types: fix the bug about the wrong query result for decimal type

executor/write_test.go

@@ -3901,6 +3901,19 @@ func (s *testSerialSuite) TestIssue20840(c *C) {
  tk.MustExec("drop table t1")
 }
 
+func (s *testSerialSuite) TestIssue22496(c *C) {
+ tk := testkit.NewTestKit(c, s.store)
+ tk.MustExec("use test")
+ tk.MustExec("drop table if exists t12")
+ tk.MustExec("create table t12(d decimal(15,2));")
+ _, err := tk.Exec("insert into t12 values('1,9999.00')")
+ c.Assert(err, NotNil)
+ tk.MustExec("set sql_mode=''")
+ tk.MustExec("insert into t12 values('1,999.00');")
+ tk.MustQuery("SELECT * FROM t12;").Check(testkit.Rows("1.00"))
+ tk.MustExec("drop table t12")
+}
+
 func (s *testSuite) TestEqualDatumsAsBinary(c *C) {
  tests := []struct {
  a []interface{}

types/convert_test.go

@@ -243,6 +243,15 @@ func (s *testTypeConvertSuite) TestConvertType(c *C) {
  v, err = Convert("-10000", ft)
  c.Assert(terror.ErrorEqual(err, ErrOverflow), IsTrue, Commentf("err %v", err))
  c.Assert(v.(*MyDecimal).String(), Equals, "-9999.9999")
+ v, err = Convert("1,999.00", ft)
+ c.Assert(terror.ErrorEqual(err, ErrBadNumber), IsTrue, Commentf("err %v", err))
+ c.Assert(v.(*MyDecimal).String(), Equals, "1.0000")
+ v, err = Convert("1,999,999.00", ft)
+ c.Assert(terror.ErrorEqual(err, ErrBadNumber), IsTrue, Commentf("err %v", err))
+ c.Assert(v.(*MyDecimal).String(), Equals, "1.0000")
+ v, err = Convert("199.00 ", ft)
+ c.Assert(err, IsNil)
+ c.Assert(v.(*MyDecimal).String(), Equals, "199.0000")
 
  // Test Datum.ToDecimal with bad number.
  d := NewDatum("hello")

types/mydecimal.go

@@ -389,6 +389,8 @@ func (d *MyDecimal) ToString() (str []byte) {
 
 // FromString parses decimal from string.
 func (d *MyDecimal) FromString(str []byte) error {
+ // strErr is used to check str is bad number or not
+ var strErr error
  for i := 0; i < len(str); i++ {
  if !isSpace(str[i]) {
  str = str[i:]
@@ -419,6 +421,8 @@ func (d *MyDecimal) FromString(str []byte) error {
  endIdx++
  }
  digitsFrac = endIdx - strIdx - 1
+ } else if strIdx < len(str) && (str[strIdx] != 'e' && str[strIdx] != 'E' && str[strIdx] != ' ') {
+ strErr = ErrBadNumber
  } else {
  digitsFrac = 0
  endIdx = strIdx
@@ -519,6 +523,9 @@ func (d *MyDecimal) FromString(str []byte) error {
  d.negative = false
  }
  d.resultFrac = d.digitsFrac
+ if strErr != nil {
+ return strErr
+ }
  return err
 }