Explain leads to bad value error

[mgirlich]

Found when running the dbplyr tests. This was introduced with v1.3.0 and still happens in the dev version.

Edit: Sorry, didn't check the reprex again when running it the second time.
The issue only seems to appear when I connect to an SQLite db before 😕

con_sqlite <- DBI::dbConnect(
  RSQLite::SQLite(), ":memory:"
)
con <- DBI::dbConnect(
  RMariaDB::MariaDB(),
  dbname = "test",
  host = "localhost",
  username = Sys.getenv("USER")
)

DBI::dbWriteTable(con, "test", data.frame(x = 1:3))
DBI::dbGetQuery(
  con,
  "EXPLAIN SELECT `test`.*, `x` + 1.0 AS `y` FROM `test`"
)
#> Error in result_fetch(res@ptr, n = n): bad value

^{Created on 2023-10-27 with reprex v2.0.2}

[krlmlr]

Thanks. What is the expected behavior here?

[mgirlich]

Argh, sorry, I ran the reprex again and didn't check that it didn't contain the issue anymore. This only seems to happen when connection to SQLite before. Interesting.

[krlmlr]

Works for me:

pkgload::load_all()
#> ℹ Loading RMariaDB
#> ! Skipping missing files: '/root/workspace/R/names.R'

con_sqlite <- DBI::dbConnect(
  RSQLite::SQLite(), ":memory:"
)
con <- DBI::dbConnect(
  RMariaDB::MariaDB()
)

DBI::dbWriteTable(con, "test", data.frame(x = 1:3), overwrite = TRUE)
DBI::dbGetQuery(
  con,
  "EXPLAIN SELECT `test`.*, `x` + 1.0 AS `y` FROM `test`"
)
#>   id select_type table type possible_keys  key key_len  ref rows Extra
#> 1  1      SIMPLE  test  ALL          <NA> <NA>    <NA> <NA>    3

^{Created on 2024-04-01 with reprex v2.1.0}

Can you please double-check in your setup?

[mgirlich]

Seems to be fixed now 👍