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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