Minor Description
Need to add new methods which should convert a value of StructType to a schema in DDL format . It should be possible to use the former string in new table creation by just copy-pasting of new method results. The existing methods simpleString(), catalogString() and sql() put ':' between top level field name and its type, and wrap by the struct word
ds.schema.catalogString struct<metaData:struct<eventId:string ...
Output of new method should be
metaData struct<eventId:string ...
