This patch fixes a few row key issues:
1. We used to assert that the row key filter must be a string literal.
However, it can also be a constant function. We need to eval the expr
and then use the result as the start/stop key.
2. Cast(row_key as int) simply failed.
This should not be transformed into start/stop key.
3. We used to assert that lower bound < upper bound.
This query:
select * from tbl where row_key > 'b' and row_key < 'a'
would simply ASSERT. We should simply not return any rows.
4. Handle NULL predicate
HBase row key can't be null. If either upper/lower bound is null, we simply
don't need to return any rows.
Change-Id: Ia03590a862888b377bf1f48bcb838b99193fa241
Reviewed-on: http://gerrit.ent.cloudera.com:8080/1180
Reviewed-by: Alan Choi <alan@cloudera.com>
Tested-by: jenkins
57b961168d