HippoBaro commented on code in PR #9697:
URL: https://github.com/apache/arrow-rs/pull/9697#discussion_r3083332852


##########
parquet/src/arrow/push_decoder/reader_builder/mod.rs:
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@@ -610,6 +617,12 @@ impl RowGroupReaderBuilder {
                     &mut self.buffers,
                 )?;
 
+                // All data for this row group has been extracted into the
+                // InMemoryRowGroup.  Release physical buffers up to the end
+                // of this row group so streaming IO can reclaim memory.
+                self.buffers

Review Comment:
   Thank to you both, I wasn't aware of this! This certainly changes things. My 
watermark approach was nice and optimal, but this makes it fundamentally 
flawed. Oh well, back to the drawing board! 



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