Fix compatibility with ClickHouse without allow_experimental_analyzer=1

[azat]

ClickHouse without allow_experimental_analyzer returns name of the subquery with the key when you have > 2 subqueries (odd):

This is for 21.2:

select a.*, b.*, c.* from (select * from system.one) as a, (select dummy as x from system.one) as b, (select dummy as y from system.one) as c
┌─a.dummy─┬─b.x─┬─c.y─┐
│       0 │   0 │   0 │
└─────────┴─────┴─────┘

select a.*, b.* from (select * from system.one) as a, (select dummy as x from system.one) as b
┌─dummy─┬─x─┐
│     0 │ 0 │
└───────┴───┘

24.7 upstream:

select a.*, b.*, c.* from (select * from system.one) as a, (select dummy as x from system.one) as b, (select dummy as y from system.one) as c
┌─a.dummy─┬─b.x─┬─c.y─┐
│       0 │   0 │   0 │
└─────────┴─────┴─────┘

select a.*, b.*, c.* from (select * from system.one) as a, (select dummy as x from system.one) as b, (select dummy as y from system.one) as c settings allow_experimental_analyzer=0
┌─a.dummy─┬─b.x─┬─c.y─┐
│       0 │   0 │   0 │
└─────────┴─────┴─────┘

Fixes: 5e0d54b ("Add Inserted/Selected rows into summary")