8000 Regression: reading multiple Parquet files · Issue #1015 · duckdb/duckdb-r · GitHub
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krlmlr opened this issue Jan 20, 2025 · 1 comment · Fixed by #1024
Closed

Regression: reading multiple Parquet files #1015

krlmlr opened this issue Jan 20, 2025 · 1 comment · Fixed by #1024

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@krlmlr
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krlmlr commented Jan 20, 2025

Introduced in c52bef5.

if (!file.exists("1.parquet")) {
  duckplyr::compute_parquet(data.frame(a = 1, b = 2), "1.parquet")
}
#> Loading duckplyr
#> # A duckplyr data frame: 2 variables
#>       a     b
#>   <dbl> <dbl>
#> 1     1     2
if (!file.exists("2.parquet")) {
  duckplyr::compute_parquet(data.frame(a = 2, b = 3), "2.parquet")
}
#> # A duckplyr data frame: 2 variables
#>       a     b
#>   <dbl> <dbl>
#> 1     2     3

urls <- c("1.parquet", "2.parquet")

con <- DBI::dbConnect(duckdb::duckdb())
duckdb:::rel_from_table_function(con, "read_parquet", list(list(urls)))
#> Error:
#> ! {"exception_type":"Invalid Input","exception_message":"Failed to cast value: Unimplemented type for cast (VARCHAR -> r_string)"}

Created on 2025-01-20 with reprex v2.1.1

duckdb 1.1.3-1

if (!file.exists("1.parquet")) {
  duckplyr::compute_parquet(data.frame(a = 1, b = 2), "1.parquet")
}
#> Loading duckplyr
#> # A duckplyr data frame: 2 variables
#>       a     b
#>   <dbl> <dbl>
#> 1     1     2
if (!file.exists("2.parquet")) {
  duckplyr::compute_parquet(data.frame(a = 2, b = 3), "2.parquet")
}
#> # A duckplyr data frame: 2 variables
#>       a     b
#>   <dbl> <dbl>
#> 1     2     3

urls <- c("1.parquet", "2.parquet")

con <- DBI::dbConnect(duckdb::duckdb())
duckdb:::rel_from_table_function(con, "read_parquet", list(list(urls)))
#> DuckDB Relation: 
#> ---------------------
#> --- Relation Tree ---
#> ---------------------
#> read_parquet([1.parquet, 2.parquet])
#> 
#> ---------------------
#> -- Result Columns  --
#> ---------------------
#> - a (DOUBLE)
#> - b (DOUBLE)

Created on 2025-01-20 with reprex v2.1.1
@krlmlr
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krlmlr commented Jan 20, 2025

Specifically, 721d611 is the trigger -- motivated by the upstream change, but not caused by it. Interesting.

@krlmlr krlmlr mentioned this issue Jan 23, 2025
Merged
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fix: Support reading from multiple Parquet files again duckdb/duckdb-r
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