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https://issues.apache.org/jira/browse/CARBONDATA-2747?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
xuchuanyin resolved CARBONDATA-2747.
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Resolution: Fixed
Fix Version/s: 1.4.1
> Fix Lucene datamap choosing and DataMapDistributable building
> --------------------------------------------------------------
>
> Key: CARBONDATA-2747
> URL:
https://issues.apache.org/jira/browse/CARBONDATA-2747> Project: CarbonData
> Issue Type: Bug
> Reporter: jiangmanhua
> Priority: Major
> Fix For: 1.4.1
>
> Time Spent: 1h 20m
> Remaining Estimate: 0h
>
> similar problem in bloom datamap is in issue CARBONDATA-2746; but test result is wrong if we apply same fix
>
> Analysis:
> In `DataMapChooser#extractColumnExpression`, it does not deal with `MatchExpression`. This makes no information to use the column name to filter datamap.
>
> In `DataMapChooser#contains`, all datamap are marked as useful if lucene datamap is hit ( `ExpressionType.TEXT_MATCH`). Then the first datamap is chosen after sort step(sort by number of index column) .
>
> In `LuceneDataMapFactoryBase#toDistributable`, carbon getAllIndexDirs and build DataMapDistributable for each index in same segment. This means that one segment will be applied `prune` by different index datamap(lucene use `indexPath` in `LuceneDataMapDistributable` to init its datamap object and build the `indexSearcherMap`)
>
> In out test case, we build datamaps on columns:name and city, one for each.
> Query uses column `name` as filter. Unfortunately, in the `DataMapChooser`, it chooses datamap of city column.
> Then in `toDistributable` method, it gets all datamaps and build `LuceneDataMapDistributable`. Here in out test, it will prune and get result from each datamap.
> On datamap of city, query "name:c10" in lucene return no row. On datamap of name, query "name:c10" in lucene return actual what we want.
>
> So, if we apply same fix in CARBONDATA-2746 for lucene, we will get only one datamap ( which is for city column) and prune result will be nothing.
>
> To Fix:
> # choose correct datamap in DataMapChooser for lucene
> # apply same fix in CARBONDATA-2746 to build correct `LuceneDataMapDistributable`
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