Fix pingcap#11211

SunRunAway · Jul 22, 2019 · b1ba5c5 · b1ba5c5
1 parent 7db2a1d
commit b1ba5c5
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diff --git a/expression/integration_test.go b/expression/integration_test.go
@@ -2765,6 +2765,7 @@ func (s *testIntegrationSuite) TestArithmeticBuiltin(c *C) {
 	tk.MustExec("INSERT IGNORE INTO t VALUE(12 MOD 0);")
 	tk.MustQuery("show warnings;").Check(testkit.Rows("Warning 1365 Division by 0"))
 	tk.MustQuery("select v from t;").Check(testkit.Rows("<nil>"))
+	tk.MustQuery("select 0.000 % 0.11234500000000000000;").Check(testkit.Rows("0.00000000000000000000"))
 
 	_, err = tk.Exec("INSERT INTO t VALUE(12 MOD 0);")
 	c.Assert(terror.ErrorEqual(err, expression.ErrDivisionByZero), IsTrue)

diff --git a/types/mydecimal.go b/types/mydecimal.go
@@ -1982,7 +1982,9 @@ func doDivMod(from1, from2, to, mod *MyDecimal, fracIncr int) error {
 	}
 	if prec1 <= 0 {
 		/* short-circuit everything: from1 == 0 */
+		resultFrac := to.resultFrac
 		*to = zeroMyDecimal
+		to.resultFrac = resultFrac
 		return nil
 	}
 	prec1 -= countLeadingZeroes((prec1-1)%digitsPerWord, from1.wordBuf[idx1])