Two joins in a row fail

[Liudvikas-vinted]

To reproduce:

TABLE <- tbl(impala, "default.test")

## The following works
TABLE %>%
  left_join(TABLE) 

## The following chokes the Impala engine 
TABLE %>%
  left_join(TABLE) %>%
  left_join(TABLE) 

## Because
TABLE %>%
  left_join(TABLE) %>%
  left_join(TABLE) %>%
  show_query()

> <SQL>
> SELECT `default`.`test`.``.``.`1`.*
> FROM `default`.`test` AS `default`.`test`.``.``.`1`
> LEFT JOIN `default`.`test` AS `default`.`test`.``.``.`2`
>   ON (
>     `default`.`test`.``.``.`1`.`x` = `default`.`test`.``.``.`2`.`x` AND
>     `default`.`test`.``.``.`1`.`y` = `default`.`test`.``.``.`2`.`y`
>   )
> LEFT JOIN `default`.`test` AS `default`.`test`.``.``.`3`
>  ON (
>     `default`.`test`.``.``.`1`.`x` = `default`.`test`.``.``.`3`.`x` AND
>     `default`.`test`.``.``.`1`.`y` = `default`.`test`.``.``.`3`.`y`
>   )

Notice how generated query contains empty identifiers in backticks. Buggy behaviou doesn't happen when TABLE is backed by SQLite, for example, so this is likely specific to implyr.

R version 4.1.2 (2021-11-01)
Platform: x86_64-pc-linux-gnu (64-bit)
Running under: Ubuntu 22.04.2 LTS

dbplyr_2.3.2
implyr_0.4.0