SelectWithUnionQuery (children 2)
 ExpressionList (children 1)
  SelectQuery (children 4)
   ExpressionList (children 2)
    Function concat (alias name) (children 1)
     ExpressionList (children 2)
      Identifier database
      Identifier table
    Function count (children 1)
     ExpressionList
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      Function clusterAllReplicas (children 1)
       ExpressionList (children 2)
        Identifier test_shard_localhost
        Identifier system.tables
   Function equals (children 1)
    ExpressionList (children 2)
     Identifier database
     Function currentDatabase (children 1)
      ExpressionList
   ExpressionList (children 1)
    Identifier name
 Identifier Null
