String concatenation in Streaming Expressions

[Pratik Patel]

Hello,

Is there a function which can be used in Streaming Expressions to
concatenate two strings? I want to use it just like add(1,2) in a Streaming
Expression. Essentially, I want to achieve something as follows.

select(
search(..),
conceptid as foo,
        storeid as bar
        concat(foo,bar) as id
)

I can use merge() function but my streaming expression is quite complex and
that will make it even more complex as that would be a round about way of
doing it. Any idea how this can be achieved?

Thanks,
Pratik