[HIVE-20509] Plan: fix wasted memory in plans with large partition counts

• Type: Bug
• Status: Closed
• Priority: Minor
• Resolution: Fixed
• Fix Version/s: 4.0.0-alpha-1
• Component/s: Query Planning
• Labels: newbie
• Assignee: Barnabas Maidics
• Reporter: Gopal Vijayaraghavan
• Created: 06/Sep/18 00:12
• Updated: 17/Nov/22 08:55
• Resolved: 16/Oct/18 08:23

Description

  public void addPathToAlias(Path path, String newAlias){
    ArrayList<String> aliases = pathToAliases.get(path);
    if (aliases == null) {
      aliases = new ArrayList<>();
      StringInternUtils.internUriStringsInPath(path);
      pathToAliases.put(path, aliases);
    }
    aliases.add(newAlias.intern());
  }

ArrayList::DEFAULT_CAPACITY is 10, so this wastes 500 bytes of memory due to the new ArrayList<>();.