SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 6)
   ExpressionList (children 1)
    Asterisk
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      TableIdentifier tab
   Function in (children 1)
    ExpressionList (children 2)
     Identifier x
     Identifier set
   Function in (children 1)
    ExpressionList (children 2)
     Identifier x
     Identifier set
   Literal UInt64_1
   Set