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expression: open CAST string as real push down switcher #14323

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merged 7 commits into from Jan 6, 2020
Merged

expression: open CAST string as real push down switcher #14323

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e32b735
expression: open CAST string as real push down switcher
lonng Jan 2, 2020
0b6a43c
fix ci
lonng Jan 2, 2020
044bc2c
fix ci
lonng Jan 2, 2020
bc486e1
fix arithmetic plus
lonng Jan 3, 2020
e9c525b
fix ci
lonng Jan 3, 2020
4e0ef2b
Merge remote-tracking branch 'origin/master' into open-cast-string-real
lonng Jan 3, 2020
b02644f
Merge branch 'master' into open-cast-string-real
lonng Jan 6, 2020
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6 changes: 3 additions & 3 deletions cmd/explaintest/r/explain_easy.result
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Expand Up @@ -465,9 +465,9 @@ begin;
insert tb values ('1');
explain select * from ta where a = 1;
id count task operator info
Selection_5 8000.00 root eq(cast(test.ta.a), 1)
└─TableReader_7 10000.00 root data:TableScan_6
└─TableScan_6 10000.00 cop[tikv] table:ta, range:[-inf,+inf], keep order:false, stats:pseudo
TableReader_7 8000.00 root data:Selection_6
└─Selection_6 8000.00 cop[tikv] eq(cast(test.ta.a), 1)
└─TableScan_5 10000.00 cop[tikv] table:ta, range:[-inf,+inf], keep order:false, stats:pseudo
rollback;
drop table if exists t1, t2;
create table t1(a int, b int, c int, primary key(a, b));
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15 changes: 9 additions & 6 deletions expression/builtin_arithmetic.go
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Expand Up @@ -273,13 +273,16 @@ func (s *builtinArithmeticPlusRealSig) Clone() builtinFunc {
}

func (s *builtinArithmeticPlusRealSig) evalReal(row chunk.Row) (float64, bool, error) {
a, isNull, err := s.args[0].EvalReal(s.ctx, row)
if isNull || err != nil {
return 0, isNull, err
a, isLHSNull, err := s.args[0].EvalReal(s.ctx, row)
if err != nil {
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Why change this?

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All of the expressions which have two arguments in TiDB have this pattern, they have inconsistent behavior with MySQL.

create table t (a varchar(10));
insert into t values ('2007');
select * from t where NULL + pow(7020, a);

The above statement should report an error.

return 0, isLHSNull, err
}
b, isNull, err := s.args[1].EvalReal(s.ctx, row)
if isNull || err != nil {
return 0, isNull, err
b, isRHSNull, err := s.args[1].EvalReal(s.ctx, row)
if err != nil {
return 0, isRHSNull, err
}
if isLHSNull || isRHSNull {
return 0, true, nil
}
if (a > 0 && b > math.MaxFloat64-a) || (a < 0 && b < -math.MaxFloat64-a) {
return 0, true, types.ErrOverflow.GenWithStackByArgs("DOUBLE", fmt.Sprintf("(%s + %s)", s.args[0].String(), s.args[1].String()))
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1 change: 0 additions & 1 deletion expression/expr_to_pb.go
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Expand Up @@ -468,7 +468,6 @@ func (pc PbConverter) canFuncBePushed(sf *ScalarFunction) bool {
case ast.Cast:
switch sf.Function.PbCode() {
case tipb.ScalarFuncSig_CastStringAsInt,
tipb.ScalarFuncSig_CastStringAsReal,
tipb.ScalarFuncSig_CastStringAsTime,
tipb.ScalarFuncSig_CastTimeAsInt:
return false
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2 changes: 1 addition & 1 deletion go.mod
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Expand Up @@ -54,7 +54,7 @@ require (
github.com/spaolacci/murmur3 v0.0.0-20180118202830-f09979ecbc72
github.com/struCoder/pidusage v0.1.2
github.com/tiancaiamao/appdash v0.0.0-20181126055449-889f96f722a2
github.com/uber-go/atomic v1.3.2 // indirect
github.com/uber-go/atomic v1.3.2
github.com/uber/jaeger-client-go v2.15.0+incompatible
github.com/uber/jaeger-lib v1.5.0 // indirect
github.com/unrolled/render v0.0.0-20180914162206-b9786414de4d // indirect
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2 changes: 1 addition & 1 deletion planner/core/testdata/plan_suite_out.json
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Expand Up @@ -1045,7 +1045,7 @@
},
{
"SQL": "select a from t where c = 'hanfei'",
"Best": "IndexReader(Index(t.c_d_e)[[NULL,+inf]])->Sel([eq(cast(test.t.c), cast(hanfei))])->Projection"
"Best": "IndexReader(Index(t.c_d_e)[[NULL,+inf]]->Sel([eq(cast(test.t.c), cast(hanfei))]))->Projection"
}
]
},
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