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https://issues.apache.org/jira/browse/FLINK-7062?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16654827#comment-16654827
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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_r226184786
##########
File path:
flink-libraries/flink-table/src/test/scala/org/apache/flink/table/api/stream/sql/MatchRecognizeTest.scala
##########
@@ -0,0 +1,61 @@
+/*
+ * 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.api.stream.sql
+
+import org.apache.flink.api.scala._
+import org.apache.flink.table.api.scala._
+import org.apache.flink.table.utils.TableTestUtil.{term, _}
+import org.apache.flink.table.utils.{StreamTableTestUtil, TableTestBase}
+import org.junit.Test
+
+class MatchRecognizeTest extends TableTestBase {
+ private val streamUtil: StreamTableTestUtil = streamTestUtil()
+ streamUtil.addTable[(Int, String, Long)]("MyTable", 'a, 'b, 'c.rowtime,
'proctime.proctime)
+
+ @Test
+ def testSimpleWithDefaults(): Unit = {
+ val sqlQuery =
+ """SELECT T.aa as ta
+ |FROM MyTable
+ |MATCH_RECOGNIZE (
+ | ORDER BY proctime
+ | MEASURES
+ | A.a as aa
+ | PATTERN (A B)
+ | DEFINE
+ | A AS a = 1,
+ | B AS b = 'b'
+ |) AS T""".stripMargin
+
+ val expected = unaryNode(
+ "DataStreamMatch",
+ streamTableNode(0),
+ term("orderBy", "proctime"),
+ term("measures", "FINAL(A.a) AS aa"),
+ term("rowsPerMatch", "ONE ROW PER MATCH"),
+ term("after",
+ "SKIP TO NEXT ROW"), //this is not SQL-standard compliant, SKIP PAST
LAST
+ // should be the default
+ term("pattern", "('A', 'B')"),
+ term("define", "{A==(LAST(*.$0, 0), 1)", "B==(LAST(*.$1, 0), 'b')}"))
+
+ streamUtil.verifySql(sqlQuery, expected)
+ }
+
Review comment:
nit: remove empty line
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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 & 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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