SiddhiQL查询错误：输入'group'不匹配

Question

I am using a simple SiddhiQL query to get number of records having same timestamp till minute entry and these timestamps. The query is:

from inputStream
select time:dateFormat(ts,'yyyy-MM-dd HH:mm') as formatedTs, count(formatedTs)
group by formatedTs
insert into outputStream;

It gives me the error mismatched input 'group' expecting {'*', '+', '-', '/', '%', '<', '<=', '>', '>=', '==', '!=', AS, OR, AND, IN} . What's wrong with group by clause in this context?

Answer 1

Reason for the error:

This particular error is coming due to the missing AS , following count(formatedTs)

(This is indicated in the error message as well. mismatched input 'group' expecting {'*', '+', '-', '/', '%', '<', '<=', '>', '>=', '==', '!=', AS, OR, AND, IN} Query Compiler thinks group is in wrong place due to the missing AS )

Correction needed:

So the select statement, needs to be corrected as below:

select time:dateFormat(ts,'yyyy-MM-dd HH:mm') as formatedTs, count(formatedTs) as tsCount

Further correction which you might need:

Also, does the inputStream has an attribute named formatedTs ? If not, after fixing the select statement, you'll get another error like below:

Cannot find attribute type as 'formatedTs' does not exist in 'inputStream'

because the attribute for which you are taking the count should exist in the inputStream

If that is the case, following query (which should compile successfully) might help you:

from inputStream
select time:dateFormat(ts,'yyyy-MM-dd HH:mm') as formatedTs, count(ts) as countTs
group by ts
insert into outputStream;

Update

Updating the query since your requirement is to group by the formatted timestamp:

from inputStream
select time:dateFormat(ts,'yyyy-MM-dd HH:mm') as formatedTs
insert into innerStream;

from innerStream
select formatedTs, count(formatedTs) as countTs
group by formatedTs
insert into outStream;