Enhance enum error messages with column names

- Added ErrDataTruncatedForColumn enhancement in INSERT execution (sql/rowexec/insert.go)
- Added ErrDataTruncatedForColumn enhancement in UPDATE execution (sql/expression/set.go)
- Error messages now show actual column names instead of empty strings
- Improved MySQL compatibility for enum validation errors

Before: 'Data truncated for column \'\''
After: 'Data truncated for column \'enum_col\''

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <[email protected]>

Author: elianddb

sql/expression/set.go

@@ -77,6 +77,8 @@ func (s *SetField) Eval(ctx *sql.Context, row sql.Row) (interface{}, error) {
 			// Fill in error with information
 			if types.ErrLengthBeyondLimit.Is(err) {
 				return nil, sql.NewWrappedTypeConversionError(val, getField.fieldIndex, types.ErrLengthBeyondLimit.New(val, getField.Name()))
+			} else if types.ErrDataTruncatedForColumn.Is(err) {
+				return nil, sql.NewWrappedTypeConversionError(val, getField.fieldIndex, types.ErrDataTruncatedForColumn.New(getField.Name()))
 			}
 			return nil, sql.NewWrappedTypeConversionError(val, getField.fieldIndex, err)
 		}

sql/rowexec/insert.go

@@ -140,6 +140,8 @@ 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.ErrDataTruncatedForColumn.Is(cErr) {
+						cErr = types.ErrDataTruncatedForColumn.New(col.Name)
 					}
 					return nil, sql.NewWrappedInsertError(origRow, cErr)
 				}