[HIVE-18005] Improve size estimation for array() to be not 0

• Type: Sub-task
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 3.0.0
• Component/s: Statistics
• Assignee: Zoltan Haindrich
• Reporter: Zoltan Haindrich
• Created: 07/Nov/17 21:16
• Updated: 22/May/18 23:13
• Resolved: 05/Dec/17 09:59

Description

happens only in case the array is not from a column; and the array contains no column references

EXPLAIN
SELECT sort_array(array("b", "d", "c", "a")),array("1","2") FROM t

...
             Statistics: Num rows: 1 Data size: 0 Basic stats: COMPLETE Column stats: COMPLETE
             ListSink