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test_that("group_by with .add = TRUE adds groups", {
mf <- memdb_frame(x = 1:3, y = 1:3)
gf1 <- mf %>% group_by(x, y)
gf2 <- mf %>% group_by(x) %>% group_by(y, .add = TRUE)
expect_equal(group_vars(gf1), c("x", "y"))
expect_equal(group_vars(gf2), c("x", "y"))
})
test_that("warns about add argument ", {
mf <- memdb_frame(x = 1:3, y = 1:3)
expect_warning(
gf <- mf %>% group_by(x) %>% group_by(y, add = TRUE),
"deprecated"
)
expect_equal(group_vars(gf), c("x", "y"))
})
test_that("errors for .drop = FALSE", {
expect_snapshot(
error = TRUE,
lazy_frame(x = 1:3, y = 1:3) %>% group_by(y, .drop = FALSE)
)
})
test_that("informative errors for missing variables", {
expect_snapshot({
(expect_error(lazy_frame(x = 1:3) %>% group_by(y)))
})
})
test_that("group_by() produces nice error messages", {
lf <- lazy_frame(x = 1)
expect_snapshot(error = TRUE, {
lf %>% group_by(z = non_existent + 1)
lf %>% group_by(across(non_existent))
})
})
test_that("collect, collapse and compute preserve grouping", {
g <- memdb_frame(x = 1:3, y = 1:3) %>% group_by(x, y)
expect_equal(group_vars(compute(g)), c("x", "y"))
expect_equal(group_vars(collapse(g)), c("x", "y"))
expect_equal(group_vars(collect(g)), c("x", "y"))
})
test_that("joins preserve grouping", {
g <- memdb_frame(x = 1:3, y = 1:3) %>% group_by(x)
expect_equal(group_vars(inner_join(g, g, by = c("x", "y"))), "x")
expect_equal(group_vars(left_join(g, g, by = c("x", "y"))), "x")
expect_equal(group_vars(semi_join(g, g, by = c("x", "y"))), "x")
expect_equal(group_vars(anti_join(g, g, by = c("x", "y"))), "x")
})
test_that("group_by can perform mutate", {
mf <- memdb_frame(x = 3:1, y = 1:3)
out <- mf %>%
group_by(z = x + y) %>%
summarise(n = n()) %>%
collect()
expect_equal(out, tibble(z = 4L, n = 3L))
})
test_that("group_by handles empty dots", {
lf <- lazy_frame(x = 1) %>% group_by(x)
expect_equal(lf %>% group_by() %>% group_vars(), character())
expect_equal(lf %>% group_by(!!!list()) %>% group_vars(), character())
expect_equal(lf %>% group_by(.add = TRUE) %>% group_vars(), c("x"))
})
test_that("only adds step if necessary", {
lf <- lazy_frame(x = 1, y = 1)
expect_equal(lf %>% group_by(), lf)
expect_equal(lf %>% ungroup(), lf)
expect_equal(lf %>% ungroup(x), lf)
lf_grouped <- lf %>% group_by(x)
lf_grouped2 <- lf_grouped %>% group_by(x)
expect_equal(lf_grouped, lf_grouped2)
expect_equal(lf_grouped %>% ungroup(y), lf_grouped)
out <- lf_grouped %>% mutate(y = y - mean(y)) %>% group_by()
expect_equal(group_vars(out), character())
})
test_that("group_by mutate is not optimised away", {
lf <- lazy_frame(x = 1) %>% group_by(x)
expect_equal(
lf %>% group_by(x = x + 1) %>% remote_query(),
sql("SELECT `x` + 1.0 AS `x`\nFROM `df`")
)
})
# sql_build ---------------------------------------------------------------
test_that("ungroup drops PARTITION BY", {
out <- lazy_frame(x = 1) %>%
group_by(x) %>%
ungroup() %>%
mutate(x = sum(x)) %>%
sql_build()
expect_equal(out$select, sql(x = 'SUM(`x`) OVER ()'))
})
# ops ---------------------------------------------------------------------
test_that("group_by overrides existing groups", {
df <- tibble(g1 = 1, g2 = 2, x = 3) %>% tbl_lazy()
out1 <- df %>% group_by(g1)
expect_equal(op_grps(out1), "g1")
out2 <- out1 %>% group_by(g2)
expect_equal(op_grps(out2), "g2")
})
test_that("group_by increases grouping if add = TRUE", {
df <- tibble(g1 = 1, g2 = 2, x = 3) %>% tbl_lazy()
out <- df %>% group_by(g1) %>% group_by(g2, .add = TRUE)
expect_equal(op_grps(out), c("g1", "g2"))
})
test_that("ungroup drops all groups", {
out1 <- lazy_frame(g1 = 1, g2 = 2) %>%
group_by(g1, g2) %>%
ungroup()
out2 <- lazy_frame(g1 = 1, g2 = 2) %>%
group_by(g1, g2) %>%
ungroup() %>%
rename(g3 = g1)
expect_equal(op_grps(out1), character())
expect_equal(op_grps(out2), character())
})
test_that("ungroup() produces nice error messages", {
expect_snapshot(error = TRUE, {
lazy_frame(x = 1) %>% ungroup(non_existent)
})
})
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