[GitHub] [iotdb] Alima777 commented on a change in pull request #3219: add query last data interface

[GitBox <gi...@apache.org>]

Alima777 commented on a change in pull request #3219:
URL: https://github.com/apache/iotdb/pull/3219#discussion_r637760212



##########
File path: thrift/src/main/thrift/rpc.thrift
##########
@@ -291,6 +291,16 @@ struct TSRawDataQueryReq {
   7: optional bool enableRedirectQuery;
 }
 
+struct TSLastDataQueryReq {
+  1: required i64 sessionId
+  2: required list<string> suffixPath
+  3: required list<string> prefixPath

Review comment:
       Just give the complete path, now that we use session, we don't need to concat the path again.

##########
File path: session/src/main/java/org/apache/iotdb/session/Session.java
##########
@@ -589,6 +589,48 @@ public SessionDataSet executeRawDataQuery(List<String> paths, long startTime, lo
     }
   }
 
+  /**
+   * only: select last status from root.ln.wf01.wt01 where time >= 1621326244168; must satisfy
+   * <PrefixPath> + <suffixPath> = <TimeSeries>
+   *
+   * @param suffixPath the timeSeries suffix. eg. root.ln.wf01.wt01
+   * @param prefixPath the timeSeries prefix. eg. status
+   * @param LastTime get the last data,whose timestamp greater than or equal LastTime eg.
+   *     1621326244168

Review comment:
       ```suggestion
      * @param LastTime get the last data, whose timestamp greater than or equal LastTime eg.
      *     1621326244168
   ```




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