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types: fix delete error when convert string to float or int #10861

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merged 5 commits into from
Jul 16, 2019
Merged

types: fix delete error when convert string to float or int #10861

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a2b9d21
fix delete empty string bug (#10861)
DQinYuan Jun 19, 2019
9964bd3
Merge branch 'master' into fix-delete-bug
DQinYuan Jul 2, 2019
8fc1c9f
Merge branch 'master' into fix-delete-bug
DQinYuan Jul 2, 2019
ffce1cc
Merge branch 'master' into fix-delete-bug
DQinYuan Jul 16, 2019
162365c
Merge branch 'master' into fix-delete-bug
zz-jason Jul 16, 2019
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1 change: 1 addition & 0 deletions executor/executor_test.go
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Original file line number Diff line number Diff line change
Expand Up @@ -451,6 +451,7 @@ func checkCases(tests []testCase, ld *executor.LoadDataInfo,
ctx.GetSessionVars().StmtCtx.DupKeyAsWarning = true
ctx.GetSessionVars().StmtCtx.BadNullAsWarning = true
ctx.GetSessionVars().StmtCtx.InLoadDataStmt = true
ctx.GetSessionVars().StmtCtx.InDeleteStmt = false
data, reachLimit, err1 := ld.InsertData(context.Background(), tt.data1, tt.data2)
c.Assert(err1, IsNil)
c.Assert(reachLimit, IsFalse)
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4 changes: 4 additions & 0 deletions types/convert.go
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Expand Up @@ -581,6 +581,10 @@ func ConvertJSONToDecimal(sc *stmtctx.StatementContext, j json.BinaryJSON) (*MyD

// getValidFloatPrefix gets prefix of string which can be successfully parsed as float.
func getValidFloatPrefix(sc *stmtctx.StatementContext, s string) (valid string, err error) {
if sc.InDeleteStmt && s == "" {
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This function is used in StrToUint, maybe not only delete statement?

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The condition statementContext.InDeleteStmt == true will keep it only work in delete statement.

And in delete statement, empty string can always convert to 0 without error and warning.(according to behaviour of mysql 5.x and 8.x ).

But in other statement like select, tidb is consistent with mysql(all with warning), so I restrict it in delete statement context.

return "0", nil
}

var (
sawDot bool
sawDigit bool
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23 changes: 23 additions & 0 deletions types/convert_test.go
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Expand Up @@ -461,6 +461,29 @@ func (s *testTypeConvertSuite) TestStrToNum(c *C) {
testStrToFloat(c, "1e649", math.MaxFloat64, false, nil)
testStrToFloat(c, "-1e649", -math.MaxFloat64, true, ErrTruncatedWrongVal)
testStrToFloat(c, "-1e649", -math.MaxFloat64, false, nil)

// for issue #10806
testDeleteEmptyStringError(c)
}

func testDeleteEmptyStringError(c *C) {
sc := new(stmtctx.StatementContext)
sc.InDeleteStmt = true

str := ""
expect := 0

val, err := StrToInt(sc, str)
c.Assert(err, IsNil)
c.Assert(val, Equals, int64(expect))

val1, err := StrToUint(sc, str)
c.Assert(err, IsNil)
c.Assert(val1, Equals, uint64(expect))

val2, err := StrToFloat(sc, str)
c.Assert(err, IsNil)
c.Assert(val2, Equals, float64(expect))
}

func (s *testTypeConvertSuite) TestFieldTypeToStr(c *C) {
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