jorisvandenbossche commented on a change in pull request #8990:
URL: https://github.com/apache/arrow/pull/8990#discussion_r551292722
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File path: cpp/src/arrow/compute/kernels/scalar_string_test.cc
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@@ -428,6 +433,26 @@ TYPED_TEST(TestStringKernels,
StrptimeDoesNotProvideDefaultOptions) {
ASSERT_RAISES(Invalid, CallFunction("strptime", {input}));
}
+TYPED_TEST(TestStringKernels, Join) {
+ auto separator = this->scalar("--");
+ CheckScalarBinary(
+ "binary_join", list(this->type()),
+ R"([["a", "bb", "ccc"], [], null, ["dd"], ["eee", null], ["ff", ""]])",
separator,
+ this->type(), R"(["a--bb--ccc", "", null, "dd", null, "ff--"])");
Review comment:
Another option could also be to skip nulls from the list, instead of
skipping the list entirely if there is a null present?
(so eg `["eee", null]` could give `"eee"` instead of ``null``?
(don't really know what is most sensible to do, but generally for
aggregations (and you can see a single join as a kind of aggregation?) nulls
get skipped instead of propagated)
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