ErikBPF commented on issue #5964:
URL: 
https://github.com/apache/datafusion-comet/issues/5964#issuecomment-5691442726

   Update: the investigation now includes SQL-level regression coverage, beyond 
the earlier decoder probe. The parquet-java fix is published as 
apache/parquet-java#3796, with reproduction tracked in 
apache/parquet-java#3795. Its current-master port passes 112 targeted tests 
plus Spotless and package checks.
   
   The isolated Spark candidate selects the first physical root descriptor 
while retaining requested field IDs and suppresses ambiguous predicate pushdown 
without dropping logical filters. Targeted release-based owner checks pass: 8 
duplicate-root tests and 101 filter tests, with scalastyle clean. No Spark PR 
has been opened yet: JIRA tracking, a current-master port and a normal 
published parquet dependency pin remain prerequisites.
   
   These are bounded experimental and targeted-module results, not released 
fixes or full-reactor certification. Simultaneous aliases and duplicate nested, 
encrypted or non-vectorized reads remain outside validated scope. Anomalous 
Spark values are not adopted as desired behavior.


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