[GitHub] [iotdb] HTHou commented on a change in pull request #2566: add some comments for SeriesReader

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

HTHou commented on a change in pull request #2566:
URL: https://github.com/apache/iotdb/pull/2566#discussion_r578178855



##########
File path: server/src/main/java/org/apache/iotdb/db/query/reader/series/SeriesReader.java
##########
@@ -390,15 +390,36 @@ boolean hasNextPage() throws IOException {
       /*
        * first chunk metadata is already unpacked, consume cached pages
        */
-      initFirstPageReader();
-      if (firstPageReader != null) {
-        long endpointTime = orderUtils.getOverlapCheckTime(firstPageReader.getStatistics());
-        unpackAllOverlappedTsFilesToTimeSeriesMetadata(endpointTime);
-        unpackAllOverlappedTimeSeriesMetadataToCachedChunkMetadata(endpointTime, false);
-        unpackAllOverlappedChunkMetadataToCachedPageReaders(endpointTime, false);
+      unpackFirstPageReader();
+    }
+
+    if (isExistOverlappedPage()) {
+      return true;
+    }
+
+    // make sure firstPageReader won't be null while cachedPageReaders has more cached page readers

Review comment:
       ```suggestion
       // make sure firstPageReader won't be null while the cachedPageReaders has more cached page readers
   ```




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