SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 4)
   ExpressionList (children 1)
    Function count (children 1)
     ExpressionList
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      TableIdentifier t
   Function not (children 1)
    ExpressionList (children 1)
     Function ignore (children 1)
      ExpressionList (children 1)
       Identifier a
   Function greater (children 1)
    ExpressionList (children 2)
     Identifier b
     Literal UInt64_0
