SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 3)
   ExpressionList (children 1)
    Literal UInt64_1
   TablesInSelectQuery (children 2)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      Function cluster (alias T1) (children 1)
       ExpressionList (children 2)
        Literal \'test_shard_localhost\'
        Identifier system.columns
    TablesInSelectQueryElement (children 2)
     TableExpression (children 1)
      Function cluster (alias T2) (children 1)
       ExpressionList (children 2)
        Literal \'test_shard_localhost\'
        Identifier system.tables
     TableJoin (children 1)
      Function equals (children 1)
       ExpressionList (children 2)
        Identifier T1.table
        Identifier T2.name
   Literal UInt64_1
