Hybrid columnar automatic format - response (2) by ToddAWalter

Teradata does not automatically determine if a table should be row format or column format. That needs to be specified by the DBA at physical table definition time. The examples you provide show a couple of the options, the second is the most simple version making every column column storage. The first is a more complex example which shows a mix of column store and row store in the same table. 
What Teradata does do automatically is to determine what compression algorithms to apply to the data in column stored columns (unless you tell it not to with No Auto Compression).