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fix compatibility bug with convert string to int return wrong result #7483

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merged 8 commits into from
Aug 31, 2018
Merged

fix compatibility bug with convert string to int return wrong result #7483

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b9fbedc
fix compatibility bug with convert string to int return wrong result
CodeRushing Aug 24, 2018
dca12b6
Merge branch 'master' into my
ngaut Aug 24, 2018
4995e15
types: change AppendError to AppendWarning when convert to int overflows
CodeRushing Aug 27, 2018
41ef134
Merge branch 'master' into my
zz-jason Aug 27, 2018
da7a1a6
types:update comments in floatStrToIntStr when extraZeroCount exceed 20
CodeRushing Aug 28, 2018
42aaffb
Merge branch 'master' into my
zz-jason Aug 28, 2018
02d161d
Merge branch 'master' into my
Aug 31, 2018
1b5e5cc
Merge branch 'master' into my
Aug 31, 2018
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40 changes: 40 additions & 0 deletions expression/builtin_cast_test.go
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Original file line number Diff line number Diff line change
Expand Up @@ -127,6 +127,26 @@ func (s *testEvaluatorSuite) TestCast(c *C) {
lastWarn = warnings[len(warnings)-1]
c.Assert(terror.ErrorEqual(types.ErrTruncatedWrongVal, lastWarn.Err), IsTrue, Commentf("err %v", lastWarn.Err))

// cast('125e342.83' as unsigned)
f = BuildCastFunction(ctx, &Constant{Value: types.NewDatum("125e342.83"), RetType: types.NewFieldType(mysql.TypeString)}, tp1)
res, err = f.Eval(chunk.Row{})
c.Assert(err, IsNil)
c.Assert(res.GetUint64() == 125, IsTrue)

warnings = sc.GetWarnings()
lastWarn = warnings[len(warnings)-1]
c.Assert(terror.ErrorEqual(types.ErrOverflow, lastWarn.Err), IsTrue, Commentf("err %v", lastWarn.Err))

// cast('1e9223372036854775807' as unsigned)
f = BuildCastFunction(ctx, &Constant{Value: types.NewDatum("1e9223372036854775807"), RetType: types.NewFieldType(mysql.TypeString)}, tp1)
res, err = f.Eval(chunk.Row{})
c.Assert(err, IsNil)
c.Assert(res.GetUint64() == 1, IsTrue)

warnings = sc.GetWarnings()
lastWarn = warnings[len(warnings)-1]
c.Assert(terror.ErrorEqual(types.ErrOverflow, lastWarn.Err), IsTrue, Commentf("err %v", lastWarn.Err))

// cast('18446744073709551616' as signed);
mask := ^mysql.UnsignedFlag
tp1.Flag &= uint(mask)
Expand All @@ -149,6 +169,26 @@ func (s *testEvaluatorSuite) TestCast(c *C) {
lastWarn = warnings[len(warnings)-1]
c.Assert(terror.ErrorEqual(types.ErrCastAsSignedOverflow, lastWarn.Err), IsTrue, Commentf("err %v", lastWarn.Err))

// cast('125e342.83' as signed)
f = BuildCastFunction(ctx, &Constant{Value: types.NewDatum("125e342.83"), RetType: types.NewFieldType(mysql.TypeString)}, tp1)
res, err = f.Eval(chunk.Row{})
c.Assert(err, IsNil)
c.Assert(res.GetInt64() == 125, IsTrue)

warnings = sc.GetWarnings()
lastWarn = warnings[len(warnings)-1]
c.Assert(terror.ErrorEqual(types.ErrOverflow, lastWarn.Err), IsTrue, Commentf("err %v", lastWarn.Err))

// cast('1e9223372036854775807' as signed)
f = BuildCastFunction(ctx, &Constant{Value: types.NewDatum("1e9223372036854775807"), RetType: types.NewFieldType(mysql.TypeString)}, tp1)
res, err = f.Eval(chunk.Row{})
c.Assert(err, IsNil)
c.Assert(res.GetInt64() == 1, IsTrue)

warnings = sc.GetWarnings()
lastWarn = warnings[len(warnings)-1]
c.Assert(terror.ErrorEqual(types.ErrOverflow, lastWarn.Err), IsTrue, Commentf("err %v", lastWarn.Err))

// create table t1(s1 time);
// insert into t1 values('11:11:11');
// select cast(s1 as decimal(7, 2)) from t1;
Expand Down
10 changes: 6 additions & 4 deletions types/convert.go
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Expand Up @@ -236,13 +236,13 @@ func getValidIntPrefix(sc *stmtctx.StatementContext, str string) (string, error)
if err != nil {
return floatPrefix, errors.Trace(err)
}
return floatStrToIntStr(floatPrefix)
return floatStrToIntStr(sc, floatPrefix, str)
}

// floatStrToIntStr converts a valid float string into valid integer string which can be parsed by
// strconv.ParseInt, we can't parse float first then convert it to string because precision will
// be lost.
func floatStrToIntStr(validFloat string) (string, error) {
func floatStrToIntStr(sc *stmtctx.StatementContext, validFloat string, oriStr string) (string, error) {
var dotIdx = -1
var eIdx = -1
for i := 0; i < len(validFloat); i++ {
Expand Down Expand Up @@ -275,7 +275,8 @@ func floatStrToIntStr(validFloat string) (string, error) {
}
if exp > 0 && int64(intCnt) > (math.MaxInt64-int64(exp)) {
// (exp + incCnt) overflows MaxInt64.
return validFloat, ErrOverflow.GenByArgs("BIGINT", validFloat)
sc.AppendWarning(ErrOverflow.GenByArgs("BIGINT", oriStr))
return validFloat[:eIdx], nil
}
intCnt += exp
if intCnt <= 0 {
Expand All @@ -292,7 +293,8 @@ func floatStrToIntStr(validFloat string) (string, error) {
extraZeroCount := intCnt - len(digits)
if extraZeroCount > 20 {
// Return overflow to avoid allocating too much memory.
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Should we update this comment?

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@CodeRushing Please update this comment.

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@zz-jason already updated

return validFloat, ErrOverflow.GenByArgs("BIGINT", validFloat)
sc.AppendWarning(ErrOverflow.GenByArgs("BIGINT", oriStr))
return validFloat[:eIdx], nil
}
validInt = string(digits) + strings.Repeat("0", extraZeroCount)
}
Expand Down
13 changes: 9 additions & 4 deletions types/convert_test.go
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Expand Up @@ -684,10 +684,15 @@ func (s *testTypeConvertSuite) TestGetValidFloat(c *C) {
_, err := strconv.ParseFloat(prefix, 64)
c.Assert(err, IsNil)
}
_, err := floatStrToIntStr("1e9223372036854775807")
c.Assert(terror.ErrorEqual(err, ErrOverflow), IsTrue, Commentf("err %v", err))
_, err = floatStrToIntStr("1e21")
c.Assert(terror.ErrorEqual(err, ErrOverflow), IsTrue, Commentf("err %v", err))
floatStr, err := floatStrToIntStr(sc, "1e9223372036854775807", "1e9223372036854775807")
c.Assert(err, IsNil)
c.Assert(floatStr, Equals, "1")
floatStr, err = floatStrToIntStr(sc, "125e342", "125e342.83")
c.Assert(err, IsNil)
c.Assert(floatStr, Equals, "125")
floatStr, err = floatStrToIntStr(sc, "1e21", "1e21")
c.Assert(err, IsNil)
c.Assert(floatStr, Equals, "1")
}

// TestConvertTime tests time related conversion.
Expand Down