Postgres kann Indizes mit Bloom-Filter.

Use-Case:

In the case of an index access method, it allows fast exclusion of non-matching tuples via signatures whose size is determined at index creation.
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This type of index is most useful when a table has many attributes and queries test arbitrary combinations of them. A traditional btree index is faster than a bloom index, but it can require many btree indexes to support all possible queries where one needs only a single bloom index. Note however that bloom indexes only support equality queries, whereas btree indexes can also perform inequality and range searches.