[GitHub] [arrow] davisusanibar commented on issue #36903: [Java] dataset usage example and documentation

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

davisusanibar commented on issue #36903:
URL: https://github.com/apache/arrow/issues/36903#issuecomment-1655670435

   Hi @zinking ,
   
   Here's my cent on some of your doubts:
    
   > how to set a filter?
   
   This PR (33877) is conditional on 14287, which was closed for inactivity.
   
   This is another [PR](https://github.com/apache/arrow/pull/35570) that is using Substrait Extended Expression to implement Projection & Filter throughout Substrait definitions. You could see an example at [TestAddConcatFilter](https://github.com/apache/arrow/blob/d57517e0e0051fed3e206616757a59d9bebf6507/java/dataset/src/test/java/org/apache/arrow/dataset/substrait/TestAceroSubstraitConsumer.java#L210:L249). 
   
   > how to set offset and length when reading parquet file?
   
   This is not supported currently. Read more about this so I can determine if it's a Java restriction or a requirement for C++ base core implementation.
   
   


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