Mryange opened a new pull request, #21493:
URL: https://github.com/apache/doris/pull/21493
## Proposed changes
BE : 2.0，FE : 1.2
before
```
mysql [(none)]>select elt(1, 'aaa', 'bbb');
ERROR 1105 (HY000): errCode = 2, detailMessage =
(127.0.0.1)[INTERNAL_ERROR]Function elt get failed, expr is
VectorizedFnCall[elt](arguments=,return=String) and return type is String.
mysql [test]> INSERT INTO tbb VALUES (1, repeat("test1111", 8192))(2,
repeat("test1111", 131072));
mysql [test]>select k1, md5(v1), length(v1) from tbb;
+------+----------------------------------+--------------+
| k1 | md5(`v1`) | length(`v1`) |
+------+----------------------------------+--------------+
| 1 | d41d8cd98f00b204e9800998ecf8427e | 0 |
| 2 | d41d8cd98f00b204e9800998ecf8427e | 0 |
+------+----------------------------------+--------------+
```
now
```
mysql [test]>select elt(1, 'aaa', 'bbb');
+----------------------+
| elt(1, 'aaa', 'bbb') |
+----------------------+
| aaa |
+----------------------+
mysql [test]>select k1, md5(v1), length(v1) from tbb;
+------+----------------------------------+--------------+
| k1 | md5(`v1`) | length(`v1`) |
+------+----------------------------------+--------------+
| 1 | 1f44fb91f47cab16f711973af06294a0 | 65536 |
| 2 | 3c514d3b89e26e2f983b7bd4cbb82055 | 1048576 |
+------+----------------------------------+--------------+
```
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