parthchandra commented on PR #21508: URL: https://github.com/apache/datafusion/pull/21508#issuecomment-4239762029
There are some tricky cases that will likely not get parsed correctly -
opening/closing parens inside a quoted string, `]` inside an array element,
nested cast.
```
arrow_cast(regexp_replace(x, ')', ''), 'Utf8')
SELECT ['a]b', 'c']
SELECT [['a]b', 'c'], ['d', 'e']]
SELECT coalesce(x, ')')::TEXT
SELECT coalesce('(', x)::TEXT
SELECT CAST(CAST(x AS FLOAT8) AS FLOAT8)
```
We could document these if they turn out to be hard to address.
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