alamb opened a new issue, #5479:
URL: https://github.com/apache/arrow-datafusion/issues/5479
**Describe the bug**
`regexp_match` appears to return an empty list rather than the part of the
string matched.
**To Reproduce**
Using datafusion-cli
```sql
❯ create table foo as values ('foo'), ('bar'), ('foobar');
0 rows in set. Query took 0.000 seconds.
❯ select * from foo;
+---------+
| column1 |
+---------+
| foo |
| bar |
| foobar |
+---------+
❯ select regexp_match(column1, 'foo') from foo;
+--------------------------------------+
| regexpmatch(foo.column1,Utf8("foo")) |
+--------------------------------------+
| [] |. <-- note this is empty, not 'foo'!
| |
| [] |. <-- this too!
+--------------------------------------+
3 rows in set. Query took 0.001 seconds.
```
**Expected behavior**
I expect the result to be two lists of `foo`, like postgres:
```sql
postgres=# create table foo as values ('foo'), ('bar'), ('foobar');
SELECT 3
postgres=# select * from foo;
column1
---------
foo
bar
foobar
(3 rows)
postgres=# select regexp_match(column1, 'foo') from foo;
regexp_match
--------------
{foo}
{foo}
(3 rows)
```
**Additional context**
Found by @sanderson on https://github.com/influxdata/docs-v2/pull/4774
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