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https://issues.apache.org/jira/browse/ASTERIXDB-3332?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Wail Y. Alkowaileet resolved ASTERIXDB-3332.
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Resolution: Fixed
> Consolidate projected fields and filters when scanning the same dataset
> -----------------------------------------------------------------------
>
> Key: ASTERIXDB-3332
> URL: https://issues.apache.org/jira/browse/ASTERIXDB-3332
> Project: Apache AsterixDB
> Issue Type: Bug
> Components: COMP - Compiler
> Affects Versions: 0.9.9
> Reporter: Wail Y. Alkowaileet
> Assignee: Wail Y. Alkowaileet
> Priority: Major
> Labels: triaged
> Fix For: 0.9.9
>
>
> When a dataset is scanned (or searched) more than once, we replicate the
> output of such operators and the dataset will be accessed once.
> In columnar datasets, different scans (and searches) can project different
> fields or can have different filters. In such case, we scan (or search) the
> same dataset more than once (due to the different projection and filtration).
> This may induce several issues. For example, if there's a continuous
> ingestion, the two data-scans could produce different tuples.
> To mitigate this issue, projected fields of different scans should be
> consolidated and the filter expressions of the same scans should be
> normalized and consolidated as a single disjunct expression.
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