If index sorted by decimal field but sorted as a text

[maqdev]

ERR 19:55:35.875 e.workers.secondary.SecondaryWorker Can't execute IndexContentTask(1472752595776,IndexDefTransaction(col-bench-test~,index2,48c7ab10-706d-11e6-aed4-5de7787be5fb),None,0) 
com.datastax.driver.core.exceptions.InvalidTypeException: Value t0 is of type varchar
    at com.datastax.driver.core.AbstractGettableByIndexData.checkType(AbstractGettableByIndexData.java:75) ~[cassandra-driver-core-2.1.9.jar:na]
    at com.datastax.driver.core.AbstractData.setDecimal(AbstractData.java:227) ~[cassandra-driver-core-2.1.9.jar:na]
    at com.datastax.driver.core.BoundStatement.setDecimal(BoundStatement.java:659) ~[cassandra-driver-core-2.1.9.jar:na]
    at eu.inn.hyperstorage.db.Db$$anonfun$insertIndexItem$1.apply(Db.scala:302) ~[classes/:na]
    at eu.inn.hyperstorage.db.Db$$anonfun$insertIndexItem$1.apply(Db.scala:300) ~[classes/:na]
    at scala.collection.immutable.List.foreach(List.scala:381) ~[scala-library-2.11.8.jar:na]
    at eu.inn.hyperstorage.db.Db.insertIndexItem(Db.scala:300) ~[classes/:na]
    at eu.inn.hyperstorage.workers.secondary.IndexContentTaskWorker$class.indexItem(IndexContentTaskWorker.scala:135) ~[classes/:na]
    at eu.inn.hyperstorage.workers.secondary.SecondaryWorker.indexItem(SecondaryWorker.scala:26) ~[classes/:na]
    at eu.inn.hyperstorage.workers.secondary.IndexContentTaskWorker$$anonfun$indexNextBucket$1$$anonfun$apply$2$$anonfun$apply$3.apply(IndexContentTaskWorker.scala:46) ~[classes/:na]
    at eu.inn.hyperstorage.workers.secondary.IndexContentTaskWorker$$anonfun$indexNextBucket$1$$anonfun$apply$2$$anonfun$apply$3.apply(IndexContentTaskWorker.scala:45) ~[classes/:na]
    at eu.inn.hyperstorage.utils.FutureUtils$$anonfun$serial$1$$anonfun$apply$1.apply(FutureUtils.scala:30) ~[classes/:na]
    at eu.inn.hyperstorage.utils.FutureUtils$$anonfun$serial$1$$anonfun$apply$1.apply(FutureUtils.scala:30) ~[classes/:na]
    at scala.concurrent.Future$$anonfun$flatMap$1.apply(Future.scala:253) ~[scala-library-2.11.8.jar:na]
    at scala.concurrent.Future$$anonfun$flatMap$1.apply(Future.scala:251) ~[scala-library-2.11.8.jar:na]
    at scala.concurrent.impl.CallbackRunnable.run(Promise.scala:32) ~[scala-library-2.11.8.jar:na]
    at akka.dispatch.BatchingExecutor$AbstractBatch.processBatch(BatchingExecutor.scala:55) ~[akka-actor_2.11-2.4.1.jar:na]
    at akka.dispatch.BatchingExecutor$BlockableBatch$$anonfun$run$1.apply$mcV$sp(BatchingExecutor.scala:91) ~[akka-actor_2.11-2.4.1.jar:na]
    at akka.dispatch.BatchingExecutor$BlockableBatch$$anonfun$run$1.apply(BatchingExecutor.scala:91) ~[akka-actor_2.11-2.4.1.jar:na]
    at akka.dispatch.BatchingExecutor$BlockableBatch$$anonfun$run$1.apply(BatchingExecutor.scala:91) ~[akka-actor_2.11-2.4.1.jar:na]
    at scala.concurrent.BlockContext$.withBlockContext(BlockContext.scala:72) ~[scala-library-2.11.8.jar:na]
    at akka.dispatch.BatchingExecutor$BlockableBatch.run(BatchingExecutor.scala:90) ~[akka-actor_2.11-2.4.1.jar:na]
    at akka.dispatch.TaskInvocation.run(AbstractDispatcher.scala:39) ~[akka-actor_2.11-2.4.1.jar:na]
    at akka.dispatch.ForkJoinExecutorConfigurator$AkkaForkJoinTask.exec(AbstractDispatcher.scala:399) ~[akka-actor_2.11-2.4.1.jar:na]
    at scala.concurrent.forkjoin.ForkJoinTask.doExec(ForkJoinTask.java:260) [scala-library-2.11.8.jar:na]
    at scala.concurrent.forkjoin.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:1339) [scala-library-2.11.8.jar:na]
    at scala.concurrent.forkjoin.ForkJoinPool.runWorker(ForkJoinPool.java:1979) [scala-library-2.11.8.jar:na]
    at scala.concurrent.forkjoin.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:107) [scala-library-2.11.8.jar:na]