Flexible Tables
Vertica database tables that minimally contain two columns:
__identity__
– A real column with an incrementing IDENTITY value for partitioning and sorting purposes, if no other columns serve this purpose.
__raw__
– A real LONG VARBINARY
column containing unstructured, or semi-structured data.
You can create Flex tables with additional real columns, but they are not required. Compare with Columnar Tables.