Support for Common table expressions

[belgattitude]

Any thoughts about supporting CTE (common table expressions) ?

In mariadb 10.2:
https://mariadb.com/kb/en/mariadb/non-recursive-common-table-expressions-overview/

Or postgresql:
https://www.postgresql.org/docs/9.1/static/queries-with.html

Would be a nice addition and I might work on this if a bit guided.

Thanks

[michalbundyra]

This repository has been closed and moved to laminas/laminas-db; a new issue has been opened at laminas/laminas-db#71.