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_ -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: issues-unsubscr...@arrow.apache.org.apache.org For queries about this service, please contact Infrastructure at: us...@infra.apache.org