[jira] [Created] (CASSANDRA-11423) Eliminate Pair allocations for default DataType conversions

["Nitsan Wakart (JIRA)" <ji...@apache.org>]

Nitsan Wakart created CASSANDRA-11423:
-----------------------------------------

             Summary: Eliminate Pair allocations for default DataType conversions
                 Key: CASSANDRA-11423
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-11423
             Project: Cassandra
          Issue Type: Improvement
          Components: Core
            Reporter: Nitsan Wakart


The method DataType::fromType returns a Pair. The common path through the method is:
{
   DataType dt = dataTypeMap.get(type);
   return new Pair(dt, null);
}
This results in many redundant allocation and is easy to fix by adding a DataType field to cache this result per DataType and replacing the last line with:
  return dt.pair;

see fix:
https://github.com/nitsanw/cassandra/tree/data-type-dafault-pair



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