* `=` conditions while the final key uses a `>` condition
*
* Example output:
- * array( '( foo = 42 AND bar > 7 ) OR ( foo > 42 )' )
+ * [ '( foo = 42 AND bar > 7 ) OR ( foo > 42 )' ]
*
* @return array The SQL conditions necessary to select the next set
* of rows in the batched query