SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 2)
   ExpressionList (children 3)
    Function finalizeAggregation (children 1)
     ExpressionList (children 1)
      Function uniqThetaUnion (children 1)
       ExpressionList (children 2)
        Identifier a
        Identifier b
    Function finalizeAggregation (children 1)
     ExpressionList (children 1)
      Identifier a
    Function finalizeAggregation (children 1)
     ExpressionList (children 1)
      Identifier b
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      Subquery (children 1)
       SelectWithUnionQuery (children 1)
        ExpressionList (children 1)
         SelectQuery (children 1)
          ExpressionList (children 2)
           Function arrayReduce (alias a) (children 1)
            ExpressionList (children 2)
             Literal \'uniqThetaState\'
             Literal Array_[UInt64_1, UInt64_2]
           Function arrayReduce (alias b) (children 1)
            ExpressionList (children 2)
             Literal \'uniqThetaState\'
             Literal Array_[UInt64_2, UInt64_3, UInt64_4]
