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[EPIC] Parquet filter pushdown into scan #3462

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@alamb

Is your feature request related to a problem or challenge? Please describe what you are trying to do.
DataFusion offers sophisticated "filter pushdown" optimizations into LogicalPlan::TableScan by passing predicates into TableProvider::scan.

This ticket tracks the work to make use of these predicates in the table provider for parquet files, ParquetFileReader. Much of this work has been completed by the writing of this ticket, but I wanted to try and capture it here to both show how far DataFusion has come as well as how close we are to done

There are three types of predicate pushdown:

  • Prune row groups based on statistics (do not fetch or decode any pages)
  • Prune column pages based on page level statistics, skip decode of corresponding positions in other columns:
  • Prune row indexes based on Expr predicates, and skip decode of corresponding positions in other columns

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Activity

  1. changed the title [-][EPIC] Parquet filter pushdown[/-] [+][EPIC] Parquet filter pushdown into scan[/+] on Oct 11, 2022
  2. alamb commented on Jan 8, 2024

    @alamb
    ContributorAuthor

    We are so close to making this happen -- the last thing is to be able to turn the predicate pushdown on by default

  3. added
    EPICA larger project, actively underway, with sub tasks
    on Aug 12, 2025
  4. alamb commented on Feb 13, 2026

    @alamb
    ContributorAuthor

    Let's continue this project with this ticket

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