Turns implicit missing values into explicit missing values. This is a method
for the tidyr::complete() generic.
Usage
# S3 method for tbl_lazy
complete(data, ..., fill = list())Arguments
- data
A lazy data frame backed by a database query.
- ...
Specification of columns to expand. See tidyr::expand for more details.
- fill
A named list that for each variable supplies a single value to use instead of NA for missing combinations.
Value
Another tbl_lazy. Use show_query() to see the generated
query, and use collect() to execute the query
and return data to R.
Examples
df <- memdb_frame(
group = c(1:2, 1),
item_id = c(1:2, 2),
item_name = c("a", "b", "b"),
value1 = 1:3,
value2 = 4:6
)
df %>% tidyr::complete(group, nesting(item_id, item_name))
#> # Source: SQL [4 x 5]
#> # Database: sqlite 3.40.1 [:memory:]
#> group item_id item_name value1 value2
#> <dbl> <dbl> <chr> <int> <int>
#> 1 1 1 a 1 4
#> 2 1 2 b 3 6
#> 3 2 1 a NA NA
#> 4 2 2 b 2 5
# You can also choose to fill in missing values
df %>% tidyr::complete(group, nesting(item_id, item_name), fill = list(value1 = 0))
#> # Source: SQL [4 x 5]
#> # Database: sqlite 3.40.1 [:memory:]
#> group item_id item_name value1 value2
#> <dbl> <dbl> <chr> <dbl> <int>
#> 1 1 1 a 1 4
#> 2 1 2 b 3 6
#> 3 2 1 a 0 NA
#> 4 2 2 b 2 5