qzsee commented on pull request #6526:
URL: https://github.com/apache/incubator-doris/pull/6526#issuecomment-910064230
> ```c++
> Status ExprContext::prepare(RuntimeState* state, const RowDescriptor&
row_desc,
> const std::shared_ptr<MemTracker>& tracker) {
> _prepared = true;
> ...
> }
>
> Status ExprContext::open(RuntimeState* state) {
> DCHECK(_prepared);
> ...
> }
> ```
>
> Maybe you can refer to the `ExprContext` method to avoid repeatedly
calling prepare by mistake?
The process of preparing is normal
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