expression: fix issue that period_diff is not compatible with MySQL 8.0 (#10383) (#10501)

Author: sourcelliu

expression/builtin_time.go

@@ -4994,6 +4994,14 @@ func (b *builtinPeriodDiffSig) evalInt(row chunk.Row) (int64, bool, error) {
 		return 0, isNull, errors.Trace(err)
 	}
 
+	if !validPeriod(p1) {
+		return 0, false, errIncorrectArgs.GenWithStackByArgs("period_diff")
+	}
+
+	if !validPeriod(p2) {
+		return 0, false, errIncorrectArgs.GenWithStackByArgs("period_diff")
+	}
+
 	return int64(period2Month(uint64(p1)) - period2Month(uint64(p2))), false, nil
 }
 

expression/builtin_time_test.go

@@ -2351,19 +2351,24 @@ func (s *testEvaluatorSuite) TestPeriodDiff(c *C) {
 	}{
 		{201611, 201611, true, 0},
 		{200802, 200703, true, 11},
-		{0, 999999999, true, -120000086},
-		{9999999, 0, true, 1200086},
-		{411, 200413, true, -2},
-		{197000, 207700, true, -1284},
 		{201701, 201611, true, 2},
 		{201702, 201611, true, 3},
 		{201510, 201611, true, -13},
 		{201702, 1611, true, 3},
 		{197102, 7011, true, 3},
-		{12509, 12323, true, 10},
-		{12509, 12323, true, 10},
 	}
 
+	tests2 := []struct {
+		Period1 int64
+		Period2 int64
+	}{
+		{0, 999999999},
+		{9999999, 0},
+		{411, 200413},
+		{197000, 207700},
+		{12509, 12323},
+		{12509, 12323},
+	}
 	fc := funcs[ast.PeriodDiff]
 	for _, test := range tests {
 		period1 := types.NewIntDatum(test.Period1)
@@ -2381,6 +2386,18 @@ func (s *testEvaluatorSuite) TestPeriodDiff(c *C) {
 		value := result.GetInt64()
 		c.Assert(value, Equals, test.Expect)
 	}
+
+	for _, test := range tests2 {
+		period1 := types.NewIntDatum(test.Period1)
+		period2 := types.NewIntDatum(test.Period2)
+		f, err := fc.getFunction(s.ctx, s.datumsToConstants([]types.Datum{period1, period2}))
+		c.Assert(err, IsNil)
+		c.Assert(f, NotNil)
+		_, err = evalBuiltinFunc(f, chunk.Row{})
+		c.Assert(err, NotNil)
+		c.Assert(err.Error(), Equals, "[expression:1210]Incorrect arguments to period_diff")
+	}
+
 	// nil
 	args := []types.Datum{types.NewDatum(nil), types.NewIntDatum(0)}
 	f, err := fc.getFunction(s.ctx, s.datumsToConstants(args))

expression/integration_test.go

@@ -1462,10 +1462,16 @@ func (s *testIntegrationSuite) TestTimeBuiltin(c *C) {
 	}
 
 	// for period_diff
-	result = tk.MustQuery(`SELECT period_diff(191, 2), period_diff(191, -2), period_diff(0, 0), period_diff(191, 191);`)
-	result.Check(testkit.Rows("101 -2213609288845122103 0 0"))
-	result = tk.MustQuery(`SELECT period_diff(NULL, 2), period_diff(-191, NULL), period_diff(NULL, NULL), period_diff(12.09, 2), period_diff("21aa", "11aa"), period_diff("", "");`)
-	result.Check(testkit.Rows("<nil> <nil> <nil> 10 10 0"))
+	result = tk.MustQuery(`SELECT period_diff(200807, 200705), period_diff(200807, 200908);`)
+	result.Check(testkit.Rows("14 -13"))
+	result = tk.MustQuery(`SELECT period_diff(NULL, 2), period_diff(-191, NULL), period_diff(NULL, NULL), period_diff(12.09, 2), period_diff("12aa", "11aa");`)
+	result.Check(testkit.Rows("<nil> <nil> <nil> 10 1"))
+	for _, errPeriod := range []string{
+		"period_diff(-00013,1)", "period_diff(00013,1)", "period_diff(0, 0)", "period_diff(200013, 1)", "period_diff(5612, 4513)", "period_diff('', '')",
+	} {
+		err := tk.QueryToErr(fmt.Sprintf("SELECT %v;", errPeriod))
+		c.Assert(err.Error(), Equals, "[expression:1210]Incorrect arguments to period_diff")
+	}
 
 	// TODO: fix `CAST(xx as duration)` and release the test below:
 	// result = tk.MustQuery(`SELECT hour("aaa"), hour(123456), hour(1234567);`)