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https://issues.apache.org/jira/browse/SPARK-29238?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16939379#comment-16939379
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Hyukjin Kwon commented on SPARK-29238:
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Since there's no record, there would be anything will be added as a value.
There's 0 records so no record that holds the literal.
> Add newColumn using withColumn to an empty Dataframe
> ----------------------------------------------------
>
> Key: SPARK-29238
> URL: https://issues.apache.org/jira/browse/SPARK-29238
> Project: Spark
> Issue Type: Question
> Components: SQL
> Affects Versions: 2.3.2
> Reporter: ARUN KINDRA
> Priority: Major
>
> Hi
> I'm trying to add a newColumn to an empty DF but I don't see the new column
> is getting added.
> Dataset<Row> newDF = sparkSession.emptyDataFrame();
> Dataset<Row> newDf_DateConverted = newDF.withColumn("year", lit("2019"));
> newDf_DateConverted.show();
> *Output:*
> +-------------------+
> |year|
> +-------------------+
> +-------------------+
>
> Basically, I am reading a HBase table and if there is no data into the table
> i get empty JavaPairRDD. I convert that JavaPairRDD to JavaRDD<Row> and then
> using schema I convert into a DF. Later I need to insert that DF values into
> the Hive external partitioned table. But when there is no data in HBase i am
> not seeing the partition getting created in HDFS.
> So, I tried the above 2 lines to code where I have empty DF and I try to add
> partitioned column into it, that also doesn't work.
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