[GitHub] [arrow] westonpace commented on issue #34266: [C++] Add a pivot_longer node

["westonpace (via GitHub)" <gi...@apache.org>]

westonpace commented on issue #34266:
URL: https://github.com/apache/arrow/issues/34266#issuecomment-1438830778

   It appears that DuckDb has tackled the [pivot feature](https://github.com/duckdb/duckdb/pull/6387) at the same time (and their implementation is much more complete).  They use unnest for pivot longer but it's not clear to me that we could do the same thing here.  It relies on the ability to create a sort of list comprehension out of field references to convert field references to elements into a field reference to a list element  (I'm not sure exactly what this syntax is called).  It's quite impressive :)


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