hms::as_hms() function slow down the reading of slf files

[lizihao-anu]

This issue is linked to the modification of #77. hms::as_hms() function slow down the reading of slf files because the parquet format does not support hms::as_hms(). @Moohan found this issue and suggested a workaround like

slfhelper::read_slf_episode(
  "1920",
  col_select = !dplyr::starts_with("keytime"),
  as_data_frame = FALSE
)

We can see this Public-Health-Scotland/phslookups#9 for more technical details on how to achieve this feature.

[Moohan]

Hey, just wanted to be clear that the slowdown I noticed was when running something like:

library(slfhelper)
highland <- read_slf_episode("1920", partnerships = "S37000016")

The other issue and solution mentioned are separate and is basically how the tidyselect helper (which should work with arrow::read_parquet don't work as they're not being passed through properly.