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Subject [GitHub] [flink] sunsence edited a comment on issue #6124: [FLINK-8914][CEP]Fix wrong semantic when greedy pattern is the head of the pattern
Date Wed, 06 Mar 2019 07:07:57 GMT
sunsence edited a comment on issue #6124: [FLINK-8914][CEP]Fix wrong semantic when greedy pattern
is the head of the pattern
URL: https://github.com/apache/flink/pull/6124#issuecomment-469992799
 
 
   @dawidwys The proper AfterMatchSkip strategy can only work on some situations, such as

   
   `List<String> strings = Arrays.asList("1,3,5,5,5,5,1,6,".split(","));
   
           DataStream<String> input = env.fromCollection(strings);
   
           Pattern<String, ?> pattern = Pattern.<String>
                   begin("start", AfterMatchSkipStrategy.skipPastLastEvent()).where(new SimpleCondition<String>()
{
               @Override
               public boolean filter(String value) {
                   return value.equals("5");
               }
           }).oneOrMore()
                   .followedBy("end").where(new SimpleCondition<String>() {
   
                       @Override
                       public boolean filter(String value) {
                           return value.equals("6");
                       }
                   });`
   
   The output is :
   **=======
   5
   5
   5
   5
   6
   =======**
   
   While ,when I have only one pattern´╝îit doesn't work fine.
   
   
   ` List<String> strings = Arrays.asList("1,3,5,5,5,5,1,6,".split(","));
   
           DataStream<String> input = env.fromCollection(strings);
   
           Pattern<String, ?> pattern = Pattern.<String>
                   begin("start", AfterMatchSkipStrategy.skipPastLastEvent()).where(new SimpleCondition<String>()
{
               @Override
               public boolean filter(String value) {
                   return value.equals("5");
               }
           }).oneOrMore().greedy()`
   
   The output is :
   =======
   5
   ======
   =======
   5
   ======
   =======
   5
   ======
   =======
   5
   ======
   
   
   

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