Update Refine DataFrame converter

Authored by JAllemandou on Mar 13 2018, 4:11 PM.

Description

Update Refine DataFrame converter

First version was using Rows and didn't allow for data
casting.
Now we generate a SQL transformation, using SQL cast
function when types differ.

Change-Id: I94393926a93bfb7e0adc31366606dfcda3322f99