[jira] [Commented] (DRILL-3806) add metadata for untyped null and simple type promotion

["Joris Gillis (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/DRILL-3806?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15266171#comment-15266171 ] 

Joris Gillis commented on DRILL-3806:
-------------------------------------

I am experiencing the same issue. Any progress in the meantime?

> add metadata for untyped null and simple type promotion
> -------------------------------------------------------
>
>                 Key: DRILL-3806
>                 URL: https://issues.apache.org/jira/browse/DRILL-3806
>             Project: Apache Drill
>          Issue Type: Bug
>          Components: Execution - Data Types
>            Reporter: Julien Le Dem
>             Fix For: Future
>
>
> Currently when a field has literal null values in JSON the type will be assigned as BIGINT by default for lack of better type.
> ```
> {
>   "a": null
> }
> ```
> if later on a is assigned with a string value the query will fail with a schema change error,
> The idea is to capture the notion of "untyped null" and implement simple type promotion from untyped null to the actual type.



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