Implement better enum error handling following issue 9424 approach

- Add ErrDataTruncatedForColumnAtRow error type
- Convert ErrConvertingToEnum to proper error with row number
- Track row numbers in insert iterator for accurate error reporting
- Update test expectations to use new error format
- INSERT IGNORE functionality now works correctly for enum conversion

Based on successful solution from issue 9424 PR #3074

Author: elianddb

enginetest/queries/insert_queries.go

@@ -2836,7 +2836,7 @@ var InsertIgnoreScripts = []ScriptTest{
 		Assertions: []ScriptTestAssertion{
 			{
 				Query:       "insert into test_table values (1, 'invalid'), (2, 'comparative politics'), (3, null)",
-				ExpectedErr: types.ErrConvertingToEnum, // TODO: should be ErrDataTruncatedForColumn
+				ExpectedErr: types.ErrDataTruncatedForColumnAtRow,
 			},
 			{
 				Query:    "insert ignore into test_table values (1, 'invalid'), (2, 'bye'), (3, null)",

sql/rowexec/insert.go

@@ -144,6 +144,8 @@ func (i *insertIter) Next(ctx *sql.Context) (returnRow sql.Row, returnErr error)
 						cErr = types.ErrLengthBeyondLimit.New(row[idx], col.Name)
 					} else if sql.ErrNotMatchingSRID.Is(cErr) {
 						cErr = sql.ErrNotMatchingSRIDWithColName.New(col.Name, cErr)
+					} else if types.ErrConvertingToEnum.Is(cErr) {
+						cErr = types.ErrDataTruncatedForColumnAtRow.New(col.Name, i.rowCount)
 					} else if types.ErrDataTruncatedForColumn.Is(cErr) {
 						cErr = types.ErrDataTruncatedForColumn.New(col.Name, i.rowCount)
 					}

sql/types/enum.go

@@ -42,7 +42,8 @@ const (
 var (
 	ErrConvertingToEnum = errors.NewKind("value %v is not valid for this Enum")
 
-	ErrDataTruncatedForColumn = errors.NewKind("Data truncated for column '%s' at row %d")
+	ErrDataTruncatedForColumn      = errors.NewKind("Data truncated for column '%s'")
+	ErrDataTruncatedForColumnAtRow = errors.NewKind("Data truncated for column '%s' at row %d")
 
 	enumValueType = reflect.TypeOf(uint16(0))
 )