xuzifu666 commented on code in PR #4431:
URL: https://github.com/apache/calcite/pull/4431#discussion_r2160367416
##########
core/src/main/java/org/apache/calcite/runtime/SqlFunctions.java:
##########
@@ -1651,8 +1651,31 @@ public static ByteString concat(ByteString s0,
ByteString s1) {
}
/** SQL {@code CONCAT(arg0, arg1, arg2, ...)} function. */
- public static String concatMulti(String... args) {
Review Comment:
According to the documentation, the concat function should be able to use
both string and bytestring, so the previous definition is wrong and should be
directly replaced with Object... instead of String...
case refer cases in MySQL as follow:
```
mysql> select concat(binary('a'),null);
+----------------------------------------------------+
| concat(binary('a'),null) |
+----------------------------------------------------+
| NULL |
+----------------------------------------------------+
1 row in set, 1 warning (0.00 sec)
mysql> select concat(binary('a'),'b');
+--------------------------------------------------+
| concat(binary('a'),'b') |
+--------------------------------------------------+
| 0x6162 |
+--------------------------------------------------+
1 row in set, 1 warning (0.00 sec)
mysql> select concat('a',binary('b'));
+--------------------------------------------------+
| concat('a',binary('b')) |
+--------------------------------------------------+
| 0x6162 |
+--------------------------------------------------+
1 row in set, 1 warning (0.00 sec)
mysql> select concat('a',binary('b'),null);
+------------------------------------------------------------+
| concat('a',binary('b'),null) |
+------------------------------------------------------------+
| NULL |
+------------------------------------------------------------+
1 row in set, 1 warning (0.00 sec)
mysql> select concat('a','b');
+-----------------+
| concat('a','b') |
+-----------------+
| ab |
+-----------------+
1 row in set (0.00 sec)
```
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