Sergio Peña created HIVE-9692:
---------------------------------
Summary: Allocate only parquet selected columns in
HiveStructConverter class
Key: HIVE-9692
URL: https://issues.apache.org/jira/browse/HIVE-9692
Project: Hive
Issue Type: Sub-task
Reporter: Sergio Peña
Assignee: Sergio Peña
HiveStructConverter class is where Hive converts parquet objects to hive
writable objects that will be later parsed by object inspectors. This class is
allocating enough writable objects as number of columns of the file schema.
{noformat}
ublic HiveStructConverter(final GroupType requestedSchema, final GroupType
tableSchema, Map<String, String> metadata) {
...
this.writables = new Writable[fileSchema.getFieldCount()];
...
}
{noformat}
This is always allocated even if we only select a specific number of columns.
Let's say 2 columns from a table of 50 columns. 50 objects are allocated. Only
2 are used, and 48 are unused.
We should be able to allocate only the requested number of columns in order to
save memory usage.
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