Index Query Improvements

[sync-by-unito]

Queries of the form field = $0 when run on a Timestamp column (or Bool column) do not improve in performance when an index is added. We'd expect the speedup to be approximately equal to that of an integer column.

• TimestampNode and BoolNode should have special handling if an index is available.
• We should support Indexing all other column types (aside from links or collections).

[ironage]

Timestamp and Bool queries make use of an index if available since #6376 so I'm going to close this. If we want to add index support for other column types I think we should track that separately as a new project.