Push down filter as table partition list prefix #10693
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alamb
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May 29, 2024
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| &[Expr::and( | ||
| Expr::eq(col("a"), lit("foo")), | ||
| Expr::eq(col("b"), lit("bar")), | ||
| )], |
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You can write this kind of expression more simply like col("a").eq(lit("foo")).and(col("b").eq(lit("bar"))) though maybe what you have is more readable
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the eq helper improves readability, i applied that to all tests. i do agree with you that the .and helper makes the expression less readable.
| // no prefix when filter is empty | ||
| assert_eq!(evaluate_partition_prefix(partitions, &[]), None); | ||
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|
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| // b=foo results in no prefix because a is not restricted |
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I recommend adding some other tests:
- another negative test like
a < 5to cover the fact that only=predicates are allowed - A test with the literal and constant swapped (
foo = a)
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This was referenced May 31, 2024
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Rationale for this change
When applicable, table partition listing can be optimized by deriving a listing prefix based on literals provided in the filter predicates.
For a selected table with many partitions, this change reduces query time from minutes to 200ms.
What changes are included in this PR?
stacked on top of Display date32/64 in YYYY-MM-DD format #10691. please review that PR first.evaluate_partition_prefixfunction to derive a listing prefix based on filter predicates and table partitions.list_partitionsextended to take an optional prefix argument.Are these changes tested?
Tested with unit tests.
Are there any user-facing changes?
No