yew1eb opened a new issue, #1680:
URL: https://github.com/apache/auron/issues/1680
**Describe the bug**
The current initcap implementation uses DataFusion's initcap, which does
not match Spark's semantics.
Spark's initcap function semantics (per its description):
```
Returns `str` with the first letter of each word in uppercase. All other
letters are in lowercase. Words are delimited by white space.
```
DataFusion's initcap function semantics (per its description):
```
Capitalizes the first character in each word in the input string. Words are
delimited by non-alphanumeric characters.
```
**To Reproduce**
Run the follwing SQLs:
```
CREATE TABLE tbl(id INT, txt STRING) USING parquet;
INSERT INTO tbl VALUES
(1, 'Hello_world'),
(2, 'robert rose-smith'),
(3, 'foo.bar/baz'),
;
select id, initcap(text) from tbl;
```
**Expected behavior**
```
1,Hello_world
2,Robert Rose-smith
3,Foo.bar/baz
```
**Actual behavior**
```
1,Hello_World
2,Robert Rose-Smith
3,Foo.Bar/Baz
```
**Screenshots**
**Additional context**
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