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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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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