maropu commented on pull request #29009:
URL: https://github.com/apache/spark/pull/29009#issuecomment-654207971
I get a bit confiused and Hive really supports REGEX as a function?
```
// REGEXP case in hive (3.1.1)
hive> SELECT 'abc' REGEXP '([a-z]+)';
OK
true
hive> select REGEXP('abc','([a-z]+)');
NoViableAltException(251@[])
at
org.apache.hadoop.hive.ql.parse.HiveParser_SelectClauseParser.selectClause(HiveParser_SelectClauseParser.java:962)
...
FAILED: ParseException line 1:7 cannot recognize input near 'REGEXP' '('
''abc'' in select clause
// RLIKE in hive
hive> SELECT 'abc' RLIKE '([a-z]+)';
OK
true
hive> select RLIKE('abc','([a-z]+)');
NoViableAltException(265@[])
at
org.apache.hadoop.hive.ql.parse.HiveParser_SelectClauseParser.selectClause(HiveParser_SelectClauseParser.java:962)
...
FAILED: ParseException line 1:7 cannot recognize input near 'RLIKE' '('
''abc'' in select clause
// REGEXP in mysql
mysql> SELECT 'abc' REGEXP '([a-z]+)';
+-------------------------+
| 'abc' REGEXP '([a-z]+)' |
+-------------------------+
| 1 |
+-------------------------+
mysql> select REGEXP('abc','([a-z]+)');
ERROR 1064 (42000): You have an error in your SQL syntax; check the manual
that corresponds to your MySQL server version for the right syntax to use near
'REGEXP('abc','([a-z]+)')' at line 1
// RLIKE in mysql
mysql> SELECT 'abc' RLIKE '([a-z]+)';
+------------------------+
| 'abc' RLIKE '([a-z]+)' |
+------------------------+
| 1 |
+------------------------+
mysql> select RLIKE('abc','([a-z]+)');
ERROR 1064 (42000): You have an error in your SQL syntax; check the manual
that corresponds to your MySQL server version for the right syntax to use near
'RLIKE('abc','([a-z]+)')' at line 1
```
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