Explain EXPLAIN (children 2)
 Set
 SelectWithUnionQuery (children 1)
  ExpressionList (children 1)
   SelectQuery (children 4)
    ExpressionList (children 1)
     Asterisk
    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 notEquals (children 1)
     ExpressionList (children 2)
      Identifier rhs.id
      Literal UInt64_0
    Set
