Remove support for WHERE a != ?

Most NoSQL products cannot support the != operator, as this does
not provide a sufficient reduction in rows within the table space.
Remove the operator so that applications don't try to take advantage
of a feature that isn't fully portable.

Change-Id: I6aeb5fcc8e01428244d61d86c9466fbc2331cc28
Signed-off-by: Shawn O. Pearce <sop@google.com>
3 files changed