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

["Julien Le Dem (JIRA)" <ji...@apache.org>]

Julien Le Dem created DRILL-3806:
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             Summary: 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
            Assignee: Julien Le Dem


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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