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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-7062) Support the basic functionality of MATCH_RECOGNIZE
Date Fri, 19 Oct 2018 09:31:02 GMT

    [ https://issues.apache.org/jira/browse/FLINK-7062?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16656513#comment-16656513
] 

ASF GitHub Bot commented on FLINK-7062:
---------------------------------------

twalthr commented on a change in pull request #6815:  [FLINK-7062][cep][table] Added basic
support for MATCH_RECOGNIZE
URL: https://github.com/apache/flink/pull/6815#discussion_r226565641
 
 

 ##########
 File path: flink-libraries/flink-table/src/main/scala/org/apache/flink/table/runtime/match/PatternSelectFunctionRunner.scala
 ##########
 @@ -0,0 +1,75 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.flink.table.runtime.`match`
+
+import java.io.{IOException, ObjectInputStream}
+import java.util
+
+import org.apache.flink.cep.{PatternFlatSelectFunction, PatternSelectFunction}
+import org.apache.flink.streaming.api.operators.TimestampedCollector
+import org.apache.flink.table.codegen.Compiler
+import org.apache.flink.table.runtime.types.CRow
+import org.apache.flink.types.Row
+import org.apache.flink.util.Collector
+import org.slf4j.LoggerFactory
+
+/**
+  * PatternSelectFunctionRunner with [[Row]] input and [[CRow]] output.
+  */
+class PatternSelectFunctionRunner(
+    name: String,
+    code: String)
+  extends PatternFlatSelectFunction[Row, CRow]
+  with Compiler[PatternSelectFunction[Row, Row]] {
+
+  private val LOG = LoggerFactory.getLogger(this.getClass)
+
+  private var outCRow: CRow = _
+
+  private var function: PatternSelectFunction[Row, Row] = _
+
+  def init(): Unit = {
+    LOG.debug(s"Compiling PatternSelectFunction: $name \n\n Code:\n$code")
+    val clazz = compile(Thread.currentThread().getContextClassLoader, name, code)
+    LOG.debug("Instantiating PatternSelectFunction.")
+    function = clazz.newInstance()
+  }
+
+  override def flatSelect(
+      pattern: util.Map[String, util.List[Row]],
+      out: Collector[CRow])
+    : Unit = {
+    if (outCRow == null) {
 
 Review comment:
   Move this to `readObject` as well?

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> Support the basic functionality of MATCH_RECOGNIZE
> --------------------------------------------------
>
>                 Key: FLINK-7062
>                 URL: https://issues.apache.org/jira/browse/FLINK-7062
>             Project: Flink
>          Issue Type: Sub-task
>          Components: CEP, Table API &amp; SQL
>            Reporter: Dian Fu
>            Assignee: Dian Fu
>            Priority: Major
>              Labels: pull-request-available
>
> In this JIRA, we will support the basic functionality of {{MATCH_RECOGNIZE}} in Flink
SQL API which includes the support of syntax {{MEASURES}}, {{PATTERN}} and {{DEFINE}}. This
would allow users write basic cep use cases with SQL like the following example:
> {code}
> SELECT T.aid, T.bid, T.cid
> FROM MyTable
> MATCH_RECOGNIZE (
>   MEASURES
>     A.id AS aid,
>     B.id AS bid,
>     C.id AS cid
>   PATTERN (A B C)
>   DEFINE
>     A AS A.name = 'a',
>     B AS B.name = 'b',
>     C AS C.name = 'c'
> ) AS T
> {code}



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