Option to import as text instead of varchar with specific size

[geraldodev]

Use case:

Imported tables cannot be inherit from common table due to difference of varchar column length.

Tip from http://www.postgresql.org/docs/9.1/static/datatype-character.html

"There is no performance difference among these three types, apart from increased storage space when using the blank-padded type, and a few extra CPU cycles to check the length when storing into a length-constrained column. While character(n) has performance advantages in some other database systems, there is no such advantage in PostgreSQL; in fact character(n) is usually the slowest of the three because of its additional storage costs. In most situations text or character varying should be used instead."