planner: allow leading hint to support recursive writing style like leading((a, b), (c, d)) #63253
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planner: allow
leading hint to support recursive writing style like leading((a, b), (c, d)) #63253
Enhancement
The expressive ability of hints syntax is relatively simple and does not support scenarios such as "First associate table a and b, and tables c and d respectively, and then associate the two result sets.
Should support more leading expression effects (e.g., leading(a, (b,c), leading((a,b), (c,d).