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<>Apache Doris列转行
<>Lateral View
<>description
Lateral view 语法可以搭配 Table Function,完成将一行数据扩展成多行(列转行)的需求。
语法:
... FROM table_name lateral_view_ref[ lateral_view_ref ...] lateral_view_ref:
LATERAL VIEW table_function(...) view_alias as col_name
Lateral view 子句必须跟随在表名或子查询之后。可以包含多个 Lateral view 子句。view_alias 是对应 Lateral
View 的名称。col_name 是表函数 table_function 产出的列名。
目前支持的表函数:
* explode_split
* explode_bitmap
* explode_json_array
具体函数说明可参阅对应语法帮助文档。
table 中的数据会和各个 Lateral View 产生的结果集做笛卡尔积后返回上层。
<>example
这里只给出 Lateral View 的语法示例,具体含义和产出的结果说明,可参阅对应表函数帮助文档。
*