bkmgit commented on pull request #11882:
URL: https://github.com/apache/arrow/pull/11882#issuecomment-1020947191
Comparisons of the form:
```
ValidateBetween(Datum(std::make_shared<ScalarType>("zzz")),
Datum(ArrayFromJSON(TypeTraits<StringType>::type_singleton(), "[]")),
Datum(ArrayFromJSON(TypeTraits<StringType>::type_singleton(),
"[null]")));
```
and
```
ValidateCompare<TypeParam>(eq, "[null]", "[]", "[]");
```
fail with `failed with Invalid: Array arguments must all be the same length`
from
[exec.cc](https://github.com/apache/arrow/blob/master/cpp/src/arrow/compute/exec.cc#L265),
while comparisons of the form
```
ValidateBetween(Datum(std::make_shared<ScalarType>("zzz")),
Datum(ArrayFromJSON(TypeTraits<StringType>::type_singleton(), "[]")),
Datum(ArrayFromJSON(TypeTraits<StringType>::type_singleton(), "[]")));
```
and
```
ValidateBetween(Datum(std::make_shared<ScalarType>("zzz")),
Datum(ArrayFromJSON(TypeTraits<StringType>::type_singleton(),
"[null]")),
Datum(ArrayFromJSON(TypeTraits<StringType>::type_singleton(),
"[null]")));
```
are valid. Is this the behavior that is desired? Would expect comparing null
with empty to give empty for scalar comparisons.
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