neilconway opened a new pull request, #20209:
URL: https://github.com/apache/datafusion/pull/20209
The previous coding returned an array of the wrong type, leading to an
assertion failure.
## Rationale for this change
```
create table tt (x string);
insert into tt values ('a'), ('b,a'), ('c'), (null);
select find_in_set(tt.x, null) from tt;
select find_in_set(null, tt.x) from tt;
```
Yields:
```
Internal error: Assertion failed: result_data_type == *expected_type:
Function 'find_in_set' returned value of type 'Utf8View' while the following
type was promised at planning time and expected: 'Int32'.
This issue was likely caused by a bug in DataFusion's code. Please help us
to resolve this by filing a bug report in our issue tracker:
https://github.com/apache/datafusion/issues
Internal error: Assertion failed: result_data_type == *expected_type:
Function 'find_in_set' returned value of type 'Utf8View' while the following
type was promised at planning time and expected: 'Int32'.
This issue was likely caused by a bug in DataFusion's code. Please help us
to resolve this by filing a bug report in our issue tracker:
https://github.com/apache/datafusion/issues
```
## Are these changes tested?
Yes, added an SLT test.
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