fix

pingcap · Jan 9, 2023 · feef2a8 · feef2a8
1 parent 199bb38
commit feef2a8
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Showing 2 changed files with 11 additions and 1 deletion.
diff --git a/planner/core/integration_test.go b/planner/core/integration_test.go
@@ -8219,3 +8219,11 @@ func TestAutoIncrementCheckWithCheckConstraint(t *testing.T) {
 		KEY idx_autoinc_id (id)
 	)`)
 }
+
+func TestIssue40285(t *testing.T) {
+	store := testkit.CreateMockStore(t)
+	tk := testkit.NewTestKit(t, store)
+	tk.MustExec("use test")
+	tk.MustExec("CREATE TABLE t(col1 enum('p5', '9a33x') NOT NULL DEFAULT 'p5',col2 tinyblob DEFAULT NULL) ENGINE = InnoDB DEFAULT CHARSET = latin1 COLLATE = latin1_bin;")
+	tk.MustQuery("(select last_value(col1) over () as r0 from t) union all (select col2 as r0 from t);")
+}
diff --git a/planner/core/logical_plan_builder.go b/planner/core/logical_plan_builder.go
@@ -1576,7 +1576,9 @@ func (*PlanBuilder) setUnionFlen(resultTp *types.FieldType, cols []expression.Ex
 		childTp := cols[i].GetType()
 		childTpCharLen := 1
 		if isBinary {
-			childTpCharLen = charset.CharacterSetInfos[childTp.GetCharset()].Maxlen
+			if charsetInfo, ok := charset.CharacterSetInfos[childTp.GetCharset()]; ok {
+				childTpCharLen = charsetInfo.Maxlen
+			}
 		}
 		resultTp.SetFlen(mathutil.Max(resultTp.GetFlen(), childTpCharLen*childTp.GetFlen()))
 	}