[jira] [Created] (IMPALA-13977) Switch from boost::unordered_map/unordered_set to standard library equivalents

["Joe McDonnell (Jira)" <ji...@apache.org>]

Joe McDonnell created IMPALA-13977:
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             Summary: Switch from boost::unordered_map/unordered_set to standard library equivalents
                 Key: IMPALA-13977
                 URL: https://issues.apache.org/jira/browse/IMPALA-13977
             Project: IMPALA
          Issue Type: Task
          Components: Backend
    Affects Versions: Impala 5.0.0
            Reporter: Joe McDonnell


The standard library unordered_map/unordered_set are mostly drop-in replacements for the boost versions. We can easily move most locations.

The main exceptions are:
 # In be/src/exprs/in-predicate.h, this is a performance sensitive area that was tuned in IMPALA-6621. We would need equivalent work to switch it, so maybe that isn't worth it.
 # Boost's hash function can handle more complicated key types, like vector<int> and vector<string>. There are a couple locations that need this.

 



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