[HIVE-8284] Equality comparison is done between two floating point variables in HiveRelMdUniqueKeys#getUniqueKeys()

• Type: Bug
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 0.14.0
• Fix Version/s: 1.1.0
• Component/s: CBO
• Assignee: JongWon Park
• Reporter: Ted Yu
• Created: 27/Sep/14 16:28
• Updated: 12/Feb/15 23:41
• Resolved: 13/Nov/14 06:12

Description

    double numRows = tScan.getRows();
...
        double r = cStat.getRange().maxValue.doubleValue() -
            cStat.getRange().minValue.doubleValue() + 1;
        isKey = (numRows == r);

The equality check should use a small epsilon as tolerance.