Parquet: Fix variant metrics crash when value column has no stats#16585
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wombatu-kun
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Jun 7, 2026
wombatu-kun
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@Fokko PTAL when you get a chance. |
huaxingao
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Jun 20, 2026
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Thanks @nssalian for the PR! Thanks @wombatu-kun for the review! |
jakelong95
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Jun 29, 2026
…ache#16585) * Parquet: Fix variant metrics crash when value column has no stats * Fixup after 16327
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Closes #16567
Rationale for this change
Spark writes to Iceberg tables with shredded VARIANT columns crash with
NoSuchElementExceptionduringDataWriter.close()when the variantvaluesub-column has no usable parquetStatistics. Matches the iceberg-go #932 approach for variant sub-columns lacking stats.What changes are included in this PR?
MetricsVariantVisitor.value()returns empty bounds whenvalueResultis empty, instead of callingIterables.getOnlyElementon it.Are these changes tested?
Yes.
testShreddedValueColumnWithEmptyStatswrites a shredded variant with parquet stats disabled. Fails with the issue's exact stack trace without the fix; passes with it.Are there any user-facing changes?
No. Crash becomes graceful drop of bounds for the affected variant column.