[GitHub] [incubator-iotdb] qiaojialin commented on a change in pull request #466: [IOTDB-208] Bloom filter

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

qiaojialin commented on a change in pull request #466: [IOTDB-208] Bloom filter
URL: https://github.com/apache/incubator-iotdb/pull/466#discussion_r339934761
 
 

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 File path: tsfile/src/main/java/org/apache/iotdb/tsfile/read/query/executor/TsFileExecutor.java
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 @@ -54,6 +58,25 @@ public TsFileExecutor(IMetadataQuerier metadataQuerier, IChunkLoader chunkLoader
 
   @Override
   public QueryDataSet execute(QueryExpression queryExpression) throws IOException {
+    // bloom filter
+    BloomFilter bloomFilter = metadataQuerier.getWholeFileMetadata().getBloomFilter();
+    List<Path> filteredSeriesPath = new ArrayList<>();
+    if (bloomFilter != null) {
+      for (Path path : queryExpression.getSelectedSeries()) {
+        if (bloomFilter.contains(path.getFullPath())) {
+          filteredSeriesPath.add(path);
+        } else {
+          // If one path is not contains in this tsfile, return empty set
+          LOG.debug(
+              "This tsfile not contains paths " + path
+                  + " which specified in selected series, return empty dataset");
+          return new DataSetWithoutTimeGenerator(Collections.emptyList(), Collections.emptyList(),
+              Collections.emptyList());
+        }
+      }
+    }
+    queryExpression.setSelectSeries(filteredSeriesPath);
+    //
 
 Review comment:
   remove this or add comment

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