Yadong Qi created CARBONDATA-844:
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Summary: Avoid to get useless splits
Key: CARBONDATA-844
URL:
https://issues.apache.org/jira/browse/CARBONDATA-844 Project: CarbonData
Issue Type: Improvement
Components: core
Affects Versions: 1.1.0-incubating
Reporter: Yadong Qi
Assignee: Yadong Qi
In current implements of CarbonInputFormat.getDataBlocksOfSegment,
1. Get all of the carbondata splits in segments directory.
2. Read the carbonindex and construct the B-tree.
3. Apply filter and get matching splits.
I think we get some useless splits and the operator of getSplits is expensive. So we'd better to do the getSplits after filter:
1. List the segment directory, and filter the path of carbonindex.
2. Read the carbonindex and construct the B-tree.
3. Apply filter and get matching blocks.
4. Get carbondata splits from filtered blocks.
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