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From: "Philip Thompson (JIRA)" <jira@apache.org>
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Subject: [jira] [Updated] (CASSANDRA-9636) Duplicate columns in selection
 causes AssertionError
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     [ https://issues.apache.org/jira/browse/CASSANDRA-9636?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Philip Thompson updated CASSANDRA-9636:
---------------------------------------
    Assignee: Sam Tunnicliffe

> Duplicate columns in selection causes AssertionError
> ----------------------------------------------------
>
>                 Key: CASSANDRA-9636
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-9636
>             Project: Cassandra
>          Issue Type: Bug
>            Reporter: Sam Tunnicliffe
>            Assignee: Sam Tunnicliffe
>             Fix For: 2.1.x, 2.0.x, 2.2.0 rc2
>
>
> Prior to CASSANDRA-9532, unaliased duplicate fields in a selection would be silently ignored. Now, they trigger a server side exception and an unfriendly error response, which we should clean up. Duplicate columns *with* aliases are not affected.
> {code}
> CREATE KEYSPACE ks WITH replication = {'class': 'SimpleStrategy', 'replication_factor': 1};
> CREATE TABLE ks.t1 (k int PRIMARY KEY, v int);
> INSERT INTO ks.t2 (k, v) VALUES (0, 0);
> SELECT k, v FROM ks.t2;
> SELECT k, v, v AS other_v FROM ks.t2;
> SELECT k, v, v FROM ks.t2;
> {code}
> The final statement results in this error response & server side stacktrace:
> {code}
> ServerError: <ErrorMessage code=0000 [Server error] message="java.lang.AssertionError">
> ERROR 13:01:30 Unexpected exception during request; channel = [id: 0x44d22e61, /127.0.0.1:39463 => /127.0.0.1:9042]
> java.lang.AssertionError: null
>         at org.apache.cassandra.cql3.ResultSet.addRow(ResultSet.java:63) ~[main/:na]
>         at org.apache.cassandra.cql3.statements.Selection$ResultSetBuilder.build(Selection.java:355) ~[main/:na]
>         at org.apache.cassandra.cql3.statements.SelectStatement.process(SelectStatement.java:1226) ~[main/:na]
>         at org.apache.cassandra.cql3.statements.SelectStatement.processResults(SelectStatement.java:299) ~[main/:na]
>         at org.apache.cassandra.cql3.statements.SelectStatement.execute(SelectStatement.java:238) ~[main/:na]
>         at org.apache.cassandra.cql3.statements.SelectStatement.execute(SelectStatement.java:67) ~[main/:na]
>         at org.apache.cassandra.cql3.QueryProcessor.processStatement(QueryProcessor.java:238) ~[main/:na]
>         at org.apache.cassandra.cql3.QueryProcessor.process(QueryProcessor.java:260) ~[main/:na]
>         at org.apache.cassandra.transport.messages.QueryMessage.execute(QueryMessage.java:119) ~[main/:na]
>         at org.apache.cassandra.transport.Message$Dispatcher.channelRead0(Message.java:439) [main/:na]
>         at org.apache.cassandra.transport.Message$Dispatcher.channelRead0(Message.java:335) [main/:na]
>         at io.netty.channel.SimpleChannelInboundHandler.channelRead(SimpleChannelInboundHandler.java:105) [netty-all-4.0.23.Final.jar:4.0.23.Final]
>         at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:333) [netty-all-4.0.23.Final.jar:4.0.23.Final]
>         at io.netty.channel.AbstractChannelHandlerContext.access$700(AbstractChannelHandlerContext.java:32) [netty-all-4.0.23.Final.jar:4.0.23.Final]
>         at io.netty.channel.AbstractChannelHandlerContext$8.run(AbstractChannelHandlerContext.java:324) [netty-all-4.0.23.Final.jar:4.0.23.Final]
>         at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) [na:1.8.0_45]
>         at org.apache.cassandra.concurrent.AbstractTracingAwareExecutorService$FutureTask.run(AbstractTracingAwareExecutorService.java:164) [main/:na]
>         at org.apache.cassandra.concurrent.SEPWorker.run(SEPWorker.java:105) [main/:na]
>         at java.lang.Thread.run(Thread.java:745) [na:1.8.0_45]
> {code}
> This issue also presents on the head of the 2.2 branch and on 2.0.16. However, the prior behaviour is different on both of those branches.
> In the 2.0 line prior to CASSANDRA-9532, duplicate columns would actually be included in the results, as opposed to being silently dropped as per 2.1.x
> In 2.2, the assertion error seen above precedes CASSANDRA-9532 and is also triggered for both aliased and unaliased duplicate columns.



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