branch-3.0: [Fix](function) Fix wrong decimal of unix_timestamp (#55013)#55961
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zclllyybb wants to merge 1 commit intoapache:branch-3.0from
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branch-3.0: [Fix](function) Fix wrong decimal of unix_timestamp (#55013)#55961zclllyybb wants to merge 1 commit intoapache:branch-3.0from
zclllyybb wants to merge 1 commit intoapache:branch-3.0from
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when the input datetime has decimal part start with zero, the result was
wrong before. now fixed.
before:
```sql
mysql> select UNIX_TIMESTAMP('2015-11-13 10:20:19.012');
+-------------------------------------------+
| UNIX_TIMESTAMP('2015-11-13 10:20:19.012') |
+-------------------------------------------+
| 1447381219.120 |
+-------------------------------------------+
```
now:
```sql
mysql> select UNIX_TIMESTAMP('2015-11-13 10:20:19.012');
+-------------------------------------------+
| UNIX_TIMESTAMP('2015-11-13 10:20:19.012') |
+-------------------------------------------+
| 1447381219.012 |
+-------------------------------------------+
```
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pick #55013