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Date: Mon, 3 Apr 2017 08:57:41 +0000 (UTC)
From: "Benjamin Lerer (JIRA)" <jira@apache.org>
To: commits@cassandra.apache.org
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Subject: [jira] [Updated] (CASSANDRA-13399) UDA fails without input rows
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archived-at: Mon, 03 Apr 2017 08:57:47 -0000


     [ https://issues.apache.org/jira/browse/CASSANDRA-13399?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Benjamin Lerer updated CASSANDRA-13399:
---------------------------------------
    Reviewer: Benjamin Lerer

> UDA fails without input rows
> ----------------------------
>
>                 Key: CASSANDRA-13399
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-13399
>             Project: Cassandra
>          Issue Type: Bug
>          Components: CQL
>            Reporter: PAF
>            Assignee: Robert Stupp
>            Priority: Minor
>             Fix For: 3.11.x
>
>
> When creating the following user defined AGGREGATION and FUNCTION:
> {code:title=init.cql|borderStyle=solid}
> CREATE FUNCTION state_group_and_total(state map<uuid, int>, type uuid)
>     RETURNS NULL ON NULL INPUT
>     RETURNS map<uuid, int>
>     LANGUAGE java AS '
>         Integer count = (Integer) state.get(type);
>         count = (count == null ? 1 : count + 1);
>         state.put(type, count);
>         return state;
>     ';
> CREATE OR REPLACE AGGREGATE group_and_total(uuid)
>     SFUNC state_group_and_total
>     STYPE map<uuid, int>
>     INITCOND {};
> {code}
> And creating a statement like:
> {code}
> SELECT group_and_total("id") FROM mytable;
> {code}
> When mytable is empty, it throws the following null assertion
> {code}
> ERROR [Native-Transport-Requests-1] 2017-04-03 07:25:09,787 Message.java:623 - Unexpected exception during request; channel = [id: 0xd7d9159b, L:/172.19.0.2:9042 - R:/172.19.0.3:43444]
> java.lang.AssertionError: null
>         at org.apache.cassandra.cql3.functions.UDAggregate$2.compute(UDAggregate.java:189) ~[apache-cassandra-3.10.jar:3.10]
>         at org.apache.cassandra.cql3.selection.AggregateFunctionSelector.getOutput(AggregateFunctionSelector.java:53) ~[apache-cassandra-3.10.jar:3.10]
>         at org.apache.cassandra.cql3.selection.Selection$SelectionWithProcessing$1.getOutputRow(Selection.java:592) ~[apache-cassandra-3.10.jar:3.10]
>         at org.apache.cassandra.cql3.selection.Selection$ResultSetBuilder.getOutputRow(Selection.java:430) ~[apache-cassandra-3.10.jar:3.10]
>         at org.apache.cassandra.cql3.selection.Selection$ResultSetBuilder.build(Selection.java:424) ~[apache-cassandra-3.10.jar:3.10]
>         at org.apache.cassandra.cql3.statements.SelectStatement.process(SelectStatement.java:763) ~[apache-cassandra-3.10.jar:3.10]
>         at org.apache.cassandra.cql3.statements.SelectStatement.processResults(SelectStatement.java:400) ~[apache-cassandra-3.10.jar:3.10]
>         at org.apache.cassandra.cql3.statements.SelectStatement.execute(SelectStatement.java:378) ~[apache-cassandra-3.10.jar:3.10]
>         at org.apache.cassandra.cql3.statements.SelectStatement.execute(SelectStatement.java:251) ~[apache-cassandra-3.10.jar:3.10]
>         at org.apache.cassandra.cql3.statements.SelectStatement.execute(SelectStatement.java:79) ~[apache-cassandra-3.10.jar:3.10]
>         at org.apache.cassandra.cql3.QueryProcessor.processStatement(QueryProcessor.java:217) ~[apache-cassandra-3.10.jar:3.10]
>         at org.apache.cassandra.cql3.QueryProcessor.process(QueryProcessor.java:248) ~[apache-cassandra-3.10.jar:3.10]
>         at org.apache.cassandra.cql3.QueryProcessor.process(QueryProcessor.java:233) ~[apache-cassandra-3.10.jar:3.10]
>         at org.apache.cassandra.transport.messages.QueryMessage.execute(QueryMessage.java:116) ~[apache-cassandra-3.10.jar:3.10]
>         at org.apache.cassandra.transport.Message$Dispatcher.channelRead0(Message.java:517) [apache-cassandra-3.10.jar:3.10]
>         at org.apache.cassandra.transport.Message$Dispatcher.channelRead0(Message.java:410) [apache-cassandra-3.10.jar:3.10]
>         at io.netty.channel.SimpleChannelInboundHandler.channelRead(SimpleChannelInboundHandler.java:105) [netty-all-4.0.39.Final.jar:4.0.39.Final]
>         at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:366) [netty-all-4.0.39.Final.jar:4.0.39.Final]
>         at io.netty.channel.AbstractChannelHandlerContext.access$600(AbstractChannelHandlerContext.java:35) [netty-all-4.0.39.Final.jar:4.0.39.Final]
>         at io.netty.channel.AbstractChannelHandlerContext$7.run(AbstractChannelHandlerContext.java:357) [netty-all-4.0.39.Final.jar:4.0.39.Final]
>         at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) [na:1.8.0_121]
>         at org.apache.cassandra.concurrent.AbstractLocalAwareExecutorService$FutureTask.run(AbstractLocalAwareExecutorService.java:162) [apache-cassandra-3.10.jar:3.10]
>         at org.apache.cassandra.concurrent.SEPWorker.run(SEPWorker.java:109) [apache-cassandra-3.10.jar:3.10]
>         at java.lang.Thread.run(Thread.java:745) [na:1.8.0_121]
> {code}
> Even if my FUNCTION only returns state, it creates that assertion null.
> Thank you in advance.


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