Github user maropu commented on a diff in the pull request:
https://github.com/apache/spark/pull/21803#discussion_r203584039
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/types/StructType.scala ---
@@ -436,6 +436,14 @@ object StructType extends AbstractDataType {
*/
def fromDDL(ddl: String): StructType =
CatalystSqlParser.parseTableSchema(ddl)
+ /**
+ * Converts a value of StructType to a string in DDL format. For example:
+ * `StructType(Seq(StructField("a", IntegerType)))` should be converted
to `a int`
+ */
+ def toDDL(struct: StructType): String = {
+ struct.map(field => s"${quoteIdentifier(field.name)}
${field.dataType.sql}").mkString(",")
--- End diff --
Can this also handle the special character ('\n', '\t', '\', ...) that
needs an escape?
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