pitrou commented on a change in pull request #10857:
URL: https://github.com/apache/arrow/pull/10857#discussion_r681623417
##########
File path: cpp/src/arrow/compute/kernels/scalar_string_test.cc
##########
@@ -395,6 +395,13 @@ TYPED_TEST(TestStringKernels, AsciiLower) {
"[\"aaazzæÆ&\", null, \"\", \"bbb\"]");
}
+TYPED_TEST(TestStringKernels, AsciiCapitalize) {
+ this->CheckUnary("ascii_capitalize", "[]", this->type(), "[]");
+ this->CheckUnary("ascii_capitalize",
+ "[\"aAazZæÆ&\", null, \"\", \"bBB\", \"one word\"]",
this->type(),
+ "[\"AAazZæÆ&\", null, \"\", \"BBB\", \"One word\"]");
Review comment:
Can you test a bit more thoroughly?
For example in Python:
```python
>>> "hEllo world".capitalize()
'Hello world'
```
##########
File path: cpp/src/arrow/compute/kernels/scalar_string.cc
##########
@@ -443,6 +443,24 @@ struct AsciiLower {
}
};
+struct AsciiCapitalizeTransform : public StringTransformBase {
+ int64_t Transform(const uint8_t* input, int64_t input_string_ncodeunits,
+ uint8_t* output) {
+ if (input_string_ncodeunits > 0) {
+ output[0] = ascii_toupper(input[0]);
+ std::memcpy(output + 1, input + 1, input_string_ncodeunits - 1);
+ }
+ return input_string_ncodeunits;
+ }
+
+ Status InvalidStatus() override {
Review comment:
It's not clear to me why this function is being overriden if the
function always returns successfully.
##########
File path: cpp/src/arrow/compute/kernels/scalar_string.cc
##########
@@ -4018,6 +4036,13 @@ const FunctionDoc ascii_lower_doc(
"non-ASCII characters, use \"utf8_lower\" instead."),
{"strings"});
+const FunctionDoc ascii_capitalize_doc(
+ "Capilatize the first character of ASCII input",
+ ("For each string in `strings`, return a capitalized version.\n\n"
+ "This function assumes the input is fully ASCII. If it may contain\n"
+ "non-ASCII characters, use \"utf8_capitalize\" instead."),
Review comment:
I don't see utf8_capitalize in this PR. Is this an oversight?
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