How to limit the result of groupby accum

GSQL
1

Hi,
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This is my query…I want count in descending order and also limit the result like top3

Thank you

2

So for this specific example, you dont actually need a group by accum - but we can look at a few variations

  1. just use a MapAccum - this prints out all the cities and their counts
MapAccum<STRING, INT> @@cityCount:

res = SELECT tgt FROM start:s -(reverse_edge_type_1) - Person:tgt 
        ACCUM @@cityCount += (tgt.City ->1);
print @@cityCount;
  1. HeapAccum to limit the size of the output, where lim is an input INT argument
TYPEDEF tuple<STRING cityName,  INT cnt> cityCnts;

HeapAccum<cityCnts>(lim, cnt DESC) @@mainCityCount;
MapAccum<STRING, INT> @@cityCount:

res = SELECT tgt FROM start:s -(reverse_edge_type_1) - Person:tgt 
        ACCUM @@cityCount += (tgt.City ->1)
        POST-ACCUM 
            FOREACH (x,y) IN @@cityCount
                    @@mainCityCount +=  cityCnts(x,y)
            END
print @@mainCityCount;
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