executor: HashJoinExec checks the buildError even if the probeSide is…

… empty

executor/executor_test.go

@@ -9487,3 +9487,17 @@ func (s *testSerialSuite) TestIssue28650(c *C) {
 		}()
 	}
 }
+
+func (s *testSerialSuite) TestIssue30289(c *C) {
+	tk := testkit.NewTestKit(c, s.store)
+	tk.MustExec("use test")
+	fpName := "github.com/pingcap/tidb/executor/issue30289"
+	c.Assert(failpoint.Enable(fpName, `return(true)`), IsNil)
+	defer func() {
+		c.Assert(failpoint.Disable(fpName), IsNil)
+	}()
+	tk.MustExec("drop table if exists t")
+	tk.MustExec("create table t(a int)")
+	err := tk.QueryToErr("select /*+ hash_join(t1) */ * from t t1 join t t2 on t1.a=t2.a")
+	c.Assert(err.Error(), Matches, "issue30289 build return error")
+}

executor/join.go

@@ -214,9 +214,13 @@ func (e *HashJoinExec) fetchProbeSideChunks(ctx context.Context) {
 			return
 		}
 		if !hasWaitedForBuild {
+			failpoint.Inject("issue30289", func(val failpoint.Value) {
+				if val.(bool) {
+					probeSideResult.Reset()
+				}
+			})
 			if probeSideResult.NumRows() == 0 && !e.useOuterToBuild {
 				e.finished.Store(true)
-				return
 			}
 			emptyBuild, buildErr := e.wait4BuildSide()
 			if buildErr != nil {
@@ -264,6 +268,11 @@ func (e *HashJoinExec) fetchBuildSideRows(ctx context.Context, chkCh chan<- *chu
 		}
 		chk := chunk.NewChunkWithCapacity(e.buildSideExec.base().retFieldTypes, e.ctx.GetSessionVars().MaxChunkSize)
 		err = Next(ctx, e.buildSideExec, chk)
+		failpoint.Inject("issue30289", func(val failpoint.Value) {
+			if val.(bool) {
+				err = errors.Errorf("issue30289 build return error")
+			}
+		})
 		if err != nil {
 			e.buildFinished <- errors.Trace(err)
 			return