[SERVER-4327] allow dummy table scans in no table scan mode - MongoDB Jira

XML

Word

Printable

JSON

Implement what I described here:

        if ( _impossible ) {

            // TODO We might want to allow this dummy table scan even in no table

            // scan mode, since it won't scan anything.

            if ( _frs.nNontrivialRanges() )

                checkTableScanAllowed( _frs.ns() );

            return shared_ptr<Cursor>( new BasicCursor( DiskLoc() ) );

Also audit additional notablescan functionality (see SERVER-2222).

is related to

SERVER-2222 notablescan mode neglects to fail some table scan queries

related to

SERVER-4317 index not used when argument to $in is empty array