Explain EXPLAIN (children 2)
 Set
 SelectWithUnionQuery (children 1)
  ExpressionList (children 1)
   SelectQuery (children 4)
    ExpressionList (children 4)
     Identifier lhs.id
     Identifier rhs.id
     Identifier lhs.value
     Identifier rhs.value
    TablesInSelectQuery (children 2)
     TablesInSelectQueryElement (children 1)
      TableExpression (children 1)
       TableIdentifier test_table_1 (alias lhs)
     TablesInSelectQueryElement (children 2)
      TableExpression (children 1)
       TableIdentifier test_table_2 (alias rhs)
      TableJoin (children 1)
       Function equals (children 1)
        ExpressionList (children 2)
         Identifier lhs.id
         Identifier rhs.id
    Function equals (children 1)
     ExpressionList (children 2)
      Identifier rhs.id
      Literal UInt64_5
    Set
