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https://issues.apache.org/jira/browse/FLINK-9593?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16524986#comment-16524986
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ASF GitHub Bot commented on FLINK-9593:
---------------------------------------
Github user kl0u commented on a diff in the pull request:
https://github.com/apache/flink/pull/6171#discussion_r198473426
--- Diff:
flink-libraries/flink-cep/src/main/java/org/apache/flink/cep/nfa/aftermatch/AfterMatchSkipStrategy.java
---
@@ -0,0 +1,155 @@
+/*
+ * 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.cep.nfa.aftermatch;
+
+import org.apache.flink.cep.nfa.ComputationState;
+import org.apache.flink.cep.nfa.sharedbuffer.EventId;
+import org.apache.flink.cep.nfa.sharedbuffer.SharedBuffer;
+
+import java.io.Serializable;
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.List;
+import java.util.Map;
+import java.util.Optional;
+
+
+/**
+ * Indicate the skip strategy after a match process.
+ */
+public abstract class AfterMatchSkipStrategy implements Serializable {
+
+ private static final long serialVersionUID = -4048930333619068531L;
+
+ /**
+ * Discards every partial match that contains event of the match
preceding the first of *PatternName*.
+ *
+ * @param patternName the pattern name to skip to
+ * @return the created AfterMatchSkipStrategy
+ */
+ public static AfterMatchSkipStrategy skipToFirst(String patternName) {
+ return new SkipToFirstStrategy(patternName);
+ }
+
+ /**
+ * Discards every partial match that contains event of the match
preceding the last of *PatternName*.
+ *
+ * @param patternName the pattern name to skip to
+ * @return the created AfterMatchSkipStrategy
+ */
+ public static AfterMatchSkipStrategy skipToLast(String patternName) {
+ return new SkipToLastStrategy(patternName);
+ }
+
+ /**
+ * Discards every partial match that contains event of the match.
+ *
+ * @return the created AfterMatchSkipStrategy
+ */
+ public static AfterMatchSkipStrategy skipPastLastEvent() {
+ return SkipPastLastStrategy.INSTANCE;
+ }
+
+ /**
+ * Every possible match will be emitted.
+ *
+ * @return the created AfterMatchSkipStrategy
+ */
+ public static AfterMatchSkipStrategy noSkip() {
+ return NoSkipStrategy.INSTANCE;
+ }
+
+ /**
+ * Tells if the strategy may skip some matches.
+ *
+ * @return false if the strategy is NO_SKIP strategy
+ */
+ public abstract boolean isSkipStrategy();
+
+ /**
+ * Prunes matches/partial matches based on the chosen strategy.
+ *
+ * @param partialMatches current partial matches
+ * @param matchedResult already completed matches
+ * @param sharedBuffer corresponding shared buffer
+ * @throws Exception thrown if could not access the state
+ */
+ public void prune(
+ Collection<ComputationState> partialMatches,
--- End diff --
The name `partialMatches` is misleading because we use it also with the
`completedMatches`.
> Unify AfterMatch semantics with SQL MATCH_RECOGNIZE
> ---------------------------------------------------
>
> Key: FLINK-9593
> URL: https://issues.apache.org/jira/browse/FLINK-9593
> Project: Flink
> Issue Type: Improvement
> Components: CEP
> Reporter: Dawid Wysakowicz
> Assignee: Dawid Wysakowicz
> Priority: Major
> Labels: pull-request-available
>
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