SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 3)
   ExpressionList (children 2)
    Function SUM (children 1)
     ExpressionList (children 1)
      Identifier value
    Function COUNT (children 1)
     ExpressionList (children 1)
      Asterisk
   TablesInSelectQuery (children 2)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      TableIdentifier skewed_probe
    TablesInSelectQueryElement (children 2)
     TableExpression (children 1)
      TableIdentifier build
     TableJoin (children 1)
      ExpressionList (children 2)
       Identifier key
       Identifier begin
   Set
