tests/testthat/test-remote.R

In dbplyr: A 'dplyr' Back End for Databases

test_that("remote_table returns name when it makes sense", {
  mf <- copy_to_test("sqlite", tibble(x = 5), name = "refxiudlph")

  # produces name after `group_by()`
  expect_equal(
    mf %>% group_by(x) %>% remote_table(),
    as_table_ident(ident("refxiudlph"))
  )

  # produces name after unarranging
  expect_equal(
    mf %>% arrange(x) %>% arrange() %>% remote_table(),
    as_table_ident(ident("refxiudlph"))
  )

  # produces name after compute()
  expect_false(is_null(mf %>% mutate(x = x + 1) %>% compute() %>% remote_table()))
})

test_that("remote_table returns null for computed tables", {
  mf <- copy_to_test("sqlite", tibble(x = 5, y = 1), name = "refxiudlph")
  expect_equal(remote_table(mf), as_table_ident(ident("refxiudlph")))

  expect_null(mf %>% filter(x == 3) %>% remote_table())
  expect_null(mf %>% distinct(x) %>% remote_table())
  expect_null(mf %>% mutate(x = x + 1) %>% remote_table())
  expect_null(mf %>% select(x) %>% remote_table())
  expect_null(mf %>% relocate(y, x) %>% remote_table())
  expect_null(mf %>% head(3) %>% remote_table())

  expect_null(left_join(mf, mf, by = "x") %>% remote_table())
  lf <- lazy_frame(x = 1)
  expect_null(lf %>% remote_table())
  expect_null(lf %>% group_by(x) %>% remote_table())

  lf <- lazy_frame(x = 1)
  expect_equal(lf %>% remote_table(null_if_local = FALSE), as_table_ident(ident("df")))
  expect_equal(lf %>% group_by(x) %>% remote_table(null_if_local = FALSE), as_table_ident(ident("df")))
})

test_that("remote_name and remote_table can handle different table identifiers", {
  test_remote_table <- function(x, exp_tbl = as_table_ident(x), exp_name = "tbl") {
    lf <- lazy_frame(x = 1, .name = x)
    expect_equal(remote_table(lf, null_if_local = FALSE), exp_tbl)
    expect_equal(remote_name(lf, null_if_local = FALSE), exp_name)
  }

  test_remote_table("tbl")
  test_remote_table(ident("tbl"))
  test_remote_table(in_schema("schema", "tbl"))
  test_remote_table(in_catalog("catalog", "schema", "tbl"))
  test_remote_table(DBI::Id(catalog = "catalog", schema = "schema", table = "tbl"))

  withr::local_options(rlib_message_verbosity = "quiet")
  test_remote_table(ident_q("schema.tbl"), exp_name = NULL)
  test_remote_table(sql("schema.tbl"), exp_name = NULL)
})

test_that("can retrieve query, src and con metadata", {
  mf <- memdb_frame(x = 5)

  expect_s4_class(remote_con(mf), "DBIConnection")
  expect_s3_class(remote_src(mf), "src_sql")
  expect_s3_class(remote_query(mf), "sql")
  expect_type(remote_query_plan(mf), "character")
})