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branch-2.1: [fix](FoldConst)The length function returns incorrect results under FoldConst. #40947 #46703

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branch-2.1: [fix](FoldConst)The length function returns incorrect results under FoldConst. #40947 #46703

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@github-actions github-actions bot commented Jan 9, 2025

Cherry-picked from #40947

@Mryange
[fix](FoldConst)The length function returns incorrect results under F…
ee89537 
…oldConst. (#40947)

## Proposed changes

```
mysql [(none)]>set debug_skip_fold_constant = false;
Query OK, 0 rows affected (0.00 sec)

mysql [(none)]>select length('你');
+---------------+
| length('你')  |
+---------------+
|             1 |
+---------------+
1 row in set (0.01 sec)

mysql [(none)]>set debug_skip_fold_constant = true;
Query OK, 0 rows affected (0.00 sec)

mysql [(none)]>select length('你');
+---------------+
| length('你')  |
+---------------+
|             3 |
+---------------+
```

<!--Describe your changes.-->
@hello-stephen
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Thank you for your contribution to Apache Doris.
Don't know what should be done next? See How to process your PR.

Please clearly describe your PR:

  1. What problem was fixed (it's best to include specific error reporting information). How it was fixed.
  2. Which behaviors were modified. What was the previous behavior, what is it now, why was it modified, and what possible impacts might there be.
  3. What features were added. Why was this function added?
  4. Which code was refactored and why was this part of the code refactored?
  5. Which functions were optimized and what is the difference before and after the optimization?

@dataroaring dataroaring closed this Jan 9, 2025
@dataroaring dataroaring reopened this Jan 9, 2025
@hello-stephen
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run buildall

@Mryange
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Mryange commented Jan 10, 2025

#46523 has already been merged.

@yiguolei yiguolei closed this Jan 10, 2025
@dataroaring dataroaring deleted the auto-pick-40947-branch-2.1 branch January 19, 2025 09:15
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@hello-stephen @Mryange @yiguolei @dataroaring