[jira] [Created] (SPARK-16928) Recursive call of ColumnVector::getInt() breaks JIT inlining

["Qifan Pu (JIRA)" <ji...@apache.org>]

Qifan Pu created SPARK-16928:
--------------------------------

             Summary: Recursive call of ColumnVector::getInt() breaks JIT inlining
                 Key: SPARK-16928
                 URL: https://issues.apache.org/jira/browse/SPARK-16928
             Project: Spark
          Issue Type: Improvement
    Affects Versions: 2.0.0
            Reporter: Qifan Pu


In both OnHeapColumnVector and OffHeapColumnVector, we implemented getInt() with the following code pattern: 

  public int getInt(int rowId) {
    if (dictionary == null) {
      return intData[rowId];
    } else {
      return dictionary.decodeToInt(dictionaryIds.getInt(rowId));
    }
  }

As dictionaryIds is also a ColumnVector, this results in a recursive call of getInt() and breaks JIT inlining. As a result, getInt() will not get inlined.




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