`com.googlecode.javaewah:JavaEWAH`

The bit array data structure is implemented in Java as the BitSet class. Unfortunately, this fails to scale without compression. JavaEWAH is a word-aligned compressed variant of the Java bitset class. It uses a 64-bit run-length encoding (RLE) compression scheme. The goal of word-aligned compression is not to achieve the best compression, but rather to improve query processing time. Hence, we try to save CPU cycles, maybe at the expense of storage. However, the EWAH scheme we implemented is always more efficient storage-wise than an uncompressed bitmap (implemented in Java as the BitSet class). Unlike some alternatives, javaewah does not rely on a patented scheme.

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1.2.3
about 3 years ago

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Registry	repo1.maven.org
Source	Repository
Docs	Documentation
JSON API	View JSON
CodeMeta	codemeta.json

Package Details

PURL	`pkg:maven/com.googlecode.javaewah/JavaEWAH` spec
License	Apache-2.0
Namespace	com.googlecode.javaewah
First Release	about 14 years ago
Last Synced	13 days ago

Keywords
bitmap-indexes bitset ewah java

Repository

Stars	551 on GitHub
Forks	147 on GitHub
Docker Dependents	2,554
Docker Downloads	1,350,045,789

repos.ecosyste.ms

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Funding

https://github.com/sponsors/lemire