Yurui Zhou created ORC-469:
------------------------------
Summary: Add EncodedStringVectorBatch to expose string dictionary
in VectorBatch
Key: ORC-469
URL: https://issues.apache.org/jira/browse/ORC-469
Project: ORC
Issue Type: Improvement
Components: Reader
Affects Versions: 1.5.5, 1.6.0, 2.0.0
Reporter: Yurui Zhou
Propose to add EncodedStringVectorBatch to expose string dictionary in
VectorBatch. Exposing string dictionary will benefits as bellow:
* Enable computation over encoded data. By exposing dictionary in vector batch
we would be able to implement filter operator in a more efficient way. In our
POC, by enabling encoded data based filter, we achieved 8% E2E perf improvement.
* Make data serialization more efficient. Currently when serializing Orc
Vectorbatch, we have to copy all the strings in a vector even though the string
data is already dictionary encoded. Exposing String Dictionary will enable
vector batch serializer to remove unnecessary string memcpy, which will greatly
improve serialization efficiency.
--
This message was sent by Atlassian JIRA
(v7.6.3#76005)
