[CALCITE-969] Composite EnumerableSort with DESC wrongly sorts NULL values low

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 1.6.0
• Assignee: Julian Hyde
• Reporter: liyang
• Created: 16/Nov/15 02:47
• Updated: 21/Jan/16 22:20
• Resolved: 17/Nov/15 19:34

Description

NULL first or NULL last is not clearly defined by sql spec, but should be consistent in calcite.

I spot order by (A desc) returns NULL last, but order by (A desc, B) returns NULL first.

E.g. "select cal_dt, country, ... from xxx order by COUNTRY DESC" returns

2013-08-11 US ....
2013-08-18 FR ....
2013-03-31 null ....
2013-11-10 null ....

E.g. "select cal_dt, country, ... from xxx order by COUNTRY DESC, CAL_DT ASC" returns

2013-03-31 null ....
2013-11-10 null ....
2013-08-11 US ....
2013-08-18 FR ....