Github user jinfengni commented on a diff in the pull request: https://github.com/apache/drill/pull/519#discussion_r67711244 --- Diff: exec/java-exec/src/main/java/org/apache/drill/exec/planner/logical/partition/PruneScanRule.java --- @@ -269,13 +283,54 @@ protected void doOnMatch(RelOptRuleCall call, Filter filterRel, Project projectR int recordCount = 0; int qualifiedCount = 0; - // Inner loop: within each batch iterate over the PartitionLocations - for(PartitionLocation part: partitions){ - if(!output.getAccessor().isNull(recordCount) && output.getAccessor().get(recordCount) == 1){ - newPartitions.add(part); - qualifiedCount++; + if (checkForSingle && + partitions.get(0).isCompositePartition() /* apply single partition check only for composite partitions */) { + // Inner loop: within each batch iterate over the PartitionLocations + for (PartitionLocation part : partitions) { + assert part.isCompositePartition(); + if(!output.getAccessor().isNull(recordCount) && output.getAccessor().get(recordCount) == 1) { + newPartitions.add(part); + if (isSinglePartition) { // only need to do this if we are already single partition + // compose the array of partition values for the directories that are referenced by filter: + // e.g suppose the dir hierarchy is year/quarter/month and the query is: + // SELECT * FROM T WHERE dir0=2015 AND dir1 = 'Q1', + // then for 2015/Q1/Feb, this will have ['2015', 'Q1', null] --- End diff -- For WHERE condition dir0=2015 and dir2 = 'Jan', if the dataset happens to have only one 'Jan' under '2015' directory, will this qualify for singlePartitionOpt?
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