lightjacket opened a new issue #1604:
URL: https://github.com/apache/arrow-datafusion/issues/1604
**Is your feature request related to a problem or challenge? Please describe
what you are trying to do.**
I'm looking at add an inverted index on my data and use it as the first step
in more complicated data transformations. There's particular optimization that
I think might be better done outside of the DataFusion engine.
**Describe the solution you'd like**
I'm imagining something like the following, where `inverted_index_search`
returns an arbitrary number of rows.
```
SELECT inverted_index_search('some query');
```
```
+------+
| id |
+------+
| 1 |
| 2 |
+------+
```
I'd like to be able to write a udf (or udaf, or something new) that can
return as many rows as it needs.
**Describe alternatives you've considered**
I looked at having my UDF return an array, but once I had the array I could
not figure out how to unnest it. Issue
https://github.com/apache/arrow-datafusion/issues/212 looks to cover that, but
I think it might be better to just have the function return multiple rows
directly.
**Additional context**
Apologies if I missed something that is already available for this.
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