[jira] [Created] (DRILL-1859) IllegalReferenceCountException in the decoder inside Netty

["Aman Sinha (JIRA)" <ji...@apache.org>]

Aman Sinha created DRILL-1859:
---------------------------------

             Summary: IllegalReferenceCountException in the decoder inside Netty
                 Key: DRILL-1859
                 URL: https://issues.apache.org/jira/browse/DRILL-1859
             Project: Apache Drill
          Issue Type: Bug
          Components: Execution - RPC
    Affects Versions: 0.7.0
            Reporter: Aman Sinha


The following query does a LIMIT inside a subquery to force a UnionExchange and then does an ORDER-BY outside that will first re-distribute the data before sorting.  It results in a DecoderException in netty.

{code}
0: jdbc:drill:zk=local> alter session set `planner.slice_target` = 10;
+------------+------------+
|     ok     |  summary   |
+------------+------------+
| true       | planner.slice_target updated. |
+------------+------------+
0: jdbc:drill:zk=local> select t2.o_custkey from (select o_orderkey, o_custkey from cp.`tpch/orders.parquet` t1 group by o_orderkey, o_custkey limit 10) t2 order by t2.o_custkey;
Query failed: Query failed: Failure while running fragment., refCnt: 0, decrement: 1 
{code}

Here's partial output from the logs: (will attach full error log).  
{code}
io.netty.handler.codec.DecoderException: io.netty.util.IllegalReferenceCountException: refCnt: 0, decrement: 1
        io.netty.handler.codec.MessageToMessageDecoder.channelRead(MessageToMessageDecoder.java:99) [netty-codec-4.0.24.Final.jar:4.0.24.Final]
        io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:333) [netty-transport-4.0.24.Final.jar:4.0.24.Final]
{code}



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