[jira] [Reopened] (CARBONDATA-844) Avoid to get useless splits

[Akash R Nilugal (Jira)]

     [ https://issues.apache.org/jira/browse/CARBONDATA-844?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Yadong Qi reopened CARBONDATA-844:
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> 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
>            Reporter: Yadong Qi
>            Assignee: Yadong Qi
>             Fix For: 1.1.0
>
>          Time Spent: 20m
>  Remaining Estimate: 0h
>
> 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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