apache / apache/parquet-java

Improve performance when filters in RowGroupFilter can match exactly

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Component: Parquet Priority: Major Type: enhancement
主要言語
Java
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平均マージ
3日 12時間
マージ済み PR(30日)
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説明

If we can accurately judge by the minMax status, we don’t need to load the dictionary from filesystem and compare one by one anymore.

Similarly , Bloomfilter needs to load from filesystem, it may costs time and memory. If we can exactly determine the existence/nonexistence of the value from minMax or dictionary filters , then we can avoid using Bloomfilter to Improve performance.

For example,
1. read data greater than `x1` in the block, if minMax in status is all greater than `{}x1{`}, then we don't need to read dictionary and compare one by one.
1. If we already have page dictionaries and have compared one by one, we don't need to read BloomFilter and compare.

**Reporter**: [Mars](https://issues.apache.org/jira/secure/ViewProfile.jspa?name=miracle) / @yabola
**Assignee**: [Mars](https://issues.apache.org/jira/secure/ViewProfile.jspa?name=miracle) / @yabola

**Note**: *This issue was originally created as [PARQUET-2237](https://issues.apache.org/jira/browse/PARQUET-2237). Please see the [migration documentation](https://issues.apache.org/jira/browse/PARQUET-2502) for further details.*

コントリビューションガイド

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調査の方向性

Start by locating RowGroupFilter and tracing how minMax, page dictionaries, and Bloomfilter are evaluated. Confirm how exact minMax or dictionary results can skip later filesystem reads, then verify the behavior and performance with the relevant existing checks; the issue names no files or tests, so those must be identified first.

索引モデルが issue の本文から書いたものです。

評価

技術スタック
java
領域
data-engineering
issue の種類
機能追加
難易度
4/5
見積もり時間
3〜5日
活発さ
停滞
明瞭さ
おおむね明確
初心者へのやさしさ
35/100

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