[GitHub] [flink] azagrebin commented on pull request #6735: [FLINK-9126] New CassandraPojoInputFormat to output data as a custom annotated Cassandra Pojo

[GitHub]

I think we can use `checkNotNull`:
```
Preconditions.checkNotNull(builder, "Builder cannot be null");
```
for readability

[ Full content available at: https://github.com/apache/flink/pull/6735 ]
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