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https://issues.apache.org/jira/browse/SPARK-18277?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15637622#comment-15637622
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Michael Armbrust commented on SPARK-18277:
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We've been talking about better support for nested data for 2.2, [SPARK-16483].
> 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
>
> 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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