{"action":"created","comment":{"url":"https://api.github.com/repos/apache/spark/pulls/comments/50630089","id":50630089,"diff_hunk":"@@ -0,0 +1,268 @@\n+/*\n+ * Licensed to the Apache Software Foundation (ASF) under one or more\n+ * contributor license agreements.  See the NOTICE file distributed with\n+ * this work for additional information regarding copyright ownership.\n+ * The ASF licenses this file to You under the Apache License, Version 2.0\n+ * (the \"License\"); you may not use this file except in compliance with\n+ * 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, software\n+ * distributed under the License is distributed on an \"AS IS\" BASIS,\n+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n+ * See the License for the specific language governing permissions and\n+ * limitations under the License.\n+ */\n+\n+package org.apache.spark.util.sketch;\n+\n+import java.io.OutputStream;\n+import java.io.UnsupportedEncodingException;\n+import java.util.Arrays;\n+import java.util.Random;\n+\n+class CountMinSketchImpl extends CountMinSketch {\n+  public static final long PRIME_MODULUS = (1L << 31) - 1;\n+\n+  private int depth;\n+  private int width;\n+  private long[][] table;\n+  private long[] hashA;\n+  private long totalCount;\n+  private double eps;\n+  private double confidence;\n+\n+  public CountMinSketchImpl(int depth, int width, int seed) {","path":"common/sketch/src/main/java/org/apache/spark/util/sketch/CountMinSketchImpl.java","position":36,"original_position":36,"commit_id":"65853adaa563d24eac10f0086190fba9bc5bfc23","original_commit_id":"65853adaa563d24eac10f0086190fba9bc5bfc23","user":{"login":"rxin","id":323388,"avatar_url":"https://avatars.githubusercontent.com/u/323388?v=3","gravatar_id":"","url":"https://api.github.com/users/rxin","html_url":"https://github.com/rxin","followers_url":"https://api.github.com/users/rxin/followers","following_url":"https://api.github.com/users/rxin/following{/other_user}","gists_url":"https://api.github.com/users/rxin/gists{/gist_id}","starred_url":"https://api.github.com/users/rxin/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/rxin/subscriptions","organizations_url":"https://api.github.com/users/rxin/orgs","repos_url":"https://api.github.com/users/rxin/repos","events_url":"https://api.github.com/users/rxin/events{/privacy}","received_events_url":"https://api.github.com/users/rxin/received_events","type":"User","site_admin":false},"body":"ctor should be package private (drop public)","created_at":"2016-01-24T04:41:12Z","updated_at":"2016-01-24T04:41:12Z","html_url":"https://github.com/apache/spark/pull/10851#discussion_r50630089","pull_request_url":"https://api.github.com/repos/apache/spark/pulls/10851","_links":{"self":{"href":"https://api.github.com/repos/apache/spark/pulls/comments/50630089"},"html":{"href":"https://github.com/apache/spark/pull/10851#discussion_r50630089"},"pull_request":{"href":"https://api.github.com/repos/apache/spark/pulls/10851"}}},"pull_request":{"url":"https://api.github.com/repos/apache/spark/pulls/10851","id":56672568,"html_url":"https://github.com/apache/spark/pull/10851","diff_url":"https://github.com/apache/spark/pull/10851.diff","patch_url":"https://github.com/apache/spark/pull/10851.patch","issue_url":"https://api.github.com/repos/apache/spark/issues/10851","number":10851,"state":"closed","locked":false,"title":"[SPARK-12933][SQL] Initial implementation of Count-Min sketch","user":{"login":"liancheng","id":230655,"avatar_url":"https://avatars.githubusercontent.com/u/230655?v=3","gravatar_id":"","url":"https://api.github.com/users/liancheng","html_url":"https://github.com/liancheng","followers_url":"https://api.github.com/users/liancheng/followers","following_url":"https://api.github.com/users/liancheng/following{/other_user}","gists_url":"https://api.github.com/users/liancheng/gists{/gist_id}","starred_url":"https://api.github.com/users/liancheng/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/liancheng/subscriptions","organizations_url":"https://api.github.com/users/liancheng/orgs","repos_url":"https://api.github.com/users/liancheng/repos","events_url":"https://api.github.com/users/liancheng/events{/privacy}","received_events_url":"https://api.github.com/users/liancheng/received_events","type":"User","site_admin":false},"body":"This PR adds an initial implementation of count min sketch, contained in a new module spark-sketch under `common/sketch`. The implementation is based on the [`CountMinSketch` class in stream-lib][1].\r\n\r\nAs required by the [design doc][2], spark-sketch should have no external dependency. \r\nTwo classes, `Murmur3_x86_32` and `Platform` are copied to spark-sketch from spark-unsafe for hashing facilities. They'll also be used in the upcoming bloom filter implementation.\r\n\r\nThe following features will be added in future follow-up PRs:\r\n\r\n- Serialization support\r\n- DataFrame API integration\r\n\r\n[1]: https://github.com/addthis/stream-lib/blob/aac6b4d23a8686b000f80baa447e0922ecac3bcb/src/main/java/com/clearspring/analytics/stream/frequency/CountMinSketch.java\r\n[2]: https://issues.apache.org/jira/secure/attachment/12782378/BloomFilterandCount-MinSketchinSpark2.0.pdf","created_at":"2016-01-20T21:50:42Z","updated_at":"2016-01-24T04:41:12Z","closed_at":"2016-01-23T08:36:23Z","merged_at":null,"merge_commit_sha":"5834a13bbac32dc7076a12e092d40648d04af75d","assignee":null,"milestone":null,"commits_url":"https://api.github.com/repos/apache/spark/pulls/10851/commits","review_comments_url":"https://api.github.com/repos/apache/spark/pulls/10851/comments","review_comment_url":"https://api.github.com/repos/apache/spark/pulls/comments{/number}","comments_url":"https://api.github.com/repos/apache/spark/issues/10851/comments","statuses_url":"https://api.github.com/repos/apache/spark/statuses/65853adaa563d24eac10f0086190fba9bc5bfc23","head":{"label":"liancheng:count-min-sketch","ref":"count-min-sketch","sha":"65853adaa563d24eac10f0086190fba9bc5bfc23","user":{"login":"liancheng","id":230655,"avatar_url":"https://avatars.githubusercontent.com/u/230655?v=3","gravatar_id":"","url":"https://api.github.com/users/liancheng","html_url":"https://github.com/liancheng","followers_url":"https://api.github.com/users/liancheng/followers","following_url":"https://api.github.com/users/liancheng/following{/other_user}","gists_url":"https://api.github.com/users/liancheng/gists{/gist_id}","starred_url":"https://api.github.com/users/liancheng/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/liancheng/subscriptions","organizations_url":"https://api.github.com/users/liancheng/orgs","repos_url":"https://api.github.com/users/liancheng/repos","events_url":"https://api.github.com/users/liancheng/events{/privacy}","received_events_url":"https://api.github.com/users/liancheng/received_events","type":"User","site_admin":false},"repo":{"id":17232535,"name":"spark","full_name":"liancheng/spark","owner":{"login":"liancheng","id":230655,"avatar_url":"https://avatars.githubusercontent.com/u/230655?v=3","gravatar_id":"","url":"https://api.github.com/users/liancheng","html_url":"https://github.com/liancheng","followers_url":"https://api.github.com/users/liancheng/followers","following_url":"https://api.github.com/users/liancheng/following{/other_user}","gists_url":"https://api.github.com/users/liancheng/gists{/gist_id}","starred_url":"https://api.github.com/users/liancheng/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/liancheng/subscriptions","organizations_url":"https://api.github.com/users/liancheng/orgs","repos_url":"https://api.github.com/users/liancheng/repos","events_url":"https://api.github.com/users/liancheng/events{/privacy}","received_events_url":"https://api.github.com/users/liancheng/received_events","type":"User","site_admin":false},"private":false,"html_url":"https://github.com/liancheng/spark","description":"Mirror 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