importinto/lightning: fix negative value cast to upper bound in non strict sql mode

pkg/lightning/backend/kv/BUILD.bazel

@@ -35,6 +35,7 @@ go_library(
         "//pkg/table/tblctx",
         "//pkg/tablecodec",
         "//pkg/types",
+        "//pkg/util",
         "//pkg/util/chunk",
         "//pkg/util/codec",
         "//pkg/util/context",

pkg/lightning/backend/kv/context.go

@@ -31,6 +31,7 @@ import (
 	"github.com/pingcap/tidb/pkg/table"
 	"github.com/pingcap/tidb/pkg/table/tblctx"
 	"github.com/pingcap/tidb/pkg/types"
+	"github.com/pingcap/tidb/pkg/util"
 	contextutil "github.com/pingcap/tidb/pkg/util/context"
 	"github.com/pingcap/tidb/pkg/util/intest"
 	"github.com/pingcap/tidb/pkg/util/timeutil"
@@ -48,11 +49,7 @@ type litExprContext struct {
 
 // NewExpressionContext creates a new `*ExprContext` for lightning import.
 func newLitExprContext(sqlMode mysql.SQLMode, sysVars map[string]string, timestamp int64) (*litExprContext, error) {
-	flags := types.DefaultStmtFlags.
-		WithTruncateAsWarning(!sqlMode.HasStrictMode()).
-		WithIgnoreInvalidDateErr(sqlMode.HasAllowInvalidDatesMode()).
-		WithIgnoreZeroInDate(!sqlMode.HasStrictMode() || sqlMode.HasAllowInvalidDatesMode() ||
-			!sqlMode.HasNoZeroInDateMode() || !sqlMode.HasNoZeroDateMode())
+	flags := util.GetTypeFlagsForImportInto(types.DefaultStmtFlags, sqlMode)
 
 	errLevels := stmtctx.DefaultStmtErrLevels
 	errLevels[errctx.ErrGroupTruncate] = errctx.ResolveErrLevel(flags.IgnoreTruncateErr(), flags.TruncateAsWarning())

pkg/lightning/backend/kv/context_test.go

@@ -36,6 +36,7 @@ import (
 )
 
 func TestLitExprContext(t *testing.T) {
+	baseFlags := types.DefaultStmtFlags &^ types.FlagAllowNegativeToUnsigned
 	cases := []struct {
 		sqlMode       mysql.SQLMode
 		sysVars       map[string]string
@@ -47,7 +48,7 @@ func TestLitExprContext(t *testing.T) {
 		{
 			sqlMode:    mysql.ModeNone,
 			timestamp:  1234567,
-			checkFlags: types.DefaultStmtFlags | types.FlagTruncateAsWarning | types.FlagIgnoreZeroInDateErr,
+			checkFlags: baseFlags | types.FlagTruncateAsWarning | types.FlagIgnoreZeroInDateErr,
 			checkErrLevel: func() errctx.LevelMap {
 				m := stmtctx.DefaultStmtErrLevels
 				m[errctx.ErrGroupTruncate] = errctx.LevelWarn
@@ -68,7 +69,7 @@ func TestLitExprContext(t *testing.T) {
 		{
 			sqlMode: mysql.ModeStrictTransTables | mysql.ModeNoZeroDate | mysql.ModeNoZeroInDate |
 				mysql.ModeErrorForDivisionByZero,
-			checkFlags: types.DefaultStmtFlags,
+			checkFlags: baseFlags,
 			checkErrLevel: func() errctx.LevelMap {
 				m := stmtctx.DefaultStmtErrLevels
 				m[errctx.ErrGroupTruncate] = errctx.LevelError
@@ -80,7 +81,7 @@ func TestLitExprContext(t *testing.T) {
 		},
 		{
 			sqlMode:    mysql.ModeNoZeroDate | mysql.ModeNoZeroInDate | mysql.ModeErrorForDivisionByZero,
-			checkFlags: types.DefaultStmtFlags | types.FlagTruncateAsWarning | types.FlagIgnoreZeroInDateErr,
+			checkFlags: baseFlags | types.FlagTruncateAsWarning | types.FlagIgnoreZeroInDateErr,
 			checkErrLevel: func() errctx.LevelMap {
 				m := stmtctx.DefaultStmtErrLevels
 				m[errctx.ErrGroupTruncate] = errctx.LevelWarn
@@ -92,7 +93,7 @@ func TestLitExprContext(t *testing.T) {
 		},
 		{
 			sqlMode:    mysql.ModeStrictTransTables | mysql.ModeNoZeroInDate,
-			checkFlags: types.DefaultStmtFlags | types.FlagIgnoreZeroInDateErr,
+			checkFlags: baseFlags | types.FlagIgnoreZeroInDateErr,
 			checkErrLevel: func() errctx.LevelMap {
 				m := stmtctx.DefaultStmtErrLevels
 				m[errctx.ErrGroupTruncate] = errctx.LevelError
@@ -104,7 +105,7 @@ func TestLitExprContext(t *testing.T) {
 		},
 		{
 			sqlMode:    mysql.ModeStrictTransTables | mysql.ModeNoZeroDate,
-			checkFlags: types.DefaultStmtFlags | types.FlagIgnoreZeroInDateErr,
+			checkFlags: baseFlags | types.FlagIgnoreZeroInDateErr,
 			checkErrLevel: func() errctx.LevelMap {
 				m := stmtctx.DefaultStmtErrLevels
 				m[errctx.ErrGroupTruncate] = errctx.LevelError
@@ -116,7 +117,7 @@ func TestLitExprContext(t *testing.T) {
 		},
 		{
 			sqlMode:    mysql.ModeStrictTransTables | mysql.ModeAllowInvalidDates,
-			checkFlags: types.DefaultStmtFlags | types.FlagIgnoreZeroInDateErr | types.FlagIgnoreInvalidDateErr,
+			checkFlags: baseFlags | types.FlagIgnoreZeroInDateErr | types.FlagIgnoreInvalidDateErr,
 			checkErrLevel: func() errctx.LevelMap {
 				m := stmtctx.DefaultStmtErrLevels
 				m[errctx.ErrGroupTruncate] = errctx.LevelError

pkg/util/misc.go

@@ -698,12 +698,14 @@ func createTLSCertificates(certpath string, keypath string, rsaKeySize int) erro
 // GetTypeFlagsForInsert gets the type flags for insert statement.
 func GetTypeFlagsForInsert(baseFlags types.Flags, sqlMode mysql.SQLMode, ignoreErr bool) types.Flags {
 	strictSQLMode := sqlMode.HasStrictMode()
+	// see comments in ResetContextOfStmt for WithAllowNegativeToUnsigned part.
 	return baseFlags.
 		WithTruncateAsWarning(!strictSQLMode || ignoreErr).
 		WithIgnoreInvalidDateErr(sqlMode.HasAllowInvalidDatesMode()).
 		WithIgnoreZeroInDate(!sqlMode.HasNoZeroInDateMode() ||
 			!sqlMode.HasNoZeroDateMode() || !strictSQLMode || ignoreErr ||
-			sqlMode.HasAllowInvalidDatesMode())
+			sqlMode.HasAllowInvalidDatesMode()).
+		WithAllowNegativeToUnsigned(false)
 }
 
 // GetTypeFlagsForImportInto gets the type flags for import into statement which

tests/realtikvtest/importintotest2/from_select_test.go

@@ -155,3 +155,12 @@ func (s *mockGCSSuite) TestImportFromSelectStaleRead() {
 	s.tk.MustExec("import into dst from " + staleReadSQL)
 	s.tk.MustQuery("select * from dst").Check(testkit.Rows("1 a", "2 b"))
 }
+
+func (s *mockGCSSuite) TestCastNegativeToUnsigned() {
+	s.prepareAndUseDB("from_select")
+	s.tk.MustExec("create table dt(id int unsigned)")
+	s.ErrorContains(s.tk.ExecToErr("import into dt from select -1"), "constant -1 overflows int")
+	s.tk.MustExec("set sql_mode=''")
+	s.tk.MustExec("import into dt from select -1")
+	s.tk.MustQuery("select * from dt").Check(testkit.Rows("0"))
+}