klin333 opened a new issue, #2684:
URL: https://github.com/apache/arrow-adbc/issues/2684
### What happened?
When reading from an empty snowflake table (ie with 0 rows), BOOLEAN columns
are read in to R data.frame as character() columns.
The write_adbc correctly created the table. On Snowflake, I see the table is
made using this sql query.
```
create or replace TABLE EXAMPLE_DB.EXAMPLE_SCHEMA."empty" (
"x" BOOLEAN
);
```
```{r}
library(adbcdrivermanager)
uri <- "secret"
db <- adbc_database_init(adbcsnowflake::adbcsnowflake(), uri = uri)
snowflake_con <- adbc_connection_init(db)
df <- data.frame(x = logical(1))
write_adbc(df, snowflake_con, "non_empty", mode = "create")
df_read <- read_adbc(snowflake_con, 'SELECT * from "non_empty"') |>
as.data.frame()
str(df_read)
#'data.frame': 1 obs. of 1 variable:
# $ x: logi FALSE
df <- data.frame(x = logical(0))
write_adbc(df, snowflake_con, "empty", mode = "create")
df_read <- read_adbc(snowflake_con, 'SELECT * from "empty"') |>
as.data.frame()
str(df_read)
#'data.frame': 0 obs. of 1 variable:
# $ x: chr
```
sessionInfo():
```
R version 4.3.2 (2023-10-31 ucrt)
Platform: x86_64-w64-mingw32/x64 (64-bit)
Running under: Windows 11 x64 (build 22631)
Matrix products: default
locale:
[1] LC_COLLATE=English_Australia.utf8 LC_CTYPE=English_Australia.utf8
LC_MONETARY=English_Australia.utf8 LC_NUMERIC=C
[5] LC_TIME=English_Australia.utf8
time zone: Australia/Sydney
tzcode source: internal
attached base packages:
[1] graphics grDevices utils methods base
other attached packages:
[1] adbcdrivermanager_0.17.0
loaded via a namespace (and not attached):
[1] compiler_4.3.2 tools_4.3.2 rstudioapi_0.16.0
adbcsnowflake_0.17.0 stats_4.3.2 nanoarrow_0.6.0 renv_1.0.3
```
### Stack Trace
_No response_
### How can we reproduce the bug?
_No response_
### Environment/Setup
_No response_
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