maropu commented on a change in pull request #26477: [SPARK-29776][SQL] rpad
returning invalid value when parameter is empty
URL: https://github.com/apache/spark/pull/26477#discussion_r361252749
##########
File path:
sql/core/src/test/resources/sql-tests/results/postgreSQL/strings.sql.out
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@@ -907,7 +907,7 @@ SELECT rpad('hi', 5, '')
-- !query 110 schema
struct<rpad(hi, 5, ):string>
-- !query 110 output
-hi
+NULL
Review comment:
Thanks for the check. It seems presto throws an exception for that case;
```
presto> select rpad('hi', 5, '');
Query 20191225_040937_00004_htqqc failed: Padding string must not be empty
```
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