fix can_apply method for hzip filter

Nobody has claimed this yet.

Presently, the can_apply method for the hzip filter is always saying 'yes' and the real logic to determine if there is a problem is handled either in the actual filter op or in the various DBPrepare... methods that decide whether to have the filter turned on or not.

-----------------------REDMINE MIGRATION-----------------------
This ticket was migrated from Redmine. As such, not all
information was able to be captured in the transition. Below is
a complete record of the original redmine ticket.

Ticket number: 1187
Status: New
Project: VisIt
Tracker: Bug
Priority: Normal
Subject: fix can_apply method for hzip filter
Assigned to: -
Category: -
Target version: -
Author: Mark Miller
Start: 08/30/2012
Due date:
% Done: 0%
Estimated time:
Created: 08/30/2012 08:48 pm
Updated:
Likelihood: 3 - Occasional
Severity: 2 - Minor Irritation
Found in version: 4.8
Impact:
Expected Use:
OS: All
Support Group: Any
Description:
Presently, the can_apply method for the hzip filter is always saying 'yes' and the real logic to determine if there is a problem is handled either in the actual filter op or in the various DBPrepare... methods that decide whether to have the filter turned on or not.

Comments:

Start by locating the hzip filter's can_apply method, then compare it with the filter operation and the DBPrepare... methods mentioned in the issue. Determine the conditions that indicate the filter cannot be applied; the work is done when can_apply reports those conditions consistently instead of always returning yes.

Written by the indexing model from the issue text.