apache / apache/parquet-java

Improve performance when filters in RowGroupFilter can match exactly

Aperta
#1,655 0 commenti 0 reazioni 0 assegnatari Vedi su GitHub
Component: Parquet Priority: Major Type: enhancement
Lingua principale
Java
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Descrizione

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.*

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Direzione di ricerca

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.

Scritto dal modello di indicizzazione a partire dal testo della issue.

Valutazione

Stack tecnologico
java
Ambito
data-engineering
Tipo di issue
Funzionalità
Difficoltà
4/5
Tempo stimato
3-5 giorni
Stato di attività
Ferma
Chiarezza
Abbastanza chiara
Idoneità per principianti
35/100

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