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

["Gopal V (JIRA)" <ji...@apache.org>]

Gopal V created HIVE-20509:
------------------------------

             Summary: Plan: fix wasted memory in plans with large partition counts
                 Key: HIVE-20509
                 URL: https://issues.apache.org/jira/browse/HIVE-20509
             Project: Hive
          Issue Type: Bug
          Components: Query Planning
            Reporter: Gopal V


{code}
  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());
  }
{code}

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



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