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" 对

字段	描述
catalog	catalog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      |
+------+---------+---------+