perf(553): Optimize incremental join evaluation #557
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Fixes #553.
Before this change, we would use the same query plan on both subscription initialization as well as incremental evaluation.
This is problematic for left index joins that read from the right table and probe the index of the left table.
In particular, updates to the left table will use the same query plan, which means they will read the entire right table.
After this change, updates to the left table will only read those updates and probe the index of the right table.
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