[jira] [Created] (HIVE-9605) Remove parquet nested objects from wrapper writable objects

["Sergio Peña (JIRA)" <ji...@apache.org>]

Sergio Peña created HIVE-9605:
---------------------------------

             Summary: Remove parquet nested objects from wrapper writable objects
                 Key: HIVE-9605
                 URL: https://issues.apache.org/jira/browse/HIVE-9605
             Project: Hive
          Issue Type: Sub-task
    Affects Versions: 0.14.0
            Reporter: Sergio Peña
            Assignee: Sergio Peña


Parquet nested types are using an extra wrapper object (ArrayWritable) as a wrapper of map and list elements. This extra object is not needed and causing unnecessary memory allocations.

An example of code is on HiveCollectionConverter.java:

{noformat}
public void end() {
    parent.set(index, wrapList(new ArrayWritable(
        Writable.class, list.toArray(new Writable[list.size()]))));
}
{noformat}

This object is later unwrapped on AbstractParquetMapInspector, i.e.:
{noformat}
final Writable[] mapContainer = ((ArrayWritable) data).get();
final Writable[] mapArray = ((ArrayWritable) mapContainer[0]).get();
for (final Writable obj : mapArray) {
  ...
}
{noformat}

We should get rid of this wrapper object to save time and memory.



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