SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 3)
   ExpressionList (children 1)
    Identifier value
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      TableIdentifier system.zookeeper
   Function and (children 1)
    ExpressionList (children 2)
     Function equals (children 1)
      ExpressionList (children 2)
       Identifier name
       Literal \'metadata\'
     Function equals (children 1)
      ExpressionList (children 2)
       Identifier path
       Function concat (children 1)
        ExpressionList (children 3)
         Literal \'/clickhouse/tables/\'
         Function currentDatabase (children 1)
          ExpressionList
         Literal \'/x\'
