flen * 3 * 2
// Use UTF8MB4 as default.
bf.tp.Flen = args[0].GetType().Flen * 4 * 2
sig := &builtinHexStrArgSig{bf}
sig.setPbCode(tipb.ScalarFuncSig_HexStrArg)
return sig, nil
Expand Down Expand Up @@ -1665,10 +1665,10 @@ func (c *unhexFunctionClass) getFunction(ctx sessionctx.Context, args []Expressi
argEvalTp := argType.EvalType()
switch argEvalTp {
case types.ETString, types.ETDatetime, types.ETTimestamp, types.ETDuration, types.ETJson:
// Use UTF-8 as default charset, so there're (Flen * 3 + 1) / 2 byte-pairs
retFlen = (argType.Flen*3 + 1) / 2
// Use UTF8MB4 as default charset, so there're (Flen * 4 + 1) / 2 byte-pairs.
retFlen = (argType.Flen*4 + 1) / 2
case types.ETInt, types.ETReal, types.ETDecimal:
// For number value, there're (Flen + 1) / 2 byte-pairs
// For number value, there're (Flen + 1) / 2 byte-pairs.
retFlen = (argType.Flen + 1) / 2
default:
return nil, errors.Errorf("Unhex invalid args, need int or string but get %s", argType)
Expand Down Expand Up @@ -3073,7 +3073,10 @@ func (c *exportSetFunctionClass) getFunction(ctx sessionctx.Context, args []Expr
if err != nil {
return nil, err
}
bf.tp.Flen = mysql.MaxBlobWidth
// Max length is (64 * 2 -1) * 4
// For example:
// "Y,Y,Y,Y,N,N,N,N,N,N,N,N,N,N,N,N,N,N,N,N,N,N,N,N,N,N,N,N,N,N,N,N,N,N,N,N,N,N,N,N,N,N,N,N,N,N,N,N,N,N,N,N,N,N,N,N,N,N,N,N,N,N,N,N"
bf.tp.Flen = 508
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What will happen if arg[1]/arg[2] is too long?
I think using the formula in mysql is better.. https://github.com/mysql/mysql-server/blob/8.0/sql/item_strfunc.cc#L3646

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OK, I will fix it.

switch len(args) {
case 3:
sig = &builtinExportSet3ArgSig{bf}
Expand Down Expand Up @@ -3407,7 +3410,15 @@ func (c *fromBase64FunctionClass) getFunction(ctx sessionctx.Context, args []Exp
if err != nil {
return nil, err
}
bf.tp.Flen = mysql.MaxBlobWidth
// The calculation of Flen is the same as MySQL.
if args[0].GetType().Flen == types.UnspecifiedLength {
bf.tp.Flen = types.UnspecifiedLength
} else {
bf.tp.Flen = args[0].GetType().Flen * 3
if bf.tp.Flen > mysql.MaxBlobWidth {
bf.tp.Flen = mysql.MaxBlobWidth
}
}

valStr, _ := ctx.GetSessionVars().GetSystemVar(variable.MaxAllowedPacket)
maxAllowedPacket, err := strconv.ParseUint(valStr, 10, 64)
Expand Down
46 changes: 23 additions & 23 deletions expression/typeinfer_test.go
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Expand Up @@ -244,8 +244,8 @@ func (s *testInferTypeSuite) createTestCase4StrFuncs() []typeInferTestCase {
{"CONCAT(c_bchar, 0x80)", mysql.TypeVarString, charset.CharsetUTF8MB4, 0, 23, types.UnspecifiedLength},
{"CONCAT('T', 'i', 'DB')", mysql.TypeVarString, charset.CharsetUTF8MB4, 0 | mysql.NotNullFlag, 4, types.UnspecifiedLength},
{"CONCAT('T', 'i', 'DB', c_binary)", mysql.TypeVarString, charset.CharsetBin, mysql.BinaryFlag, 24, types.UnspecifiedLength},
{"CONCAT_WS('-', 'T', 'i', 'DB')", mysql.TypeVarString, charset.CharsetUTF8MB4, 0 | mysql.NotNullFlag, 6, types.UnspecifiedLength},
{"CONCAT_WS(',', 'TiDB', c_binary)", mysql.TypeVarString, charset.CharsetBin, mysql.BinaryFlag, 25, types.UnspecifiedLength},
{"CONCAT_WS('-', 'T', 'i', 'DB')", mysql.TypeVarString, charset.CharsetUTF8MB4, 0 | mysql.NotNullFlag, 7, types.UnspecifiedLength},
{"CONCAT_WS(',', 'TiDB', c_binary)", mysql.TypeVarString, charset.CharsetBin, mysql.BinaryFlag, 26, types.UnspecifiedLength},
{"left(c_int_d, c_int_d)", mysql.TypeVarString, charset.CharsetUTF8MB4, 0, 20, types.UnspecifiedLength},
{"right(c_int_d, c_int_d)", mysql.TypeVarString, charset.CharsetUTF8MB4, 0, 20, types.UnspecifiedLength},
{"lower(c_int_d)", mysql.TypeVarString, charset.CharsetUTF8MB4, 0, 20, types.UnspecifiedLength},
Expand All @@ -261,10 +261,10 @@ func (s *testInferTypeSuite) createTestCase4StrFuncs() []typeInferTestCase {
{"bit_length(c_char)", mysql.TypeLonglong, charset.CharsetBin, mysql.BinaryFlag, 10, 0},
{"substring_index(c_int_d, '.', 1)", mysql.TypeVarString, charset.CharsetUTF8MB4, 0, 20, types.UnspecifiedLength},
{"substring_index(c_binary, '.', 1)", mysql.TypeVarString, charset.CharsetBin, mysql.BinaryFlag, 20, types.UnspecifiedLength},
{"hex(c_char)", mysql.TypeVarString, charset.CharsetUTF8MB4, 0, 120, types.UnspecifiedLength},
{"hex(c_char)", mysql.TypeVarString, charset.CharsetUTF8MB4, 0, 160, types.UnspecifiedLength},
{"hex(c_int_d)", mysql.TypeVarString, charset.CharsetUTF8MB4, 0, 22, types.UnspecifiedLength},
{"unhex(c_int_d)", mysql.TypeVarString, charset.CharsetBin, mysql.BinaryFlag, 6, types.UnspecifiedLength},
{"unhex(c_char)", mysql.TypeVarString, charset.CharsetBin, mysql.BinaryFlag, 30, types.UnspecifiedLength},
{"unhex(c_char)", mysql.TypeVarString, charset.CharsetBin, mysql.BinaryFlag, 40, types.UnspecifiedLength},
{"ltrim(c_char)", mysql.TypeVarString, charset.CharsetUTF8MB4, 0, 20, types.UnspecifiedLength},
{"ltrim(c_binary)", mysql.TypeVarString, charset.CharsetBin, mysql.BinaryFlag, 20, types.UnspecifiedLength},
{"rtrim(c_char)", mysql.TypeVarString, charset.CharsetUTF8MB4, 0, 20, types.UnspecifiedLength},
Expand Down Expand Up @@ -301,22 +301,22 @@ func (s *testInferTypeSuite) createTestCase4StrFuncs() []typeInferTestCase {
{"rpad(c_char, c_int_d, c_binary)", mysql.TypeLongBlob, charset.CharsetBin, mysql.BinaryFlag, mysql.MaxBlobWidth, types.UnspecifiedLength},
{"rpad(c_char, c_int_d, c_char )", mysql.TypeLongBlob, charset.CharsetUTF8MB4, 0, mysql.MaxBlobWidth, types.UnspecifiedLength},

{"from_base64(c_int_d )", mysql.TypeLongBlob, charset.CharsetBin, mysql.BinaryFlag, mysql.MaxBlobWidth, types.UnspecifiedLength},
{"from_base64(c_bigint_d )", mysql.TypeLongBlob, charset.CharsetBin, mysql.BinaryFlag, mysql.MaxBlobWidth, types.UnspecifiedLength},
{"from_base64(c_float_d )", mysql.TypeLongBlob, charset.CharsetBin, mysql.BinaryFlag, mysql.MaxBlobWidth, types.UnspecifiedLength},
{"from_base64(c_double_d )", mysql.TypeLongBlob, charset.CharsetBin, mysql.BinaryFlag, mysql.MaxBlobWidth, types.UnspecifiedLength},
{"from_base64(c_decimal )", mysql.TypeLongBlob, charset.CharsetBin, mysql.BinaryFlag, mysql.MaxBlobWidth, types.UnspecifiedLength},
{"from_base64(c_datetime )", mysql.TypeLongBlob, charset.CharsetBin, mysql.BinaryFlag, mysql.MaxBlobWidth, types.UnspecifiedLength},
{"from_base64(c_time_d )", mysql.TypeLongBlob, charset.CharsetBin, mysql.BinaryFlag, mysql.MaxBlobWidth, types.UnspecifiedLength},
{"from_base64(c_timestamp_d)", mysql.TypeLongBlob, charset.CharsetBin, mysql.BinaryFlag, mysql.MaxBlobWidth, types.UnspecifiedLength},
{"from_base64(c_char )", mysql.TypeLongBlob, charset.CharsetBin, mysql.BinaryFlag, mysql.MaxBlobWidth, types.UnspecifiedLength},
{"from_base64(c_varchar )", mysql.TypeLongBlob, charset.CharsetBin, mysql.BinaryFlag, mysql.MaxBlobWidth, types.UnspecifiedLength},
{"from_base64(c_text_d )", mysql.TypeLongBlob, charset.CharsetBin, mysql.BinaryFlag, mysql.MaxBlobWidth, types.UnspecifiedLength},
{"from_base64(c_binary )", mysql.TypeLongBlob, charset.CharsetBin, mysql.BinaryFlag, mysql.MaxBlobWidth, types.UnspecifiedLength},
{"from_base64(c_varbinary )", mysql.TypeLongBlob, charset.CharsetBin, mysql.BinaryFlag, mysql.MaxBlobWidth, types.UnspecifiedLength},
{"from_base64(c_blob_d )", mysql.TypeLongBlob, charset.CharsetBin, mysql.BinaryFlag, mysql.MaxBlobWidth, types.UnspecifiedLength},
{"from_base64(c_set )", mysql.TypeLongBlob, charset.CharsetBin, mysql.BinaryFlag, mysql.MaxBlobWidth, types.UnspecifiedLength},
{"from_base64(c_enum )", mysql.TypeLongBlob, charset.CharsetBin, mysql.BinaryFlag, mysql.MaxBlobWidth, types.UnspecifiedLength},
{"from_base64(c_int_d )", mysql.TypeVarString, charset.CharsetBin, mysql.BinaryFlag, 60, types.UnspecifiedLength},
{"from_base64(c_bigint_d )", mysql.TypeVarString, charset.CharsetBin, mysql.BinaryFlag, 60, types.UnspecifiedLength},
{"from_base64(c_float_d )", mysql.TypeVarString, charset.CharsetBin, mysql.BinaryFlag, types.UnspecifiedLength, types.UnspecifiedLength},
{"from_base64(c_double_d )", mysql.TypeVarString, charset.CharsetBin, mysql.BinaryFlag, types.UnspecifiedLength, types.UnspecifiedLength},
{"from_base64(c_decimal )", mysql.TypeVarString, charset.CharsetBin, mysql.BinaryFlag, 24, types.UnspecifiedLength},
{"from_base64(c_datetime )", mysql.TypeVarString, charset.CharsetBin, mysql.BinaryFlag, 66, types.UnspecifiedLength},
{"from_base64(c_time_d )", mysql.TypeVarString, charset.CharsetBin, mysql.BinaryFlag, 30, types.UnspecifiedLength},
{"from_base64(c_timestamp_d)", mysql.TypeVarString, charset.CharsetBin, mysql.BinaryFlag, 57, types.UnspecifiedLength},
{"from_base64(c_char )", mysql.TypeVarString, charset.CharsetBin, mysql.BinaryFlag, 60, types.UnspecifiedLength},
{"from_base64(c_varchar )", mysql.TypeVarString, charset.CharsetBin, mysql.BinaryFlag, 60, types.UnspecifiedLength},
{"from_base64(c_text_d )", mysql.TypeMediumBlob, charset.CharsetBin, mysql.BinaryFlag, 196605, types.UnspecifiedLength},
{"from_base64(c_binary )", mysql.TypeVarString, charset.CharsetBin, mysql.BinaryFlag, 60, types.UnspecifiedLength},
{"from_base64(c_varbinary )", mysql.TypeVarString, charset.CharsetBin, mysql.BinaryFlag, 60, types.UnspecifiedLength},
{"from_base64(c_blob_d )", mysql.TypeMediumBlob, charset.CharsetBin, mysql.BinaryFlag, 196605, types.UnspecifiedLength},
{"from_base64(c_set )", mysql.TypeVarString, charset.CharsetBin, mysql.BinaryFlag, 15, types.UnspecifiedLength},
{"from_base64(c_enum )", mysql.TypeVarString, charset.CharsetBin, mysql.BinaryFlag, 3, types.UnspecifiedLength},

{"bin(c_int_d )", mysql.TypeVarString, charset.CharsetUTF8MB4, 0, 64, types.UnspecifiedLength},
{"bin(c_bigint_d )", mysql.TypeVarString, charset.CharsetUTF8MB4, 0, 64, types.UnspecifiedLength},
Expand Down Expand Up @@ -472,9 +472,9 @@ func (s *testInferTypeSuite) createTestCase4StrFuncs() []typeInferTestCase {
{"insert(c_binary, c_int_d, c_int_d, c_varchar)", mysql.TypeLongBlob, charset.CharsetBin, mysql.BinaryFlag, mysql.MaxBlobWidth, types.UnspecifiedLength},
{"insert(c_binary, c_int_d, c_int_d, c_binary)", mysql.TypeLongBlob, charset.CharsetBin, mysql.BinaryFlag, mysql.MaxBlobWidth, types.UnspecifiedLength},

{"export_set(c_double_d, c_text_d, c_text_d)", mysql.TypeLongBlob, charset.CharsetUTF8MB4, 0, mysql.MaxBlobWidth, types.UnspecifiedLength},
{"export_set(c_double_d, c_text_d, c_text_d, c_text_d)", mysql.TypeLongBlob, charset.CharsetUTF8MB4, 0, mysql.MaxBlobWidth, types.UnspecifiedLength},
{"export_set(c_double_d, c_text_d, c_text_d, c_text_d, c_int_d)", mysql.TypeLongBlob, charset.CharsetUTF8MB4, 0, mysql.MaxBlobWidth, types.UnspecifiedLength},
{"export_set(c_double_d, c_text_d, c_text_d)", mysql.TypeVarString, charset.CharsetUTF8MB4, 0, 508, types.UnspecifiedLength},
{"export_set(c_double_d, c_text_d, c_text_d, c_text_d)", mysql.TypeVarString, charset.CharsetUTF8MB4, 0, 508, types.UnspecifiedLength},
{"export_set(c_double_d, c_text_d, c_text_d, c_text_d, c_int_d)", mysql.TypeVarString, charset.CharsetUTF8MB4, 0, 508, types.UnspecifiedLength},

{"format(c_double_d, c_double_d)", mysql.TypeLongBlob, charset.CharsetUTF8MB4, 0, mysql.MaxBlobWidth, types.UnspecifiedLength},
{"format(c_double_d, c_double_d, c_binary)", mysql.TypeLongBlob, charset.CharsetUTF8MB4, 0, mysql.MaxBlobWidth, types.UnspecifiedLength},
Expand Down