[LENS-1350] Result formatting is throwing NPE when the result from druid driver is empty

• Type: Bug
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Component/s: driver-jdbc
• Assignee: Rajitha R
• Reporter: Archana H
• Created: 05/Oct/16 12:34
• Updated: 09/Nov/16 11:22

Description

Error:

05 Oct 2016 10:55:29 [3f290017-e51d-4183-8f89-0f3045cc52dc] [ResultFormatter_AsyncThread-7] INFO  org.apache.lens.server.api.query.QueryContext - Registering driver resultset for query 3f290017-e51d-4183-8f89-0f3045cc52dc
05 Oct 2016 10:55:29 [3f290017-e51d-4183-8f89-0f3045cc52dc] [454e896f-65b0-4c9d-b282-190f00affccf grizzly-http-server-19] INFO  org.apache.hadoop.hive.conf.HiveConf - Using the default value passed in for log id: 454e896f-65b0-4c9d-b282-190f00affccf
05 Oct 2016 10:55:29 [3f290017-e51d-4183-8f89-0f3045cc52dc] [454e896f-65b0-4c9d-b282-190f00affccf grizzly-http-server-19] INFO  org.apache.lens.server.query.QueryExecutionServiceImpl - Updating status for 3f290017-e51d-4183-8f89-0f3045cc52dc
05 Oct 2016 10:55:29 [3f290017-e51d-4183-8f89-0f3045cc52dc] [ResultFormatter_AsyncThread-7] ERROR org.apache.lens.driver.jdbc.JDBCResultSet - Error getting JDBC type information: null
java.lang.NullPointerException: null
        at org.apache.lens.driver.jdbc.JDBCResultSet.getRsMetadata(JDBCResultSet.java:87) ~[lens-driver-jdbc-2.7.0-SNAPSHOT.jar:2.7.0-SNAPSHOT]
        at org.apache.lens.driver.jdbc.JDBCResultSet.getMetadata(JDBCResultSet.java:112) ~[lens-driver-jdbc-2.7.0-SNAPSHOT.jar:2.7.0-SNAPSHOT]
        at org.apache.lens.server.api.driver.PartiallyFetchedInMemoryResultSet.<init>(PartiallyFetchedInMemoryResultSet.java:94) [lens-server-api-2.7.0-SNAPSHOT.jar:2.7.0-SNAPSHOT]
        at org.apache.lens.server.api.query.QueryContext.registerDriverResult(QueryContext.java:514) [lens-server-api-2.7.0-SNAPSHOT.jar:2.7.0-SNAPSHOT]
        at org.apache.lens.server.api.driver.AbstractLensDriver.fetchResultSet(AbstractLensDriver.java:69) [lens-server-api-2.7.0-SNAPSHOT.jar:2.7.0-SNAPSHOT]
        at org.apache.lens.server.query.QueryExecutionServiceImpl.getDriverResultset(QueryExecutionServiceImpl.java:1835) [classes/:na]
        at org.apache.lens.server.query.ResultFormatter.formatOutput(ResultFormatter.java:91) [classes/:na]
        at org.apache.lens.server.query.ResultFormatter.process(ResultFormatter.java:73) [classes/:na]
        at org.apache.lens.server.query.ResultFormatter.process(ResultFormatter.java:43) [classes/:na]
        at org.apache.lens.server.api.events.AsyncEventListener$1.run(AsyncEventListener.java:110) [lens-server-api-2.7.0-SNAPSHOT.jar:2.7.0-SNAPSHOT]
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) [na:1.8.0_40]
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) [na:1.8.0_40]
        at java.lang.Thread.run(Thread.java:745) [na:1.8.0_40]
05 Oct 2016 10:55:29 [3f290017-e51d-4183-8f89-0f3045cc52dc] [ResultFormatter_AsyncThread-7] WARN  org.apache.lens.server.query.ResultFormatter - Exception while formatting result for 3f290017-e51d-4183-8f89-0f3045cc52dc
java.lang.NullPointerException: null
        at org.apache.lens.driver.jdbc.JDBCResultSet.hasNext(JDBCResultSet.java:306) ~[lens-driver-jdbc-2.7.0-SNAPSHOT.jar:2.7.0-SNAPSHOT]
        at org.apache.lens.server.api.driver.PartiallyFetchedInMemoryResultSet.preFetchRows(PartiallyFetchedInMemoryResultSet.java:104) ~[lens-server-api-2.7.0-SNAPSHOT.jar:2.7.0-SNAPSHOT]
        at org.apache.lens.server.api.driver.PartiallyFetchedInMemoryResultSet.<init>(PartiallyFetchedInMemoryResultSet.java:95) ~[lens-server-api-2.7.0-SNAPSHOT.jar:2.7.0-SNAPSHOT]
        at org.apache.lens.server.api.query.QueryContext.registerDriverResult(QueryContext.java:514) ~[lens-server-api-2.7.0-SNAPSHOT.jar:2.7.0-SNAPSHOT]
        at org.apache.lens.server.api.driver.AbstractLensDriver.fetchResultSet(AbstractLensDriver.java:69) ~[lens-server-api-2.7.0-SNAPSHOT.jar:2.7.0-SNAPSHOT]
        at org.apache.lens.server.query.QueryExecutionServiceImpl.getDriverResultset(QueryExecutionServiceImpl.java:1835) ~[classes/:na]
        at org.apache.lens.server.query.ResultFormatter.formatOutput(ResultFormatter.java:91) [classes/:na]
        at org.apache.lens.server.query.ResultFormatter.process(ResultFormatter.java:73) [classes/:na]
        at org.apache.lens.server.query.ResultFormatter.process(ResultFormatter.java:43) [classes/:na]
        at org.apache.lens.server.api.events.AsyncEventListener$1.run(AsyncEventListener.java:110) [lens-server-api-2.7.0-SNAPSHOT.jar:2.7.0-SNAPSHOT]
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) [na:1.8.0_40]
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) [na:1.8.0_40]
        at java.lang.Thread.run(Thread.java:745) [na:1.8.0_40]

Issue Links

• Is contained by: LENS-1369 Druid query rewriter issues