Parquet: Add dedicated Select method that can be used to push selection vectors into the read #16174
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…s into the read
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Parquet: Add dedicated Select method that can be used to push selection vectors into the read (duckdb/duckdb#16174) [CI] Avoid Linux CLI jobs to fail-fast (duckdb/duckdb#16173)
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Parquet: Add dedicated Select method that can be used to push selection vectors into the read (duckdb/duckdb#16174) [CI] Avoid Linux CLI jobs to fail-fast (duckdb/duckdb#16173)
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Parquet: Add dedicated Select method that can be used to push selection vectors into the read (duckdb/duckdb#16174) [CI] Avoid Linux CLI jobs to fail-fast (duckdb/duckdb#16173)
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Parquet: Add dedicated Select method that can be used to push selection vectors into the read (duckdb/duckdb#16174) [CI] Avoid Linux CLI jobs to fail-fast (duckdb/duckdb#16173)
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Parquet: Add dedicated Select method that can be used to push selection vectors into the read (duckdb/duckdb#16174) [CI] Avoid Linux CLI jobs to fail-fast (duckdb/duckdb#16173)
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Parquet: Add dedicated Select method that can be used to push selection vectors into the read (duckdb/duckdb#16174) [CI] Avoid Linux CLI jobs to fail-fast (duckdb/duckdb#16173)
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This effectively restores a previous optimization where we would skip reading elements if they were previously filtered out. For now we only enable this for strings - that has by far the highest performance benefits as we can skip UTF8 validation for any strings that we don't need to read.
For simple types like integers this optimization is not so straightforwardly useful - as we effectively replace a
memcpywith a branchy lookup. I haven't run any benchmarks on this yet but I suspect that the usefulness of this optimization depends on selectivity - i.e. it might perform better when the selectivity is <10% (or some other to be determined threshold). I will leave that for a future PR.