[GitHub] [arrow-rs] tustvold commented on issue #506: "Optimize" Dictionary contents in DictionaryArray / `concat_batches`

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tustvold commented on issue #506:
URL: https://github.com/apache/arrow-rs/issues/506#issuecomment-870466395


   So another option I've been thinking about, is instead of optimizing the RecordBatches after the fact, to optionally generate better RecordBatches in the first place. This is similar to what is proposed in #504 but perhaps more general.
   
   The basic idea would be to extend MutableArrayData with a flag to recompute dictionaries on freeze, I already have a fairly good idea of how to implement this. Variants of the concat, take, etc... kernels could then make use of this. An optimize batch function would effectively be just this variant take kernel. 
   
   Additionally DataFusion operators such as [SortPreservingMerge](https://github.com/apache/arrow-datafusion/blob/master/datafusion/src/physical_plan/sort_preserving_merge.rs#L433) that use MutableArrayData directly could also benefit from this.
   
   I'd be happy to implement this if people are happy for me to


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