fix: enable FIRST/LAST partial merge - #5041
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comphead merged 5 commits intoSep 9, 2026
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cc @comphead ptal, thanks! |
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Thanks @peterxcli it looks good to me, btw can we try to move impacted tests from suites to sql files if that possible
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Hm, this PR ran incomplete CI |
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done, thanks for the suggestion! |
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Which issue does this PR close?
Closes #4131.
Rationale for this change
DataFusion LAST_VALUE partial-state merging filtered unset states but selected element 0 from the final state array instead of its last element. This could make Comet produce a different result from Spark, so Comet temporarily fell back for FIRST/LAST in PartialMerge mode.
Upstream
mainuses DataFusion 55.0.0 and Arrow/Parquet 59.2.0 through merged #5262. The dependency upgrade is no longer a blocker. The root fix, apache/datafusion#23905, is included in DataFusion 55.0.0.What changes are included in this PR?
How are these changes tested?
The following results are from the backport-based draft, not a DataFusion 55.0.0 validation run. Rerun them after the rebase and dependency-pin cleanup.
cargo build --lockedJAVA_HOME=/Users/lixucheng/.sdkman/candidates/java/17.0.14-zulu make coreJAVA_HOME=/Users/lixucheng/.sdkman/candidates/java/17.0.14-zulu DYLD_LIBRARY_PATH=/Users/lixucheng/.sdkman/candidates/java/17.0.14-zulu/lib/server ./mvnw test -Dtest=none -Dsuites="org.apache.comet.CometSqlFileTestSuite partial_merge" -Dscalastyle.skip=trueThe focused SQL suite passed both Parquet dictionary configurations: 2 tests run, 2 succeeded.