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Apologies,
In your stream setup you need to define [x].
The easiest guide for you is to perhaps look at the demo.q file inside the /sample/ directory which hosts the streaming examples which come with dashboards. There are four streaming data sets which use [x]: book, book1Agg, book2Agg and stream. If you use them as a template to your streaming example you should be able to set [x] as a filter.
You can test these four examples in the dashboard by using an FX symbol like EUR/USD.
Hope this helps,
Declan