Skip to content
New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

expression: fix cast json to decimal bug. #8030

Merged
merged 7 commits into from
Oct 29, 2018
Merged
Show file tree
Hide file tree
Changes from 5 commits
Commits
File filter

Filter by extension

Filter by extension

Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
15 changes: 15 additions & 0 deletions executor/executor_test.go
Original file line number Diff line number Diff line change
Expand Up @@ -1369,6 +1369,21 @@ func (s *testSuite) TestJSON(c *C) {
// check CAST AS JSON.
result = tk.MustQuery(`select CAST('3' AS JSON), CAST('{}' AS JSON), CAST(null AS JSON)`)
result.Check(testkit.Rows(`3 {} <nil>`))

// Check cast json to decimal.
tk.MustExec("drop table if exists test_json")
tk.MustExec("create table test_json ( a decimal(60,2) as (JSON_EXTRACT(b,'$.c')), b json );")
tk.MustExec(`insert into test_json (b) values
('{"c": "1267.1"}'),
('{"c": "1267.01"}'),
('{"c": "1267.1234"}'),
('{"c": "1267.3456"}'),
('{"c": "1234567890123456789012345678901234567890123456789012345"}'),
('{"c": "1234567890123456789012345678901234567890123456789012345.12345"}');`)

tk.MustQuery("select a from test_json;").Check(testkit.Rows("1267.10", "1267.01", "1267.12",
"1267.35", "1234567890123456789012345678901234567890123456789012345.00",
"1234567890123456789012345678901234567890123456789012345.12"))
}

func (s *testSuite) TestMultiUpdate(c *C) {
Expand Down
8 changes: 4 additions & 4 deletions expression/builtin_cast.go
Original file line number Diff line number Diff line change
Expand Up @@ -1541,11 +1541,11 @@ func (b *builtinCastJSONAsDecimalSig) evalDecimal(row chunk.Row) (res *types.MyD
return res, isNull, errors.Trace(err)
}
sc := b.ctx.GetSessionVars().StmtCtx
f64, err := types.ConvertJSONToFloat(sc, val)
if err == nil {
res = new(types.MyDecimal)
err = res.FromFloat64(f64)
res, err = types.ConvertJSONToDecimal(sc, val)
if err != nil {
return res, false, errors.Trace(err)
}
res, err = types.ProduceDecWithSpecifiedTp(res, b.tp, sc)
return res, false, errors.Trace(err)
}

Expand Down
42 changes: 42 additions & 0 deletions expression/builtin_cast_test.go
Original file line number Diff line number Diff line change
Expand Up @@ -1082,6 +1082,48 @@ func (s *testEvaluatorSuite) TestCastFuncSig(c *C) {
c.Assert(iRes, Equals, int64(0))
}

func (s *testEvaluatorSuite) TestCastJSONAsDecimalSig(c *C) {
ctx, sc := s.ctx, s.ctx.GetSessionVars().StmtCtx
originIgnoreTruncate := sc.IgnoreTruncate
sc.IgnoreTruncate = true
defer func() {
sc.IgnoreTruncate = originIgnoreTruncate
}()

col := &Column{RetType: types.NewFieldType(mysql.TypeJSON), Index: 0}
decFunc := newBaseBuiltinCastFunc(newBaseBuiltinFunc(ctx, []Expression{col}), false)
decFunc.tp = types.NewFieldType(mysql.TypeNewDecimal)
decFunc.tp.Flen = 60
decFunc.tp.Decimal = 2
sig := &builtinCastJSONAsDecimalSig{decFunc}

var tests = []struct {
In string
Out *types.MyDecimal
}{
{`{}`, types.NewDecFromStringForTest("0")},
{`[]`, types.NewDecFromStringForTest("0")},
{`3`, types.NewDecFromStringForTest("3")},
{`-3`, types.NewDecFromStringForTest("-3")},
{`4.5`, types.NewDecFromStringForTest("4.5")},
{`"1234"`, types.NewDecFromStringForTest("1234")},
// test truncate
{`"1234.1234"`, types.NewDecFromStringForTest("1234.12")},
{`"1234.4567"`, types.NewDecFromStringForTest("1234.46")},
// test big decimal
{`"1234567890123456789012345678901234567890123456789012345"`, types.NewDecFromStringForTest("1234567890123456789012345678901234567890123456789012345")},
}
for _, tt := range tests {
j, err := json.ParseBinaryFromString(tt.In)
c.Assert(err, IsNil)
row := chunk.MutRowFromDatums([]types.Datum{types.NewDatum(j)})
res, isNull, err := sig.evalDecimal(row.ToRow())
c.Assert(isNull, Equals, false)
c.Assert(err, IsNil)
c.Assert(res.Compare(tt.Out), Equals, 0)
}
}

// TestWrapWithCastAsTypesClasses tests WrapWithCastAsInt/Real/String/Decimal.
func (s *testEvaluatorSuite) TestWrapWithCastAsTypesClasses(c *C) {
ctx := s.ctx
Expand Down
15 changes: 15 additions & 0 deletions types/convert.go
Original file line number Diff line number Diff line change
Expand Up @@ -378,6 +378,21 @@ func ConvertJSONToFloat(sc *stmtctx.StatementContext, j json.BinaryJSON) (float6
return 0, errors.New("Unknown type code in JSON")
}

// ConvertJSONToDecimal casts JSON into decimal.
func ConvertJSONToDecimal(sc *stmtctx.StatementContext, j json.BinaryJSON) (*MyDecimal, error) {
res := new(MyDecimal)
if j.TypeCode != json.TypeCodeString {
f64, err := ConvertJSONToFloat(sc, j)
if err != nil {
return res, errors.Trace(err)
}
err = res.FromFloat64(f64)
return res, errors.Trace(err)
Copy link
Member

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

What about create two new function NewDecFromFloat and NewDecFromString and call it here?

Copy link
Contributor Author

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

MyDecimal already have FromFloat64 and FromString methods. What is the difference between NewDecFromFloat and FromFloat64?

}
err := sc.HandleTruncate(res.FromString([]byte(j.GetString())))
return res, errors.Trace(err)
}

// getValidFloatPrefix gets prefix of string which can be successfully parsed as float.
func getValidFloatPrefix(sc *stmtctx.StatementContext, s string) (valid string, err error) {
var (
Expand Down
21 changes: 21 additions & 0 deletions types/convert_test.go
Original file line number Diff line number Diff line change
Expand Up @@ -804,6 +804,27 @@ func (s *testTypeConvertSuite) TestConvertJSONToFloat(c *C) {
}
}

func (s *testTypeConvertSuite) TestConvertJSONToDecimal(c *C) {
var tests = []struct {
In string
Out *MyDecimal
}{
{`{}`, NewDecFromStringForTest("0")},
{`[]`, NewDecFromStringForTest("0")},
{`3`, NewDecFromStringForTest("3")},
{`-3`, NewDecFromStringForTest("-3")},
{`4.5`, NewDecFromStringForTest("4.5")},
{`"1234"`, NewDecFromStringForTest("1234")},
{`"1234567890123456789012345678901234567890123456789012345"`, NewDecFromStringForTest("1234567890123456789012345678901234567890123456789012345")},
}
for _, tt := range tests {
j, err := json.ParseBinaryFromString(tt.In)
c.Assert(err, IsNil)
casted, _ := ConvertJSONToDecimal(new(stmtctx.StatementContext), j)
c.Assert(casted.Compare(tt.Out), Equals, 0)
}
}

func (s *testTypeConvertSuite) TestNumberToDuration(c *C) {
var testCases = []struct {
number int64
Expand Down