Jinfeng Ni created DRILL-4688:
---------------------------------
Summary: String functions may produce incorrect result when input
has multi-byte character
Key: DRILL-4688
URL: https://issues.apache.org/jira/browse/DRILL-4688
Project: Apache Drill
Issue Type: Bug
Reporter: Jinfeng Ni
Priority: Critical
As discussed in DRILL-4573, the patch of DRILL-4573 would cause regression of
query correctness, when the input, encoded as utf-8, contains multi-byte
characters.
For example,
{code:sql}
select regexp_matches('München', 'München') res3 from (values(1));
+--------+
| res3 |
+--------+
| false |
+--------+
{code}
Here is the result before the patch of DRILL-4573.
{code}
select regexp_matches('München', 'München') res3 from (values(1));
+-------+
| res3 |
+-------+
| true |
+-------+
{code}
Once this issue has been resolved, QA would add functional testcases to cover
the case of multip-byte characters, so that we will be able to catch such
regression in the first place in the future.
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