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top_n() causes syntax error in sqlite #907

cpsievert opened this issue Jan 19, 2015 · 1 comment

top_n() causes syntax error in sqlite #907

cpsievert opened this issue Jan 19, 2015 · 1 comment


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@cpsievert cpsievert commented Jan 19, 2015

tmp <- tempfile(fileext = ".sqlite3")
db <- src_sqlite(tmp, create = TRUE)
copy_to(db, mtcars, "mt_cars")
mt_cars <- tbl(db, "mt_cars") %>% top_n(20)

#> Error in sqliteSendQuery(con, statement, : 
#>  error in statement: near "DESC": syntax error

This error seems to be the result of a bad WHERE clause

#> <Query> SELECT "mpg", "cyl", "disp", "hp", "drat", "wt", "qsec", "vs", "am", "gear", "carb"
#> FROM "mt_cars"
#> WHERE MIN_RANK("carb" DESC) <= 20.0
#> <SQLiteConnection>
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@hadley hadley commented Jan 20, 2015

Hmmmm, top_n() can't work with sqlite as currently written (and I don't know if it's possible at all using SQLite SQL), but it should throw an error.

@hadley hadley added this to the 0.5 milestone May 19, 2015
@hadley hadley closed this in 5503d91 Mar 7, 2016
@lock lock bot locked as resolved and limited conversation to collaborators Jun 9, 2018
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