#15510 Parquet: Support row group skipping for shredded variant columns#16133
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steveloughran wants to merge 4 commits into
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#15510 Parquet: Support row group skipping for shredded variant columns#16133steveloughran wants to merge 4 commits into
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This doesn't get called from spark until multiple PRs are merged: |
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…kipping copilot's solution to why pushdown wasn't working, independent of qlong's apache#15385 I plan to take qlong's and pull what is extra from this one.
ParquetMetricsRowGroupFilter.compareVariant() implements comparisons for variants, including NaN, null, uuid, set membership. * New ParquetVariantUtil splitter regexp can't cope with columns called ]. That's OK as normalisation forbids that and empty paths * Copilot wrote the tests so it's over-verbose, but thorough. * including NaN behaviour and string truncation on max values. * lazy build of variant mapping info, cached for entire file. There's no concurrency handling here in the build up of that lazy structure, once happy with the design it'll need to be locked down better. TestSparkVariantFilterPushDown to test variant pushdown through spark This needs a modified spark, currently. A counter is exported from ParquetMetricsRowGroupFilter to assist here; it should be culled eventually.
Change-Id: I0be25227711dc9c605a5070cfdfea40ffda53674
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big milestone reached today w/ spark and parquet all lined up. Got a stack trace saying can't deser variant as the bytebuffer is in the wrong order. This could potentially mean that predicate pushdown is working down but some bytebuffer is OOO. Or it is something unrelated. New stack though |
Change-Id: I6f402fe1e5bf65e51d79010efeb64e2c549e1d5f
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ParquetMetricsRowGroupFilter.compareVariant() implements comparisons for variants, including NaN, null.
Fixes #15510
Testing notes
Full branch with this, Qlong's api changes and the benchmark is https://github.com/steveloughran/iceberg/tree/pr/variant-rowgroups-benchmark
Does need a matching spark version.