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https://issues.apache.org/jira/browse/SPARK-18277?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16844575#comment-16844575
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Hyukjin Kwon edited comment on SPARK-18277 at 5/21/19 7:05 AM:
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Yea, please go ahead (but please add affect version too). There was a
discussion about bulk-resolving at dev mailing list (see
http://apache-spark-developers-list.1001551.n3.nabble.com/Resolving-all-JIRAs-affecting-EOL-releases-td27238.html).
was (Author: hyukjin.kwon):
Yea, please go ahead (but please add affect version too). There was a
discussion about bulk-resolving.
> na.fill() and friends should work on struct fields
> --------------------------------------------------
>
> Key: SPARK-18277
> URL: https://issues.apache.org/jira/browse/SPARK-18277
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Reporter: Nicholas Chammas
> Priority: Minor
> Labels: bulk-closed
>
> It appears that you cannot use {{fill()}} and friends to quickly modify
> struct fields.
> For example:
> {code}
> >>> df = spark.createDataFrame([Row(a=Row(b='yeah yeah'), c='alright'),
> >>> Row(a=Row(b=None), c=None)])
> >>> df.printSchema()
> root
> |-- a: struct (nullable = true)
> | |-- b: string (nullable = true)
> |-- c: string (nullable = true)
> >>> df.show()
> +-----------+-------+
> | a| c|
> +-----------+-------+
> |[yeah yeah]|alright|
> | [null]| null|
> +-----------+-------+
> >>> df.na.fill('').show()
> +-----------+-------+
> | a| c|
> +-----------+-------+
> |[yeah yeah]|alright|
> | [null]| |
> +-----------+-------+
> {code}
> {{c}} got filled in, but {{a.b}} didn't.
> I don't know if it's "appropriate", but it would be nice if {{fill()}} and
> friends worked automatically on struct fields.
> As things are today, there doesn't appear to be a way to fill in null values
> inside structs. If you try {{when()}}, you realize that you cannot do
> {{when(col('a.b') is None, '')}} because {{Column}} doesn't implement the
> appropriate protocol for {{is}}. And if you try {{when(col('a.b') == None,
> '')}} it doesn't catch the null values.
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