{"action":"created","comment":{"url":"https://api.github.com/repos/druid-io/druid/pulls/comments/62966358","id":62966358,"diff_hunk":"@@ -0,0 +1,143 @@\n+/*\n+ * Licensed to Metamarkets Group Inc. (Metamarkets) under one\n+ * or more contributor license agreements. See the NOTICE file\n+ * distributed with this work for additional information\n+ * regarding copyright ownership. Metamarkets licenses this file\n+ * to you under the Apache License, Version 2.0 (the\n+ * \"License\"); you may not use this file except in compliance\n+ * with the License. You may obtain a copy of the License at\n+ *\n+ * http://www.apache.org/licenses/LICENSE-2.0\n+ *\n+ * Unless required by applicable law or agreed to in writing,\n+ * software distributed under the License is distributed on an\n+ * \"AS IS\" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY\n+ * KIND, either express or implied. See the License for the\n+ * specific language governing permissions and limitations\n+ * under the License.\n+ */\n+\n+package io.druid.query.aggregation.variance;\n+\n+import io.druid.query.aggregation.Aggregator;\n+import io.druid.segment.FloatColumnSelector;\n+import io.druid.segment.LongColumnSelector;\n+import io.druid.segment.ObjectColumnSelector;\n+\n+/**\n+ */\n+public abstract class VarianceAggregator implements Aggregator\n+{\n+  protected final String name;\n+\n+  protected final VarianceHolder holder = new VarianceHolder();\n+\n+  public VarianceAggregator(String name)\n+  {\n+    this.name = name;\n+  }\n+\n+  @Override\n+  public void reset()\n+  {\n+    holder.reset();\n+  }\n+\n+  @Override\n+  public Object get()\n+  {\n+    return holder;\n+  }\n+\n+  @Override\n+  public String getName()\n+  {\n+    return name;\n+  }\n+\n+  @Override\n+  public void close()\n+  {\n+  }\n+\n+  @Override\n+  public float getFloat()\n+  {\n+    throw new UnsupportedOperationException(\"VarianceAggregator does not support getFloat()\");\n+  }\n+\n+  @Override\n+  public long getLong()\n+  {\n+    throw new UnsupportedOperationException(\"VarianceAggregator does not support getLong()\");\n+  }\n+\n+  public static final class FloatVarianceAggregator extends VarianceAggregator\n+  {\n+    private final FloatColumnSelector selector;\n+\n+    public FloatVarianceAggregator(String name, FloatColumnSelector selector)\n+    {\n+      super(name);\n+      this.selector = selector;\n+    }\n+\n+    @Override\n+    public void aggregate()\n+    {\n+      holder.add(selector.get());\n+    }\n+\n+    @Override\n+    public Aggregator clone()","path":"extensions-core/stats/src/main/java/io/druid/query/aggregation/variance/VarianceAggregator.java","position":92,"original_position":92,"commit_id":"43a6a73a8ea8047ea46821043b0e986d9954db3c","original_commit_id":"43a6a73a8ea8047ea46821043b0e986d9954db3c","user":{"login":"navis","id":809395,"avatar_url":"https://avatars.githubusercontent.com/u/809395?v=3","gravatar_id":"","url":"https://api.github.com/users/navis","html_url":"https://github.com/navis","followers_url":"https://api.github.com/users/navis/followers","following_url":"https://api.github.com/users/navis/following{/other_user}","gists_url":"https://api.github.com/users/navis/gists{/gist_id}","starred_url":"https://api.github.com/users/navis/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/navis/subscriptions","organizations_url":"https://api.github.com/users/navis/orgs","repos_url":"https://api.github.com/users/navis/repos","events_url":"https://api.github.com/users/navis/events{/privacy}","received_events_url":"https://api.github.com/users/navis/received_events","type":"User","site_admin":false},"body":"It's all over the basic aggregators like min/max/count/sum, etc. So I thought it's needed. removed.","created_at":"2016-05-12T05:22:24Z","updated_at":"2016-05-12T05:22:24Z","html_url":"https://github.com/druid-io/druid/pull/2525#discussion_r62966358","pull_request_url":"https://api.github.com/repos/druid-io/druid/pulls/2525","_links":{"self":{"href":"https://api.github.com/repos/druid-io/druid/pulls/comments/62966358"},"html":{"href":"https://github.com/druid-io/druid/pull/2525#discussion_r62966358"},"pull_request":{"href":"https://api.github.com/repos/druid-io/druid/pulls/2525"}}},"pull_request":{"url":"https://api.github.com/repos/druid-io/druid/pulls/2525","id":60333550,"html_url":"https://github.com/druid-io/druid/pull/2525","diff_url":"https://github.com/druid-io/druid/pull/2525.diff","patch_url":"https://github.com/druid-io/druid/pull/2525.patch","issue_url":"https://api.github.com/repos/druid-io/druid/issues/2525","number":2525,"state":"open","locked":false,"title":"Support variance and standard deviation","user":{"login":"navis","id":809395,"avatar_url":"https://avatars.githubusercontent.com/u/809395?v=3","gravatar_id":"","url":"https://api.github.com/users/navis","html_url":"https://github.com/navis","followers_url":"https://api.github.com/users/navis/followers","following_url":"https://api.github.com/users/navis/following{/other_user}","gists_url":"https://api.github.com/users/navis/gists{/gist_id}","starred_url":"https://api.github.com/users/navis/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/navis/subscriptions","organizations_url":"https://api.github.com/users/navis/orgs","repos_url":"https://api.github.com/users/navis/repos","events_url":"https://api.github.com/users/navis/events{/privacy}","received_events_url":"https://api.github.com/users/navis/received_events","type":"User","site_admin":false},"body":"Aggregator for variance. Algorithm is copied from hive UDAF.","created_at":"2016-02-23T12:40:15Z","updated_at":"2016-05-12T05:22:24Z","closed_at":null,"merged_at":null,"merge_commit_sha":"a49bccd6c133c1b667237270440ceaf1c3831da0","assignee":null,"milestone":{"url":"https://api.github.com/repos/druid-io/druid/milestones/18","html_url":"https://github.com/druid-io/druid/milestones/0.9.1","labels_url":"https://api.github.com/repos/druid-io/druid/milestones/18/labels","id":1526819,"number":18,"title":"0.9.1","description":"","creator":{"login":"fjy","id":428325,"avatar_url":"https://avatars.githubusercontent.com/u/428325?v=3","gravatar_id":"","url":"https://api.github.com/users/fjy","html_url":"https://github.com/fjy","followers_url":"https://api.github.com/users/fjy/followers","following_url":"https://api.github.com/users/fjy/following{/other_user}","gists_url":"https://api.github.com/users/fjy/gists{/gist_id}","starred_url":"https://api.github.com/users/fjy/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/fjy/subscriptions","organizations_url":"https://api.github.com/users/fjy/orgs","repos_url":"https://api.github.com/users/fjy/repos","events_url":"https://api.github.com/users/fjy/events{/privacy}","received_events_url":"https://api.github.com/users/fjy/received_events","type":"User","site_admin":false},"open_issues":6,"closed_issues":251,"state":"open","created_at":"2016-01-20T19:04:22Z","updated_at":"2016-05-12T03:14:18Z","due_on":null,"closed_at":null},"commits_url":"https://api.github.com/repos/druid-io/druid/pulls/2525/commits","review_comments_url":"https://api.github.com/repos/druid-io/druid/pulls/2525/comments","review_comment_url":"https://api.github.com/repos/druid-io/druid/pulls/comments{/number}","comments_url":"https://api.github.com/repos/druid-io/druid/issues/2525/comments","statuses_url":"https://api.github.com/repos/druid-io/druid/statuses/43a6a73a8ea8047ea46821043b0e986d9954db3c","head":{"label":"navis:support-variance-aggregator","ref":"support-variance-aggregator","sha":"43a6a73a8ea8047ea46821043b0e986d9954db3c","user":{"login":"navis","id":809395,"avatar_url":"https://avatars.githubusercontent.com/u/809395?v=3","gravatar_id":"","url":"https://api.github.com/users/navis","html_url":"https://github.com/navis","followers_url":"https://api.github.com/users/navis/followers","following_url":"https://api.github.com/users/navis/following{/other_user}","gists_url":"https://api.github.com/users/navis/gists{/gist_id}","starred_url":"https://api.github.com/users/navis/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/navis/subscriptions","organizations_url":"https://api.github.com/users/navis/orgs","repos_url":"https://api.github.com/users/navis/repos","events_url":"https://api.github.com/users/navis/events{/privacy}","received_events_url":"https://api.github.com/users/navis/received_events","type":"User","site_admin":false},"repo":{"id":45149930,"name":"druid","full_name":"navis/druid","owner":{"login":"navis","id":809395,"avatar_url":"https://avatars.githubusercontent.com/u/809395?v=3","gravatar_id":"","url":"https://api.github.com/users/navis","html_url":"https://github.com/navis","followers_url":"https://api.github.com/users/navis/followers","following_url":"https://api.github.com/users/navis/following{/other_user}","gists_url":"https://api.github.com/users/navis/gists{/gist_id}","starred_url":"https://api.github.com/users/navis/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/navis/subscriptions","organizations_url":"https://api.github.com/users/navis/orgs","repos_url":"https://api.github.com/users/navis/repos","events_url":"https://api.github.com/users/navis/events{/privacy}","received_events_url":"https://api.github.com/users/navis/received_events","type":"User","site_admin":false},"private":false,"html_url":"https://github.com/navis/druid","description":"Column 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