Apache Pinot

Hi, all. Is it possible to change the Key of JSON Field to lower case?

For example,

```{
        "columnName": "converted_json",
        "transformFunction": "map_keys(raw_json, x -&gt; lower(x))"
}```


There is no embedded function for this. You may implement and plug-in your own scalar function, or use groovy based function to achieve that

For reference: <https://docs.pinot.apache.org/developers/advanced/ingestion-level-transformations>

Hi, Jackie. I will take a look the guide. Thanks!