zy-kkk opened a new pull request, #35771:
URL: https://github.com/apache/doris/pull/35771
## Proposed changes
pick #34516,#34779
This PR supports a Table Value Function called `Query`. He can push a query
directly to the catalog source for execution by specifying `catalog` and
`query` without parsing by Doris. Doris only receives the results returned by
the query. Currently only JDBC Catalog is supported.
Example:
```
Doris > desc function query('catalog' = 'mysql','query' = 'select count(*)
as cnt from test.test');
+-------+--------+------+------+---------+-------+
| Field | Type | Null | Key | Default | Extra |
+-------+--------+------+------+---------+-------+
| cnt | BIGINT | Yes | true | NULL | NONE |
+-------+--------+------+------+---------+-------+
Doris > select * from query('catalog' = 'mysql','query' = 'select count(*)
as cnt from test.test');
+----------+
| cnt |
+----------+
| 30000000 |
+----------+
```
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