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QUERY

描述

query 表函数(table-valued-function,tvf),可用于将查询语句直接透传到某个 catalog 进行数据查询

Doris 2.1.3 版本开始支持,当前仅支持透传查询 jdbc catalog。 需要先在 Doris 中创建对应的 catalog。

语法

QUERY(
"catalog" = "<catalog>",
"query" = "<query_sql>"
);

必填参数

query表函数 tvf中的每一个参数都是一个 "key"="value"

字段描述
catalogcatalog名称,需要按照catalog的名称填写
query需要执行的查询语句

举例

可以配合desc function使用

desc function query("catalog" = "jdbc", "query" = "select * from test.student");
+-------+------+------+-------+---------+-------+
| Field | Type | Null | Key | Default | Extra |
+-------+------+------+-------+---------+-------+
| id | int | Yes | true | NULL | |
| name | text | Yes | false | NULL | NONE |
+-------+------+------+-------+---------+-------+

透传查询 jdbc catalog 数据源中的表

select * from query("catalog" = "jdbc", "query" = "select * from test.student");
+------+---------+
| id | name |
+------+---------+
| 1 | alice |
| 2 | bob |
| 3 | jack |
+------+---------+
select * from query("catalog" = "jdbc", "query" = "select * from test.score");
+------+---------+
| id | score |
+------+---------+
| 1 | 100 |
| 2 | 90 |
| 3 | 80 |
+------+---------+

透传关联查询 jdbc catalog 数据源中的表

select * from query("catalog" = "jdbc", "query" = "select a.id, a.name, b.score from test.student a join test.score b on a.id = b.id");
+------+---------+---------+
| id | name | score |
+------+---------+---------+
| 1 | alice | 100 |
| 2 | bob | 90 |
| 3 | jack | 80 |
+------+---------+---------+