MultiEngineQuery Collapses Non-Pk Fact Table Dimension Rows

[ryankwagner]

This issue is illustrated here:
#447

It is most noticeable when the column is Mapped (# Type, for example), which makes query behavior inconsistent with the Reporting Request.

Given a Dimension located in the fact with multiple expected useful output values, this dimension gets collapsed as it is not the most granular key alias on the table.

[patelh]

Is this for a dim driven query or fact driven?