Mryange opened a new pull request, #39937:
URL: https://github.com/apache/doris/pull/39937
## Proposed changes
This is a very subtle bug that can only be reproduced in a non-AVX2
environment.
```
// USE_AVX2 = false
mysql [(none)]>mysql [(none)]>select cast('{"":1, " ":"v1"}' as json);
+----------------------------------+
| cast('{"":1, " ":"v1"}' as JSON) |
+----------------------------------+
| NULL |
+----------------------------------+
//USE_AVX2 = true
mysql [(none)]>select cast('{"":1, " ":"v1"}' as json);
+----------------------------------+
| cast('{"":1, " ":"v1"}' as JSON) |
+----------------------------------+
| {"":1," ":"v1"} |
+----------------------------------+
```
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