andygrove commented on PR #3500:
URL: 
https://github.com/apache/datafusion-comet/pull/3500#issuecomment-3893092573

   ## CI Failure Comparison: PR #3500 (post-fix) vs df52 base (#3470)
   
   This compares the latest CI run of PR #3500 (commit `98bae1c2e`, with the 
ParquetFieldIdIOSuite fix) against the latest df52 branch CI (#3470).
   
   ### Improvements in PR #3500 vs df52 base
   
   | Test Suite | df52 (#3470) | PR #3500 | Notes |
   |---|---|---|---|
   | **`ParquetV1SchemaPruningSuite`** | 3 jobs FAIL (44 failures each) | **ALL 
PASS** | Fixed by this PR's schema pruning changes |
   | **`SQLQueryTestSuite`** | 2 jobs FAIL | **ALL PASS** | Fixed by this PR |
   | **`sql_core-2` (all configs)** | 4/4 FAIL | **4/4 PASS** | All passing now 
|
   
   ### Pending (still running)
   
   | Check | Status | Notes |
   |---|---|---|
   | `sql_core-1` (all Spark versions) | IN_PROGRESS | Will confirm if 
`ParquetFieldIdIOSuite` fix works |
   | `sql_core-3`, `sql_hive-1` | IN_PROGRESS | |
   
   ### Same failures on both PRs (pre-existing on df52)
   
   | Failure | Jobs | Root Cause | Tracked In |
   |---|---|---|---|
   | Scalafix unused import (`CometExprShim.scala:32`) | All Spark 4.0 jobs (14 
jobs) | Unused imports in Spark 4.0 shim | Needs fix in df52 |
   | `select column with default value` | native_datafusion fuzz (2 tests) | 
Native c2r returns null instead of default | #3482 |
   | Miri build failure | All branches | Stale toolchain cache | #3499, fix in 
#3504 |
   
   ### Summary
   
   The schema pruning fix in this PR resolves **48+ test failures** 
(`ParquetV1SchemaPruningSuite` + `SQLQueryTestSuite`) that exist on the df52 
base branch. The `sql_core-1` jobs are still running and will confirm whether 
the `ParquetFieldIdIOSuite` regression (from the previous commit) has been 
fixed by the fallback guard added in commit `98bae1c2e`.


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