filter.tbl_lazy function

Subset rows using column values

This is a method for the dplyr filter() generic. It generates the WHERE clause of the SQL query.

## S3 method for class 'tbl_lazy'
filter(.data, ..., .by = NULL, .preserve = FALSE)

Arguments

• .data: A lazy data frame backed by a database query.
• ...: <data-masking> Variables, or functions of variables. Use desc() to sort a variable in descending order.
• .by: <tidy-select> Optionally, a selection of columns to group by for just this operation, functioning as an alternative to group_by(). For details and examples, see ?dplyr_by .
• .preserve: Not supported by this method.

Returns

Another tbl_lazy. Use show_query() to see the generated query, and use collect() to execute the query and return data to R.

Examples

library(dplyr, warn.conflicts = FALSE)

db <- memdb_frame(x = c(2, NA, 5, NA, 10), y = 1:5)
db %>% filter(x < 5) %>% show_query()
db %>% filter(is.na(x)) %>% show_query()