jonkeane commented on a change in pull request #10888:
URL: https://github.com/apache/arrow/pull/10888#discussion_r697644390
##########
File path: r/tests/testthat/test-dataset.R
##########
@@ -1071,6 +1071,60 @@ test_that("Scanner$ToRecordBatchReader()", {
)
})
+test_that("Scanner$create() filter/projection pushdown", {
+ ds <- open_dataset(dataset_dir, partitioning = "part")
+
+ # the standard to compare all Scanner$create()s against
+ scan_one <- ds %>%
+ filter(int > 7 & dbl < 57) %>%
+ select(int, dbl, lgl) %>%
+ mutate(int_plus = int + 1, dbl_minus = dbl - 1) %>%
+ Scanner$create()
+
+ # add a column in projection
+ scan_two <- ds %>%
+ filter(int > 7 & dbl < 57) %>%
+ select(int, dbl, lgl) %>%
+ mutate(int_plus = int + 1) %>%
+ Scanner$create(projection = list(
+ "int", "dbl", "lgl", "int_plus",
Review comment:
Yeah, you're right — I've backed out the ability to commingle these and
now you either can do all characters _or_ expressions (with possibly many `a =
Expression$field_ref("a")`)
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