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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