alamb opened a new pull request, #24426:
URL: https://github.com/apache/datafusion/pull/24426

   ## Which issue does this PR close?
   
   - Part of https://github.com/apache/datafusion/issues/24393
   - Part of https://github.com/apache/datafusion/issues/20324
   
   **Note: this is a benchmarking prototype and is NOT intended for merge or 
review.**
   
   Stacked on https://github.com/apache/datafusion/pull/24395 (the 
`progressive_io` option).
   
   ## Rationale for this change
   
   Measure whether enabling `pushdown_filters` by default can now match or beat 
today's ClickBench performance when the I/O pattern is kept the same as today 
(one request per row group), i.e. with `progressive_io = false` (the default 
introduced in #24395).
   
   ## What changes are included in this PR?
   
   - The `progressive_io` commit from #24395
   - Flips the default of `datafusion.execution.parquet.pushdown_filters` to 
`true` (`progressive_io` stays `false`, so scans still fetch each row group's 
data in a single request)
   
   ## Are these changes tested?
   
   Benchmark runs only (`clickbench_partitioned`, with and without simulated 
object store latency); results to be posted below. Other tests that encode the 
pushdown-off default are expected to fail and are not being fixed in this 
prototype.
   
   ## Are there any user-facing changes?
   
   Not intended for merge as-is.


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