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From QiangCai <...@git.apache.org>
Subject [GitHub] carbondata pull request #916: [CARBONDATA-938] Prune partitions for filter q...
Date Fri, 19 May 2017 02:45:05 GMT
Github user QiangCai commented on a diff in the pull request:

    https://github.com/apache/carbondata/pull/916#discussion_r117394103
  
    --- Diff: hadoop/src/main/java/org/apache/carbondata/hadoop/CarbonInputFormat.java ---
    @@ -255,11 +258,32 @@ private static AbsoluteTableIdentifier getAbsoluteTableIdentifier(Configuration
           if (null == carbonTable) {
             throw new IOException("Missing/Corrupt schema file for table.");
           }
    +
           CarbonInputFormatUtil.processFilterExpression(filter, carbonTable);
    +
    +      // prune partitions for filter query on partition table
    +      BitSet partitionMap = null;
    +      if (null != filter) {
    +        PartitionInfo partitionInfo = carbonTable.getPartitionInfo(carbonTable.getFactTableName());
    +        if (null != partitionInfo) {
    +          Partitioner partitioner = PartitionUtil.getPartitioner(partitionInfo);
    +          partitionMap = new FilterExpressionProcessor()
    +              .getFilteredPartitions(filter, partitionInfo, partitioner);
    +          if (partitionMap.cardinality() == 0) {
    +            // no partition is required
    +            return new ArrayList<InputSplit>();
    +          }
    +          if (partitionMap.cardinality() == partitioner.numPartitions()) {
    --- End diff --
    
    If all partitions are matched or not matched, we can release BitSet object.


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