Li Jin created SPARK-24521:
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Summary: Fix ineffective test in CachedTableSuite
Key: SPARK-24521
URL: https://issues.apache.org/jira/browse/SPARK-24521
Project: Spark
Issue Type: Test
Components: SQL
Affects Versions: 2.3.1
Reporter: Li Jin
test("withColumn doesn't invalidate cached dataframe") in CachedTableSuite
doesn't not work because:
The UDF is executed and test count incremented when "df.cache()" is called and
the subsequent "df.collect()" has no effect on the test result.
link:
https://github.com/apache/spark/blob/master/sql/core/src/test/scala/org/apache/spark/sql/CachedTableSuite.scala#L86
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