[jira] [Created] (DRILL-6816) NPE - Concurrent query execution using PreparedStatement

["Khurram Faraaz (JIRA)" <ji...@apache.org>]

Khurram Faraaz created DRILL-6816:
-------------------------------------

             Summary: NPE - Concurrent query execution using PreparedStatement 
                 Key: DRILL-6816
                 URL: https://issues.apache.org/jira/browse/DRILL-6816
             Project: Apache Drill
          Issue Type: Bug
    Affects Versions: 1.14.0
            Reporter: Khurram Faraaz


Concurrent query execution from JDBC program using PreparedStatement results in NPE.

Queries that were executed concurrently are (part of a query file),
{noformat}
select id from `test_tbl.json`
select count(id) from `test_tbl.json`
select count(*) from `test_tbl.json`
select * from `test_tbl.json`
{noformat}

Drill 1.14.0
git.commit.id=35a1ae23c9b280b9e73cb0f6f01808c996515454
MapR version => 6.1.0.20180911143226.GA (secure cluster)

Executing the above queries concurrently using a Statement object results in successful query execution.

{noformat}
Statement stmt = conn.createStatement();
ResultSet rs = stmt.executeQuery(query);
{noformat}

However, when the same queries listed above are executed using a PreparedStatement object we see an NPE 
{noformat}
PreparedStatement prdstmnt = conn.prepareStatement(query);
prdstmnt.executeUpdate();
{noformat}


Stack trace from drillbit.log
{noformat}
java.lang.NullPointerException
 at java.util.Objects.requireNonNull(Objects.java:203)
 at org.apache.calcite.avatica.Meta$MetaResultSet.create(Meta.java:577)
 at org.apache.drill.jdbc.impl.DrillMetaImpl.execute(DrillMetaImpl.java:1143)
 at org.apache.drill.jdbc.impl.DrillMetaImpl.execute(DrillMetaImpl.java:1150)
 at org.apache.calcite.avatica.AvaticaConnection.executeQueryInternal(AvaticaConnection.java:511)
 at org.apache.calcite.avatica.AvaticaPreparedStatement.executeLargeUpdate(AvaticaPreparedStatement.java:146)
 at org.apache.drill.jdbc.impl.DrillPreparedStatementImpl.executeLargeUpdate(DrillPreparedStatementImpl.java:512)
 at org.apache.calcite.avatica.AvaticaPreparedStatement.executeUpdate(AvaticaPreparedStatement.java:142)
 at RunQuery.executeQuery(RunQuery.java:61)
 at RunQuery.run(RunQuery.java:30)
 at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
 at java.util.concurrent.FutureTask.run(FutureTask.java:266)
 at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
 at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
 at java.lang.Thread.run(Thread.java:748)
{noformat}



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