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https://issues.apache.org/jira/browse/CASSANDRA-8451?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Tyler Hobbs updated CASSANDRA-8451:
-----------------------------------
Attachment: 8451-2.0.txt
The problem was that we were using an {{instanceof WritetimeOrTTLSelector}}
check on selectors to see if timestamps or ttls needed to be collected. The
attached patch fixes that, and [I added a
dtest|https://github.com/thobbs/cassandra-dtest/tree/CASSANDRA-8451] as well.
> NPE when writetime() or ttl() are nested inside function call
> -------------------------------------------------------------
>
> Key: CASSANDRA-8451
> URL: https://issues.apache.org/jira/browse/CASSANDRA-8451
> Project: Cassandra
> Issue Type: Bug
> Components: Core
> Reporter: Tyler Hobbs
> Assignee: Tyler Hobbs
> Priority: Minor
> Fix For: 2.0.12, 2.1.3
>
> Attachments: 8451-2.0.txt
>
>
> When the {{writetime()}} or {{ttl()}} functions are nested inside another
> function, the query will result in a NullPointerException:
> {noformat}
> cqlsh> select bigintAsBlob(writetime(durable_writes)) from
> system.schema_keyspaces;
> <ErrorMessage code=0000 [Server error]
> message="java.lang.NullPointerException">
> {noformat}
> Here's the stacktrace:
> {noformat}
> ERROR 00:14:56 Unexpected exception during request
> java.lang.NullPointerException: null
> at
> org.apache.cassandra.cql3.statements.Selection$WritetimeOrTTLSelector.compute(Selection.java:538)
> ~[main/:na]
> at
> org.apache.cassandra.cql3.statements.Selection$FunctionSelector.compute(Selection.java:462)
> ~[main/:na]
> at
> org.apache.cassandra.cql3.statements.Selection$SelectionWithProcessing.handleRow(Selection.java:434)
> ~[main/:na]
> at
> org.apache.cassandra.cql3.statements.Selection$ResultSetBuilder.newRow(Selection.java:331)
> ~[main/:na]
> at
> org.apache.cassandra.cql3.statements.SelectStatement.processColumnFamily(SelectStatement.java:1243)
> ~[main/:na]
> at
> org.apache.cassandra.cql3.statements.SelectStatement.process(SelectStatement.java:1177)
> ~[main/:na]
> at
> org.apache.cassandra.cql3.statements.SelectStatement.processResults(SelectStatement.java:274)
> ~[main/:na]
> at
> org.apache.cassandra.cql3.statements.SelectStatement.execute(SelectStatement.java:213)
> ~[main/:na]
> at
> org.apache.cassandra.cql3.statements.SelectStatement.execute(SelectStatement.java:62)
> ~[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:471)
> [na:1.7.0_40]
> 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:724) [na:1.7.0_40]
> {noformat}
> Basically, it's failing to collect timestamps (or TTLs) when the function is
> wrapped. A similar query that additionally selects {{writetime()}} directly
> will succeed (because the timestamps will get collected):
> {noformat}
> cqlsh> select bigintAsBlob(writetime(durable_writes)),
> writetime(durable_writes) from system.schema_keyspaces ;
> bigintAsBlob(writetime(durable_writes)) | writetime(durable_writes)
> -----------------------------------------+---------------------------
> 0x000509d1865c67f9 | 1418170390571001
> 0x0000000000000000 | 0
> {noformat}
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