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https://issues.apache.org/jira/browse/SPARK-27408?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Hyukjin Kwon resolved SPARK-27408.
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Resolution: Invalid
Sounds like the issue is specific to mongo-spark
> functions.coalesce working on csv but not on Mongospark
> -------------------------------------------------------
>
> Key: SPARK-27408
> URL: https://issues.apache.org/jira/browse/SPARK-27408
> Project: Spark
> Issue Type: Bug
> Components: Java API
> Affects Versions: 2.2.0
> Reporter: yashwanth
> Priority: Minor
>
> e1.csv
>
> id,code,type
> 1,,A
> 2,,
> 3,123,I
>
> e2.csv
> id,code,type
> 1,456,A
> 2,789,A1
> 3,,C
> Dataset<Row> goldenCopy = e1.as("a").join(e2.as("b")).where("a.id == b.id");
>
> goldenCopy.select(functions.coalesce(e1.col("code"),e2.col("code"))).show();
> I can't able to run the above code on dataset got from mongo-spark, I had
> imported same csv files into mongodb using mongoimport .
>
> refer stackoverflow
> https://stackoverflow.com/questions/55570984/spark-functions-coalesce-not-working-on-mongodb-collections-but-works-on-csvs
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