erenavsarogullari opened a new pull request, #14470:
URL: https://github.com/apache/datafusion/pull/14470
## Which issue does this PR close?
Closes #14469.
## What changes are included in this PR?
Currently, Spark, Snowflake and Presto support `array_max` function. This
can also be useful for DataFusion.
```
array_max(make_array(3,1,4,2)) => 4
array_max(make_array('h','e','o','l','l',NULL)) => o
array_max(make_array(NULL,NULL)) => NULL
```
Spark:
https://docs.databricks.com/en/sql/language-manual/functions/array_max.html
Snowflake: https://docs.snowflake.com/en/sql-reference/functions/array_max
Presto: https://prestodb.io/docs/current/functions/array.html#array_max-x-x
All potential use-cases have been covered like different `data_types`,
`empty array`, `NULL` etc.
## Are these changes tested?
Added new UT cases to verify `array_max` function in terms of different
source arrays.
## Are there any user-facing changes?
Yes, new SQL function is supported and documentation has also be updated.
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