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https://issues.apache.org/jira/browse/DRILL-3806?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15249665#comment-15249665
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Vitalii Diravka commented on DRILL-3806:
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I saw the same problem with json and parquet files.
Here is the example for reproducing
[-DRILL-4614-|https://issues.apache.org/jira/browse/DRILL-4614]
> 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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