TiDB 字符串行转列与 JSON 数据查询优化知识笔记一、长字符串行转列方案sql SET @str = ‘a,b,c,d’; SELECT jt.val, jt.pos FROM JSON_TABLE( CONCAT(‘[’, REPLACE(@str, ‘,’, ‘“,”’), ‘"]’), ‘ [ ∗ ] ′ C O L U M N S ( v a l V A R C H A R ( 255 ) P A T H ′ [*]' COLUMNS ( val VARCHAR(255) PATH ' [∗]′COLUMNS(valVARCHAR(255)PAT