[jira] [Updated] (DRILL-7574) Generalize projection parser

["Vova Vysotskyi (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/DRILL-7574?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Vova Vysotskyi updated DRILL-7574:
----------------------------------
    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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