SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 3)
   ExpressionList (children 1)
    Asterisk
   TablesInSelectQuery (children 2)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      TableIdentifier tab (alias l)
    TablesInSelectQueryElement (children 2)
     TableExpression (children 1)
      TableIdentifier tab (alias r)
     TableJoin
   Function and (children 1)
    ExpressionList (children 2)
     Function less (children 1)
      ExpressionList (children 2)
       Identifier l.x
       Identifier r.x
     Function less (children 1)
      ExpressionList (children 2)
       Identifier r.x
       Literal UInt64_2
