[common] Introduce BitmapFileIndexMetaV2. #4956
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added 9 commits
January 20, 2025 16:47
JingsongLi
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Jan 24, 2025
paimon-common/src/main/java/org/apache/paimon/fileindex/bitmap/BitmapFileIndex.java
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January 24, 2025 18:19
Tan-JiaLiang
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Feb 5, 2025
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@hang8929201 Thank you so much for your contribution! Almost looks good, just left some comments.
paimon-common/src/main/java/org/apache/paimon/fileindex/bitmap/BitmapFileIndexMetaV2.java
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paimon-common/src/main/java/org/apache/paimon/fileindex/bitmap/BitmapFileIndexMetaV2.java
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paimon-common/src/main/java/org/apache/paimon/fileindex/bitmap/BitmapFileIndexMetaV2.java
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Purpose
When the bitmap-indexed column cardinality is high, using the first version of the bitmap index format will take a lot of time to read the entire dictionary. But in fact we don't need a full dictionary when dealing with a small number of predicates, the performance of predicate hits on the bitmap can be improved by creating a secondary index on the dictionary.
https://docs.google.com/document/d/11dJlGlSX3dwYKKrPN0DQ2XQTsx6d9wI6DTBIiiBwomM/edit?tab=t.0
performance
cardinality 1000:
cardinality 10000:
cardinality 30000:
cardinality 50000:
cardinality 80000:
cardinality 100000:
Tests
org.apache.paimon.fileindex.bitmapindex.TestBitmapFileIndex
org.apache.paimon.spark.SparkFileIndexITCase
org.apache.paimon.benchmark.bitmap.BitmapIndexBenchmark
API and Format
Documentation
docs/content/concepts/spec/fileindex.md