tanruixiang commented on issue #7185:
URL:
https://github.com/apache/arrow-datafusion/issues/7185#issuecomment-1664050608
> `_` has special meaning in SQL regex syntax, specifically matching any
single character. Thus I am not sure the rewrite you propose is correct
Hi @alamb, Thank you very much for your reply.
`_` has special meaning just in `Like`, Postgres(or mysql) use the `~` to
do the regex match.
If it's just the test cases I've given, there should be no correctness
issues, but I'm not sure if the current complex datafusion rewrite rules cause
`Like` to be hidden. Strings with `_` should be very common in the data, and if
the current optimization framework doesn't support it, maybe we need to
redesign the optimization framework.
```
test_db=> select 'id_1' ~ '^(id_1)$';
?column?
----------
t
(1 row)
test_db=> select 'id1' ~ '^(id_1)$';
?column?
----------
f
(1 row)
test_db=> select 'id%1' ~ '^(id_1)$';
?column?
----------
f
(1 row)
test_db=> select 'idt1' ~ '^(id_1)$';
?column?
----------
f
(1 row)
``
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