zy-kkk opened a new pull request, #34516:
URL: https://github.com/apache/doris/pull/34516
## Proposed changes
Issue Number: close #xxx
This PR supports a Table Value Function called `Query`. He can push a query
directly to the catalog source for execution by specifying `catalog_name` and
`query` without parsing by Doris. Doris only receives the results returned by
the query.
Currently only MySQL and SAP HANA in JDBC Catalog are supported.
Example:
```
Doris > desc function query('catalog_name' = '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_name' = 'mysql','query' = 'select
count(*) as cnt from test.test');
+----------+
| cnt |
+----------+
| 30000000 |
+----------+
```
## Further comments
If this is a relatively large or complex change, kick off the discussion at
[d...@doris.apache.org](mailto:d...@doris.apache.org) by explaining why you
chose the solution you did and what alternatives you considered, etc...
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