[HIVE-9443] ORC PPD - fix fuzzy case evaluation of IS_NULL

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 0.15.0
• Fix Version/s: 1.1.0
• Component/s: File Formats
• Release Note: Fix ORC IS_NULL predicate for columns with some nulls
• Assignee: Gopal Vijayaraghavan
• Reporter: Gopal Vijayaraghavan
• Created: 22/Jan/15 08:21
• Updated: 12/Feb/15 23:40
• Resolved: 25/Jan/15 05:04

Description

CLEAR LIBRARY CACHE

ORC PPD returns IS_NULL wrong for the fuzz case of some-nulls.

The code-flow in effect should be

if (min == null) {
  // all nulls
  return YES;
} else {
  if (hasNull == true) {
     // some nulls
     return YES_NO; //maybe
  }
  // no nulls
  return NO;
}

Issue Links

• is related to: HIVE-4639 Add has null flag to ORC internal index