4paradigm / 4paradigm/OpenMLDB
Engine optimize: optimize time expression based on time column index
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**Is your feature request related to a problem? Please describe.**
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### Example:
```SQL
SELECT t1.*, t2.* from t1
LAST JOIN t2 ORDER BY t2.std_ts
ON t1.id=t2.id and t2.std_ts BETWEEN timestamp("2021-01-01") and timestamp("2021-06-01");
```
We would like to optimize join with BETWEEN ... AND expression
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