sumitsu opened a new pull request #23674: [SPARK-26745][SQL] JsonSuite test case: empty line -> 0 record count URL: https://github.com/apache/spark/pull/23674 ## What changes were proposed in this pull request? This PR consists of the `test` components of #23665 only, minus the associated patch from that PR. It adds a new unit test to `JsonSuite` which verifies that the `count()` returned from a `DataFrame` loaded from JSON containing empty lines does not include those empty lines in the record count. The test runs `count` prior to otherwise reading data from the `DataFrame`, so as to catch future cases where a pre-parsing optimization might result in `count` results inconsistent with existing behavior. This PR is intended to be deployed alongside #23667; `master` currently causes the test to fail, as described in [SPARK-26745](https://issues.apache.org/jira/browse/SPARK-26745). ## How was this patch tested? Manual testing, existing `JsonSuite` unit tests.
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