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https://issues.apache.org/jira/browse/DRILL-7574?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Vova Vysotskyi updated DRILL-7574:
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Reviewer: Bohdan Kazydub
> Generalize projection parser
> ----------------------------
>
> Key: DRILL-7574
> URL: https://issues.apache.org/jira/browse/DRILL-7574
> Project: Apache Drill
> Issue Type: Improvement
> Affects Versions: 1.17.0
> Reporter: Paul Rogers
> Assignee: Paul Rogers
> Priority: Major
> Fix For: 1.18.0
>
>
> EVF contains a bit of code called the"projection parser": it takes a
> projection list and converts it into a form useful for scan projection. The
> prior version handled single-level arrays, such as needed for the
> {{`columns`}} column in the text reader. For JSON, we must handle arbitrary
> column structures such as:
> {noformat}
> a, a.b, a[1], a[1][2], a.[1][2].b
> {noformat}
> Adding the DICT type means that we must be a bit more general in the parser.
> This ticket fixes these issues.
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