Introduce a mapping to map sparse labels to a continuous range #14494
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moved this to Open
in OpenSearch Lucene & Core Performance Tracking
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Whoa, exciting! I will try to review soon! Thanks @gf2121. |
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In ASCII encoding, numbers, lowercase letters, uppercase letters, and punctuation have discontinuous value ranges. This PR proposes to use a mapping to map the discontinuous value ranges to a continuous value range starting from 0. This can save some storage space and increase the probability of using the
BITSETstrategy instead of theARRAYstrategy, which may also improve some performance.In luceneutil, this patch reduces ~1.5% size of tip, including ~5% for the
idfield, which encoded with base36 (numbers and lowercase letters). Performance is generally even.