add miss for trim

Author: elianddb

sql/expression/function/trim_ltrim_rtrim.go

@@ -219,6 +219,12 @@ func (t *LeftTrim) Eval(ctx *sql.Context, row sql.Row) (interface{}, error) {
 		return nil, sql.ErrInvalidType.New(reflect.TypeOf(str))
 	}
 
+	// Handle Dolt's TextStorage wrapper that doesn't convert to plain string
+	str, err = sql.UnwrapAny(ctx, str)
+	if err != nil {
+		return nil, err
+	}
+
 	return strings.TrimLeftFunc(str.(string), func(r rune) bool {
 		return r == ' '
 	}), nil
@@ -282,6 +288,12 @@ func (t *RightTrim) Eval(ctx *sql.Context, row sql.Row) (interface{}, error) {
 		return nil, sql.ErrInvalidType.New(reflect.TypeOf(str))
 	}
 
+	// Handle Dolt's TextStorage wrapper that doesn't convert to plain string
+	str, err = sql.UnwrapAny(ctx, str)
+	if err != nil {
+		return nil, err
+	}
+
 	return strings.TrimRightFunc(str.(string), func(r rune) bool {
 		return r == ' '
 	}), nil