Diff all tables between two database revisions

[fulghum]

Dolt provides several features to diff table data at different points in the database's revision tree. All of these currently operate on a single table; if customers want to diff all tables across the complete database, they have to manually iterate across all tables and make multiple queries to assemble the results. Providing a way to do this in a single query would improve this use case.

[timsehn]

Proposed interface:

dolt_diffall

Has all the union of all from and to columns in every table scoped by tablename. (ie <from_tablename_column>, <to_tablename_column>)