2 spaces were used instead of 4 in some places
Fixes #420 Keep table schema of overviews base tables and use it to support queries that use the schema name when not strictly needed.
Use the Windshaft query-rewriter interface to adapt queries so they use available overview tables. This requires a version of Windshaft that implements the query-rewriter interface (package.json/npm-shrinkwap.json have yet to be updated)
