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https://issues.apache.org/jira/browse/SPARK-16157?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15345275#comment-15345275
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Apache Spark commented on SPARK-16157:
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User 'gatorsmile' has created a pull request for this issue:
https://github.com/apache/spark/pull/13860
> Add New Methods for Comments in StructField and StructType
> ----------------------------------------------------------
>
> Key: SPARK-16157
> URL: https://issues.apache.org/jira/browse/SPARK-16157
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 2.0.0
> Reporter: Xiao Li
>
> Currently, the column-related comment attribute is stored in {{Metadata}}.
> For example,
> {noformat}
> StructType(
> StructField("cl1", IntegerType, nullable = false,
> new MetadataBuilder().putString("comment", "test").build()) :: Nil)
> {noformat}
> Compared with the existing SQL interface, it is not user friendly to add such
> a comment attribute when defining a {{StructField}}.
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