I am trying to use the siddhi query langage but it seems I am misusing it.

I have some events with the following streamdef :

```
{  'name':'eu.ima.stat.events',  'version':'1.1.0',  'nickName': 'Flux event Information',  'description': 'Details of Analytics Statistics',  'metaData':[          {name:'HostIP','type':'STRING'}  ],  'correlationData':[          {name:'ProcessType','type':'STRING'},          {name:'Flux','type':'STRING'},          {name:'ReferenceId','type':'STRING'}  ],  'payloadData':[          {'name':'Timestamp','type':'STRING'},          {'name':'EventCode','type':'STRING'},          {'name':'Type','type':'STRING'},          {'name':'EventInfo','type':'STRING'}  ]}

```

I am just trying to filter events with the same processus value and the same flux value using a query like this one :

```
from myEventStream[processus == 'SomeName' and flux == 'someOtherName' ]
insert into someStream
processus, flux, timestamp

```

Whenever I try this, no output is generated. When I get rid of the filter 

```
from myEventStream
insert into someStream
processus, flux, timestamp

```

all my events are ther in the output.

What's wrong with my query ?