I have read the source code of postgres.c. Two strang things I can't understand.
Souce code of Postgres.c:
Foreach(parsetree_list的元素parsetree){ //In what situation here will be many 
(List *)querytree_list = pg_analyze_and_rewrite(parsetree);
        foreach(querytree_list中的每个querytree){ //In what situation here will be 
many querytrees?

Who can tell me the reason?
Thank you very much

Jinqiang Han

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