guiyanakuang opened a new pull request #1057:
URL: https://github.com/apache/orc/pull/1057


   ### What changes were proposed in this pull request?
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   Add `estimationMemory` method for writer. It exposes the internal treeWriter 
to estimate the memory used for the buffer.
   
   ### Why are the changes needed?
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     1. If you propose a new API, clarify the use case for a new API.
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   This method help the write engine to better control the refresh policy of 
the ORC.
   
   The source of this issue comes from Iceberg's discussion.
   https://lists.apache.org/thread/g6yo7m46mr86ov1vkm9wnmshgw7hcl6b
   
   ### How was this patch tested?
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   Pass the CIs


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