[GitHub] [arrow-rs] tustvold opened a new issue, #1536: Create RecordBatch With Non-Zero Row Count But No Columns

[GitBox <gi...@apache.org>]

tustvold opened a new issue, #1536:
URL: https://github.com/apache/arrow-rs/issues/1536

   **Is your feature request related to a problem or challenge? Please describe what you are trying to do.**
   
   Certain queries may only be interested in the number of rows, and not any actual column data. In theory this could be handled as a projection pushdown that selects no columns, but currently there is no way to create a RecordBatch with no columns and a non-zero row count and so this doesn't work.
   
   **Describe the solution you'd like**
   
   I would like `RecordBatch` to store the `row_count` as a struct member, and allow this to be specified in `RecordBatchOptions` 
   
   **Describe alternatives you've considered**
   
   We could not make this change
   
   **Additional context**
   
   This problem can also arise when using Hive style partitioning, where the underlying file data may not contain all columns - https://github.com/apache/arrow-datafusion/pull/2000
   


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[GitHub] [arrow-rs] alamb closed issue #1536: Create RecordBatch With Non-Zero Row Count But No Columns

[GitBox <gi...@apache.org>]

alamb closed issue #1536: Create RecordBatch With Non-Zero Row Count But No Columns
URL: https://github.com/apache/arrow-rs/issues/1536


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