morningman commented on pull request #6493:
URL: https://github.com/apache/incubator-doris/pull/6493#issuecomment-904445979
Can we use hint to implement this? It is more flexible. Adding keywords may
be conflict with other grammar in future.
```
select * from estbl /*+ ES_INDEX('test_2021-05-20', 'test_2021-05-21',
'test_2021-06-*') */ where xxxx
```
You can refer to `opt_select_hints` in `sql_parser.cup`.
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