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https://issues.apache.org/jira/browse/TAJO-838?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14239129#comment-14239129
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ASF GitHub Bot commented on TAJO-838:
-------------------------------------
Github user jinossy commented on the pull request:
https://github.com/apache/tajo/pull/231#issuecomment-66248878
@jihoonson
This patch needs to be rebased against the latest revision. and Could you
take care of this error ?
```
[ERROR]
/home/travis/build/apache/tajo/tajo-catalog/tajo-catalog-drivers/tajo-hcatalog/src/main/java/org/apache/tajo/catalog/store/HCatalogStore.java:[59,7]
org.apache.tajo.catalog.store.HCatalogStore is not abstract and does not
override abstract method existIndexesByTable(java.lang.String,java.lang.String)
in org.apache.tajo.catalog.store.CatalogStore
[ERROR]
/home/travis/build/apache/tajo/tajo-catalog/tajo-catalog-drivers/tajo-hcatalog/src/main/java/org/apache/tajo/catalog/store/HCatalogStore.java:[793,2]
method does not override or implement a method from a supertype
```
> Improve query planner to utilize index
> --------------------------------------
>
> Key: TAJO-838
> URL: https://issues.apache.org/jira/browse/TAJO-838
> Project: Tajo
> Issue Type: Sub-task
> Components: planner/optimizer
> Reporter: Jihoon Son
> Assignee: Jihoon Son
> Priority: Minor
>
> Index can improve the query performance when the selectivity of query is high.
> Thus, query planner should decide whether index is used or not for a given
> query.
> The selectivity can be guessed using statistics.
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