mirror of https://github.com/apache/druid.git
500681d0cb
* Add ImmutableLookupMap for static lookups. This patch adds a new ImmutableLookupMap, which comes with an ImmutableLookupExtractor. It uses a fastutil open hashmap plus two lists to store its data in such a way that forward and reverse lookups can both be done quickly. I also observed footprint to be somewhat smaller than Java HashMap + MapLookupExtractor for a 1 million row lookup. The main advantage, though, is that reverse lookups can be done much more quickly than MapLookupExtractor (which iterates the entire map for each call to unapplyAll). This speeds up the recently added ReverseLookupRule (#15626) during SQL planning with very large lookups. * Use in one more test. * Fix benchmark. * Object2ObjectOpenHashMap * Fixes, and LookupExtractor interface update to have asMap. * Remove commented-out code. * Fix style. * Fix import order. * Add fastutil. * Avoid storing Map entries. |
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