Can create a table with DecimalType comparator but CQL explodes trying to 
actually use it.
------------------------------------------------------------------------------------------

                 Key: CASSANDRA-3421
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-3421
             Project: Cassandra
          Issue Type: Bug
          Components: Core
    Affects Versions: 1.0.0
            Reporter: Kelley Reynolds


CREATE KEYSPACE CassandraCQLTestKeyspace WITH 
strategy_class='org.apache.cassandra.locator.SimpleStrategy' AND 
strategy_options:replication_factor=1

USE CassandraCQLTestKeyspace

CREATE COLUMNFAMILY comparator_cf_decimal (id text PRIMARY KEY) WITH 
comparator='DecimalType'

INSERT INTO comparator_cf_decimal (id, 15.333) VALUES ('test', 'test')

# This leads to failure
SELECT 15.333 FROM comparator_cf_decimal WHERE id = 'test' 

ERROR 12:22:56,909 Internal error processing execute_cql_query
java.nio.BufferUnderflowException
        at java.nio.Buffer.nextGetIndex(Buffer.java:480)
        at java.nio.HeapByteBuffer.getInt(HeapByteBuffer.java:336)
        at 
org.apache.cassandra.cql.jdbc.JdbcDecimal.compose(JdbcDecimal.java:90)
        at 
org.apache.cassandra.db.marshal.DecimalType.compose(DecimalType.java:43)
        at 
org.apache.cassandra.db.marshal.DecimalType.compare(DecimalType.java:38)
        at 
org.apache.cassandra.db.marshal.DecimalType.compare(DecimalType.java:30)
        at java.util.TreeMap.getEntryUsingComparator(TreeMap.java:351)
        at java.util.TreeMap.getEntry(TreeMap.java:322)
        at java.util.TreeMap.get(TreeMap.java:255)
        at 
org.apache.cassandra.db.TreeMapBackedSortedColumns.getColumn(TreeMapBackedSortedColumns.java:138)
        at 
org.apache.cassandra.db.AbstractColumnContainer.getColumn(AbstractColumnContainer.java:128)
        at 
org.apache.cassandra.cql.QueryProcessor.process(QueryProcessor.java:627)
        at 
org.apache.cassandra.thrift.CassandraServer.execute_cql_query(CassandraServer.java:1236)
        at 
org.apache.cassandra.thrift.Cassandra$Processor$execute_cql_query.process(Cassandra.java:4072)
        at 
org.apache.cassandra.thrift.Cassandra$Processor.process(Cassandra.java:2889)
        at 
org.apache.cassandra.thrift.CustomTThreadPoolServer$WorkerProcess.run(CustomTThreadPoolServer.java:187)
        at 
java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
        at 
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
        at java.lang.Thread.run(Thread.java:680)


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