SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 2)
   ExpressionList (children 6)
    Function avg (children 1)
     ExpressionList (children 1)
      Identifier key
    Function avgIf (children 1)
     ExpressionList (children 2)
      Identifier key
      Function greater (children 1)
       ExpressionList (children 2)
        Identifier key
        Literal UInt64_0
    Function avg (children 1)
     ExpressionList (children 1)
      Identifier key2
    Function avgIf (children 1)
     ExpressionList (children 2)
      Identifier key2
      Function greater (children 1)
       ExpressionList (children 2)
        Identifier key2
        Literal UInt64_0
    Function avg (children 1)
     ExpressionList (children 1)
      Identifier key3
    Function avgIf (children 1)
     ExpressionList (children 2)
      Identifier key3
      Function greater (children 1)
       ExpressionList (children 2)
        Identifier key3
        Literal UInt64_0
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      Subquery (children 1)
       SelectWithUnionQuery (children 1)
        ExpressionList (children 1)
         SelectQuery (children 2)
          ExpressionList (children 3)
           Function CAST (alias key) (children 1)
            ExpressionList (children 2)
             Literal \'1\'
             Literal \'Int8\'
           Function CAST (alias key2) (children 1)
            ExpressionList (children 2)
             Literal NULL
             Literal \'Nullable(Int8)\'
           Function CAST (alias key3) (children 1)
            ExpressionList (children 2)
             Literal \'1\'
             Literal \'Nullable(Int8)\'
          TablesInSelectQuery (children 1)
           TablesInSelectQueryElement (children 1)
            TableExpression (children 1)
             Function numbers (children 1)
              ExpressionList (children 1)
               Literal UInt64_100000