'exists' and 'not' can only have a single child beneath it. use 'and'/'or' to nested multiple CEs.

Mark
Olenin, Vladimir (MOH) wrote:

Hi,

I’ve run across one thing. If I evaluate two columns within ‘exists’ statement it throws compilation error if I don’t connect two columns with ‘and’:

Exists (

            Column (…)

            Column (…)

)

With ‘and’ everything compiles OK:

Exists (

            Column (…) and

            Column (…)

)

Which is correct? Or probably both are not correct? >From the 3.1M release notes I can suggest there is another syntax (which works as well):

Exists (

                        Column (…) and

            Exists Column (…)

)

I thought #1 should work OK…. I’m not sure what #2 might mean for DROOLS. From the rules & data I’m processing and results I’m getting it seems like it works as #1 should, ie, checking existence of the tuple represented by the columns within the ‘exists’ block….

Thanks,

Vlad
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