[GitHub] [pinot] richardstartin commented on pull request #8818: regexp_like fusing

[GitBox <gi...@apache.org>]

richardstartin commented on PR #8818:
URL: https://github.com/apache/pinot/pull/8818#issuecomment-1145814759

   I don’t believe the native FST supports backreferences, and I don’t think it would be easy to add support either. Not sure about the lucene FST index. As mentioned above, LIKE statements (e.g. LIKE ‘%foo%’) can’t express all regular expression features, which should reduce the scope of the edge cases to be considered.
   
   This definitely needs benchmarking for at least the following scenarios;
   * Single like statement
   * N like statements combined with OR
   
   for each of:
   * no FST index - both raw and dictionarized
   * Lucene FST index
   * Native FST index


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