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https://issues.apache.org/jira/browse/CARBONDATA-2747?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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jiangmanhua updated CARBONDATA-2747:
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Summary: Fix Lucene datamap choosing and DataMapDistributable building
(was: Lucene build wrong DataMapDistributable for all datamaps with same
DataMapSchema)
> 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
>
> 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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