Dandandan opened a new issue, #22257:
URL: https://github.com/apache/datafusion/issues/22257
Split out from #22247.
### Mismatch
\`regexp_instr\` with an empty pattern should return 1.
```sql
SELECT regexp_instr('abc', '');
```
PostgreSQL:
```text
1
```
DataFusion:
```text
0
```
### Expected behavior
For PostgreSQL-compatible SQL semantics, DataFusion should either match
PostgreSQL's result or raise the same class of domain/semantic error.
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