anchor.diff:  include::../test/org/apache/groovy/ginq/GinqTest.groovy[tags=ginq_aggfunction_02,indent=0]
   ----
   
  +////
   [source, groovy]
   ----
   include::../test/org/apache/groovy/ginq/GinqTest.groovy[tags=ginq_aggfunction_01,indent=0]
   ----
  +////
   
   [source, groovy]
   ----
  
positive.code: include::../test/org/apache/groovy/ginq/GinqTest.groovy[tags=ginq_grouping_12,indent=0]
  ----
  
  [source, sql]
  ----
  include::../test/org/apache/groovy/ginq/GinqTest.groovy[tags=ginq_grouping_03,indent=0]
  
negative.code: |java.math.BigDecimal
  |the statistical variance for the population for all non-null values
  
  //|agg(_expression_)
  //|any
  //|any
  //|customizes the aggregation logic in _expression_ and returns single value
  
  |===
  
  