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

["Paul Rogers (Jira)" <ji...@apache.org>]

Paul Rogers created DRILL-7574:
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             Summary: 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
             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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