rluvaton commented on issue #21231:
URL: https://github.com/apache/datafusion/issues/21231#issuecomment-4188619900

   `children` must return all expressions that the expression is using, 
otherwise how would you check if a given expression exists anywhere in the tree 
or do any kind of traversal that doesn't care about the schema, like wrap every 
expression with debug expression that print the input and output, or add timing 
and so on


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