adriangb opened a new issue, #19356:
URL: https://github.com/apache/datafusion/issues/19356

   As discussed in https://github.com/apache/datafusion/pull/19335 it would be 
nice to have a function `arrow_metadata` similar to `arrow_typeof` that returns 
the metadata from it's input field as a `Map<String, String>` column. Ideally 
it could support two signatures `arrow_metadata(column_or_expr) -> Map<String, 
String>` and `arrow_metadata(column_or_expr, 'key') -> String`.


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