Github user VikingK commented on the issue:
https://github.com/apache/nifi/pull/3057
@mattyb149 I checked out the new backtick ddl patch you applied. Its seems
it only backticks the complex data structures, the "top" level ones are for
example not ticked.
For example ProductId,Items,PropertyMap,Serial and Metadata should be
backticked as well to protect from bad names.
```
hive.ddl
CREATE EXTERNAL TABLE IF NOT EXISTS Sales (ProductId INT, Items
ARRAY<STRUCT<`DNumber`:INT, `NSales`:BIGINT>>, PropertyMap MAP<STRING, STRING>,
Serial STRUCT<`Serial`:BIGINT, `Date`:TIMESTAMP, `SystemId`:BIGINT, `T`:BIGINT,
`IncludeStartTx`:BOOLEAN>, Metadata STRUCT<`AvroTs`:TIMESTAMP>) STORED AS ORC
```
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