Prasanth Jayachandran created HIVE-14354:
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Summary: Cleanup ORC reader interfaces and redundant metadata
objects
Key: HIVE-14354
URL: https://issues.apache.org/jira/browse/HIVE-14354
Project: Hive
Issue Type: Bug
Components: ORC
Affects Versions: 2.2.0
Reporter: Prasanth Jayachandran
Assignee: Prasanth Jayachandran
ORC reader interface has to separated out to a new interface that only returns
metadata.
OrcTail should implement the new interface that only provides metadata
information about the file.
OrcFileMetadata object contains many redundant information that can be obtained
from OrcTail. This class should be cleaned up and OrcTail should be reused.
Remove all references to List<OrcProto.Types> and replace them with
TypeDescription.
SchemaEvolution objects are created in multiple places. But the information
required for creating SchemaEvolution is already present within the Reader
(file types, projection and schema on read).
Schema on read can be specified only to RecordReader options. Reader options
should also accept schema on read type description.
Consolidate Reader options and RecordReader options.
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