This topic created in 1958 days ago, the information mentioned may be changed or developed.
比如 from aaa,bbb,ccc
对应文法是<fromlist>:=<field>|<field>,<fromlist>
那么生成树的时候，是直接把三个<field>都作为<fromlist>的儿子节点，还是按照文法的写法，第一个<fromlist>有一个<field>和一个<fromlist>作为儿子，这样
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