executor: ignore overflow error when construct inner key (#10244) (#10306)

Author: alivxxx

executor/index_lookup_join.go

@@ -493,7 +493,11 @@ func (iw *innerWorker) constructDatumLookupKey(task *lookUpJoinTask, rowIdx int)
 		innerColType := iw.rowTypes[iw.keyCols[i]]
 		innerValue, err := outerValue.ConvertTo(sc, innerColType)
 		if err != nil {
-			return nil, errors.Trace(err)
+			// If the converted outerValue overflows, we don't need to lookup it.
+			if terror.ErrorEqual(err, types.ErrOverflow) {
+				return nil, nil
+			}
+			return nil, err
 		}
 		cmp, err := outerValue.CompareDatum(sc, &innerValue)
 		if err != nil {

executor/index_lookup_join_test.go

@@ -56,3 +56,12 @@ func (s *testSuite) TestInapplicableIndexJoinHint(c *C) {
 	tk.MustQuery(`select /*+ TIDB_INLJ(t2) */ * from t1 right join t2 on t1.a=t2.a;`).Check(testkit.Rows())
 	tk.MustQuery(`show warnings;`).Check(testkit.Rows(`Warning 1815 Optimizer Hint /*+ TIDB_INLJ(t2) */ is inapplicable`))
 }
+
+func (s *testSuite) TestIndexJoinOverflow(c *C) {
+	tk := testkit.NewTestKitWithInit(c, s.store)
+	tk.MustExec(`drop table if exists t1, t2`)
+	tk.MustExec(`create table t1(a int)`)
+	tk.MustExec(`insert into t1 values (-1)`)
+	tk.MustExec(`create table t2(a int unsigned, index idx(a));`)
+	tk.MustQuery(`select /*+ TIDB_INLJ(t2) */ * from t1 join t2 on t1.a = t2.a;`).Check(testkit.Rows())
+}