看mysql的相关文档：
• TEXT columns can only be indexed for a specified length. MySQL doesn’t index the full length of TEXT data types (except for full-text search indexes).
• The full length of the string can’t be used for sorting.
• Queries involving TEXT columns can lead to the creation of a temporary table on disk instead of in memory. This is because MySQL’s memory storage engine does not support TEXT data types. There is a significant performance penalty to using disk-based tables, which means queries using TEXT can be much slower.
• TEXT data may be stored off the table, with a pointer to the string stored on the table. Accessing data stored in this way is slower. VARCHAR data is always stored on the table. If data is frequently retrieved, inline storage offers faster performance.
请问，TiDB这里的TEXT data也是 stored off the table，Accessing data stored in this way is slower 吗