[DRILL-4007] json reader treats empty list inconsistently, - ASF JIRA

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Depending on where the empty list shows up, the empty list could be treated as empty-list or just a null.

Running the following query on the folder with files in the attachment can reproduce the observation:

+--------+
|   a    |
+--------+
| null   |
| ["b"]  |
| []     |
+--------+

Note that both first and third records come from

{“a”:[]}

depends upon

DRILL-3229 Create a new EmbeddedVector

is related to

DRILL-4824 Null maps / lists and non-provided state support for JSON fields. Numeric types promotion.