ovr commented on pull request #9139:
URL: https://github.com/apache/arrow/pull/9139#issuecomment-757169119
Thank you, @jorgecarleitao, for your review. I've added tests + fix handling
null values.
I've compared it with PostgreSQL, and It works as expected.
```sql
select
md5('tom') AS md5_tom,
md5('') AS md5_empty_str,
md5(null) AS md5_null,
encode(sha224('tom'), 'hex') AS sha224_tom,
encode(sha224(''), 'hex') AS sha224_empty_str,
sha224(null) AS sha224_null;
```
```json
[
{
"md5_tom": "34b7da764b21d298ef307d04d8152dc5",
"md5_empty_str": "d41d8cd98f00b204e9800998ecf8427e",
"md5_null": null,
"sha224_tom": "0bf6cb62649c42a9ae3876ab6f6d92ad36cb5414e495f8873292be4d",
"sha224_empty_str":
"d14a028c2a3a2bc9476102bb288234c415a2b01f828ea62ac5b3e42f",
"sha224_null": null
}
]
```
Thanks
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