Fix flush() for RecordConsumer and implementations

[asfimport]

+flush()+ was added in +RecordConsumer+ and +MessageColumnIO+ to help implementing nulls caching.

However, other +RecordConsumer+ implementations should also implements +flush()+ properly. For instance, +RecordConsumerLoggingWrapper+ and +ValidatingRecordConsumer+ should call +delegate.flush()+ in their +flush()+ methods, otherwise data might be mistakenly truncated.

This ticket:

• makes +flush()+ abstract in +RecordConsumer+
• implements +flush()+ properly for all +RecordConsumer+ subclasses, specifically:
  • +RecordConsumerLoggingWrapper+
  • +ValidatingRecordConsumer+
  • +ConverterConsumer+
  • +ExpectationValidatingRecordConsumer+

Reporter: Liwei Lin(Inactive) / @lw-lin
Assignee: Liwei Lin(Inactive) / @lw-lin

Related issues:

• Deprecate Log and move to SLF4J Logger (blocks)

PRs and other links:

• PR#325

_{Note: This issue was originally created as PARQUET-528. Please see the migration documentation for further details.}

[asfimport]

Cheng Lian / @liancheng:
Issue resolved by pull request 325
#325