executor: special handling is required when an "auto id out of range" error occurs in insert ignore into ... on on duplicate ...

executor/insert_common.go

@@ -32,6 +32,7 @@ import (
 	"github.com/pingcap/tidb/parser/ast"
 	"github.com/pingcap/tidb/parser/model"
 	"github.com/pingcap/tidb/parser/mysql"
+	"github.com/pingcap/tidb/planner/core"
 	"github.com/pingcap/tidb/sessionctx"
 	"github.com/pingcap/tidb/sessionctx/variable"
 	"github.com/pingcap/tidb/sessiontxn"
@@ -773,6 +774,11 @@ func setDatumAutoIDAndCast(ctx sessionctx.Context, d *types.Datum, id int64, col
 	if err == nil && d.GetInt64() < id {
 		// Auto ID is out of range, the truncated ID is possible to duplicate with an existing ID.
 		// To prevent updating unrelated rows in the REPLACE statement, it is better to throw an error.
+		sc := ctx.GetSessionVars().StmtCtx
+		insertPlan, ok := sc.GetPlan().(*core.Insert)
+		if ok && sc.TruncateAsWarning && len(insertPlan.OnDuplicate) > 0 {
+			return err
+		}
 		return autoid.ErrAutoincReadFailed
 	}
 	return err

executor/writetest/write_test.go

@@ -592,6 +592,35 @@ commit;`
 	tk.MustQuery("show warnings").Check(testkit.Rows("Warning 1526 Table has no partition for value 3"))
 }
 
+func TestIssue38950(t *testing.T) {
+	store := testkit.CreateMockStore(t)
+	var cfg kv.InjectionConfig
+	tk := testkit.NewTestKit(t, kv.NewInjectedStore(store, &cfg))
+	tk.MustExec("use test")
+	testSQL := `drop table if exists t;
+    create table t (id smallint auto_increment primary key);`
+	tk.MustExec(testSQL)
+
+	testSQL = `alter table t add column c1 int default 1;`
+	tk.MustExec(testSQL)
+
+	testSQL = `insert ignore into t(id) values (194626268);`
+	tk.MustExec(testSQL)
+	require.Empty(t, tk.Session().LastMessage())
+
+	r := tk.MustQuery("select * from t;")
+	rowStr := fmt.Sprintf("%v %v", "32767", "1")
+	r.Check(testkit.Rows(rowStr))
+
+	tk.MustExec("insert ignore into t(id) values ('*') on duplicate key update c1 = 2;")
+	require.Equal(t, int64(2), int64(tk.Session().AffectedRows()))
+	require.Empty(t, tk.Session().LastMessage())
+
+	r = tk.MustQuery("select * from t;")
+	rowStr = fmt.Sprintf("%v %v", "32767", "2")
+	r.Check(testkit.Rows(rowStr))
+}
+
 func TestInsertOnDup(t *testing.T) {
 	store := testkit.CreateMockStore(t)
 	var cfg kv.InjectionConfig