LeisureChou commented on issue #4947: [function]Does  the pulsar support 
connecting to the database in function?
URL: https://github.com/apache/pulsar/issues/4947#issuecomment-524108229
 
 
   import lombok.*;
   import lombok.experimental.Accessors;
   
   @Data
   @Setter
   @Getter
   @Accessors(chain = true)
   @ToString
   public class WindowConfig {
   
       public static final String WINDOW_CONFIG_KEY = "__WINDOWCONFIGS__";
       /*The number of messages per window*/
       private Integer windowLengthCount;
       /*The time duration of the window in milliseconds*/
       private Long windowLengthDurationMs;
      /*The number of messages after which the window slides*/
       private Integer slidingIntervalCount;
       /*The time duration after which the window slides*/
       private Long slidingIntervalDurationMs;
   
       private String lateDataTopic;
   
       private Long maxLagMs;
   
       private Long watermarkEmitIntervalMs;
   
       private String timestampExtractorClassName;
   
       private String actualWindowFunctionClassName;
   }
   Can  I  customize my 'timestampExtractorClassName' ? How can I customize it?

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