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test_that("summarise peels off a single layer of grouping", {
mf1 <- memdb_frame(x = 1, y = 1, z = 2) %>% group_by(x, y)
mf2 <- mf1 %>% summarise(n = n())
expect_equal(group_vars(mf2), "x")
mf3 <- mf2 %>% summarise(n = n())
expect_equal(group_vars(mf3), character())
})
test_that("summarise performs partial evaluation", {
mf1 <- memdb_frame(x = 1)
val <- 1
mf2 <- mf1 %>% summarise(y = x == val) %>% collect()
expect_equal(mf2$y, 1)
})
test_that("can't refer to freshly created variables", {
lf1 <- lazy_frame(a = 1, b = 1)
expect_snapshot({
(expect_error(summarise(lf1, a_sum = sum(a), issue_col = sum(a_sum))))
# works for variables created in `across()`
# mentions `a_sum`
(expect_error(summarise(lf1, across(c(a, b), list(sum = sum)), issue_col = sum(a_sum))))
# mentions `b_sum`
(expect_error(summarise(lf1, across(c(a, b), list(sum = sum)), issue_col = sum(b_sum))))
# mentions `across()`
(expect_error(summarise(lf1, a_sum = sum(a), issue_col = across(a_sum, sum))))
})
})
test_that("summarise(.groups=)", {
df <- lazy_frame(x = 1, y = 2) %>% group_by(x, y)
# the `dplyr::` prefix is needed for `check()`
# should produce a message when called directly by user
expect_message(eval_bare(
expr(lazy_frame(x = 1, y = 2) %>% dplyr::group_by(x, y) %>% dplyr::summarise() %>% remote_query()),
env(global_env())
))
expect_snapshot(eval_bare(
expr(lazy_frame(x = 1, y = 2) %>% dplyr::group_by(x, y) %>% dplyr::summarise() %>% remote_query()),
env(global_env())
))
# should be silent when called in another package
expect_silent(eval_bare(
expr(lazy_frame(x = 1, y = 2) %>% dplyr::group_by(x, y) %>% dplyr::summarise() %>% remote_query()),
asNamespace("testthat")
))
expect_equal(df %>% summarise() %>% group_vars(), "x")
expect_equal(df %>% summarise(.groups = "drop_last") %>% group_vars(), "x")
expect_equal(df %>% summarise(.groups = "drop") %>% group_vars(), character())
expect_equal(df %>% summarise(.groups = "keep") %>% group_vars(), c("x", "y"))
expect_snapshot(error = TRUE, df %>% summarise(.groups = "rowwise"))
})
test_that("summarise can modify grouping variables", {
lf <- lazy_frame(g = 1, x = 1)
expect_snapshot((result1 <- lf %>% group_by(g) %>% summarise(g = g + 1)))
expect_equal(op_vars(result1), "g")
expect_snapshot((result2 <- lf %>% group_by(g) %>% summarise(x = x + 1, g = g + 1)))
expect_equal(op_vars(result2), c("g", "x"))
})
test_that("across() does not select grouping variables", {
df <- lazy_frame(g = 1, x = 1)
# SELECT `g`, 0.0 AS `x`
expect_snapshot(df %>% group_by(g) %>% summarise(across(.fns = ~ 0)))
})
test_that("summarise() after select() works #985", {
df <- memdb_frame(g = 1, x = 1:3)
expect_equal(
df %>%
select(x) %>%
summarise(x = mean(x, na.rm = TRUE)) %>%
collect(),
tibble(x = 2)
)
})
# .by ----------------------------------------------------------------------
test_that("can group transiently using `.by`", {
df <- memdb_frame(g = c(1, 1, 2, 1, 2), x = c(5, 2, 1, 2, 3))
out <- summarise(df, x = mean(x), .by = g) %>%
arrange(g) %>%
collect()
expect_identical(out$g, c(1, 2))
expect_identical(out$x, c(3, 2))
expect_equal(group_vars(out), character())
})
test_that("can't use `.by` with `.groups`", {
df <- lazy_frame(x = 1)
expect_snapshot(error = TRUE, {
summarise(df, .by = x, .groups = "drop")
})
})
test_that("catches `.by` with grouped-df", {
df <- lazy_frame(x = 1)
gdf <- group_by(df, x)
expect_snapshot(error = TRUE, {
summarise(gdf, .by = x)
})
})
# sql-render --------------------------------------------------------------
test_that("quoting for rendering summarized grouped table", {
out <- copy_to_test("sqlite", tibble(x = 1), name = "verb-summarise") %>%
group_by(x) %>%
summarise(n = n())
expect_snapshot(out %>% sql_render)
expect_equal(out %>% collect, tibble(x = 1, n = 1L))
})
# sql-build ---------------------------------------------------------------
test_that("summarise generates group_by and select", {
out <- lazy_frame(g = 1) %>%
group_by(g) %>%
summarise(n = n()) %>%
sql_build()
expect_equal(out$group_by, sql('`g`'))
expect_equal(out$select, sql('`g`', 'COUNT(*) AS `n`'))
})
# ops ---------------------------------------------------------------------
test_that("summarise replaces existing", {
out <- tibble(x = 1, y = 2) %>% tbl_lazy() %>% summarise(z = 1)
expect_equal(op_vars(out), "z")
})
test_that("summarised vars are always named", {
mf <- dbplyr::memdb_frame(a = 1)
out1 <- mf %>% summarise(1) %>% op_vars()
expect_equal(out1, "1")
})
test_that("grouped summary keeps groups", {
out <- tibble(g = 1, x = 1) %>%
tbl_lazy() %>%
group_by(g) %>%
summarise(y = 1)
expect_equal(op_vars(out), c("g", "y"))
})
test_that("summarise drops one grouping level", {
df <- tibble(g1 = 1, g2 = 2, x = 3) %>% tbl_lazy() %>% group_by(g1, g2)
out1 <- df %>% summarise(y = 1)
out2 <- out1 %>% summarise(y = 2)
expect_equal(op_grps(out1), "g1")
expect_equal(op_grps(out2), character())
})
# lazy_select_query -------------------------------------------------------
test_that("can handle rename", {
lf <- lazy_frame(x = 1:3, y = 3:1)
out <- lf %>%
group_by(x) %>%
rename(ax = x, by = y) %>%
summarise(mean_by = mean(by, na.rm = TRUE)) %>%
.$lazy_query
expect_equal(
out,
lazy_select_query(
x = out$x,
select = list(ax = sym("ax"), mean_by = quo(mean(by, na.rm = TRUE))),
group_by = syms("ax"),
select_operation = "summarise",
group_vars = character()
),
ignore_formula_env = TRUE
)
})
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