So it will become:
select(
search(..),
conceptid as foo,
       storeid as bar
      append(conceptid, storeid) as id
)

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

> On Jun 27, 2018, at 1:12 PM, Aroop Ganguly <aroopgang...@icloud.com> wrote:
> 
> this test case here will help in understanding the usage:
> https://github.com/apache/lucene-solr/blob/branch_7_2/solr/solrj/src/test/org/apache/solr/client/solrj/io/stream/eval/AppendEvaluatorTest.java
>  
> <https://github.com/apache/lucene-solr/blob/branch_7_2/solr/solrj/src/test/org/apache/solr/client/solrj/io/stream/eval/AppendEvaluatorTest.java>
> 
>> On Jun 27, 2018, at 1:07 PM, Aroop Ganguly <aroopgang...@icloud.com> wrote:
>> 
>> I think u can use the append evaluator
>> https://github.com/apache/lucene-solr/blob/master/solr/solrj/src/java/org/apache/solr/client/solrj/io/eval/AppendEvaluator.java
>>  
>> <https://github.com/apache/lucene-solr/blob/master/solr/solrj/src/java/org/apache/solr/client/solrj/io/eval/AppendEvaluator.java>
>> 
>> 
>>> On Jun 27, 2018, at 12:58 PM, Pratik Patel <pra...@semandex.net> wrote:
>>> 
>>> 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
>> 
> 

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