SeasonPilot commented on issue #366:
URL: https://github.com/apache/geaflow/issues/366#issuecomment-3537414538

   IS SOURCE OF 语法实现过程中遇到一个问题,请教下如何解决?
   Calcite的扩展机制不支持在 Expression2 层级(二元/中缀运算符)添加自定义多关键字运算符
   
   使用函数调用语法?
   source_of(e, a)   或者  IS_SOURCE_OF(a, e)  ?


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