MaxGekk opened a new pull request #28639:
URL: https://github.com/apache/spark/pull/28639


   ### What changes were proposed in this pull request?
   Modified formatting of expected timestamp strings in the test 
`JavaBeanDeserializationSuite`.`testSpark22000` to correctly format timestamps 
with **zero** seconds fraction. Current implementation outputs `.0` but must be 
empty string. From SPARK-31820 failure:
   - should be `2020-05-25 12:39:17`
   - but incorrect expected string is `2020-05-25 12:39:17.0`
   
   ### Why are the changes needed?
   To make `JavaBeanDeserializationSuite` stable, and avoid test failures like 
https://github.com/apache/spark/pull/28630#issuecomment-633695723
   
   ### Does this PR introduce _any_ user-facing change?
   No
   
   ### How was this patch tested?
   I changed 
https://github.com/apache/spark/blob/7dff3b125de23a4d6ce834217ee08973b259414c/sql/core/src/test/java/test/org/apache/spark/sql/JavaBeanDeserializationSuite.java#L207
 to
   ```java
   new java.sql.Timestamp((System.currentTimeMillis() / 1000) * 1000),
   ```
   to force zero seconds fraction.


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