Support plan cache for partial index on limit cases for the constraint `col is not null`
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sig/planner
type/enhancement
- Dominant language
- Go
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Description
## Enhancement
We only support the plan cache for very limited cases:
- The constraint of the partial index is `column is not null`
- The given SQL must have the compare operators `>\<\>=\<=\=`(`nulleq` is excluded because it can accept null value) on the constraint column.
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