Github user yhuai commented on a diff in the pull request: https://github.com/apache/spark/pull/3999#discussion_r22803087 --- Diff: sql/core/src/main/scala/org/apache/spark/sql/sources/ddl.scala --- @@ -120,8 +122,10 @@ private[sql] class DDLParser extends StandardTokenParsers with PackratParsers wi protected lazy val pair: Parser[(String, String)] = ident ~ stringLit ^^ { case k ~ v => (k,v) } protected lazy val column: Parser[StructField] = - ident ~ dataType ^^ { case columnName ~ typ => - StructField(columnName, typ) + ident ~ dataType ~ (COMMENT ~> stringLit).? ^^ { case columnName ~ typ ~ cm => + val metadata = new MetadataBuilder() + .putString(COMMENT.str.toLowerCase(), cm.getOrElse("")).build() + StructField(columnName, typ, true, metadata) --- End diff -- I think the test failure will be resolved once we do not create a `metadata` if there is no comment.
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