[IGNITE-2751] GridH2TreeIndex.getRowCount unwraps objects' values that are not used later

• Type: Bug
• Status: Closed
• Priority: Critical
• Resolution: Fixed
• Affects Version/s: 1.5.0.final
• Fix Version/s: 1.6
• Labels: community important
• Assignee: Alexey Scherbakov
• Reporter: Denis A. Magda
• Created: 03/Mar/16 05:48
• Updated: 18/May/16 03:52
• Resolved: 17/May/16 04:16

Description

If to run query like "SELECT COUNT FROM table" then our implementation will perform a full scan filtering out entries that are not primary for a given node and will calculate only a number of primary ones.

If entries are stored off-heap then both a key and value of an entry are unswapped, Unswapped values are not used by backup filters thus we have to omit unswapping of the values at all.