Explain EXPLAIN (children 1)
 SelectWithUnionQuery (children 1)
  ExpressionList (children 1)
   SelectQuery (children 3)
    ExpressionList (children 2)
     Identifier x
     Identifier z
    TablesInSelectQuery (children 1)
     TablesInSelectQueryElement (children 1)
      TableExpression (children 1)
       TableIdentifier tab
    Function and (children 1)
     ExpressionList (children 2)
      Function in (children 1)
       ExpressionList (children 2)
        Identifier x
        Literal Tuple_(UInt64_1, UInt64_2)
      Function less (children 1)
       ExpressionList (children 2)
        Identifier z
        Literal UInt64_5
