Github user viirya commented on the issue:
https://github.com/apache/spark/pull/17623
> What are the external impacts of these changes? Which commands are
impacted?
This patch mainly cleans up the definition of two string representation
methods: `simpleString`, `verboseString`. `simpleString` doesn't show argument
info anymore. `verboseString` doesn't show children info anymore.
Due to above change, `Expression.treeString` is changed too. Previously we
show duplicate children information, like the example shown in the pr
description. Now the children info is shown only once as tree representation.
We don't have too much similar mess in `QueryPlan`. Previously,
`QueryPlan.verboseString` is the alias of `QueryPlan.simpleString`. Following
the definition above, now `QueryPlan.simpleString` shows simple string
representation without argument info.
After this patch, in order to know the arguments of an expression/query
plan, an user should use `verboseString`, instead of `simpleString`. In order
to know the children of an expression/query plan, an user should use
`treeString`, instead of `verboseString`.
I think the only one command uses those string representations is
`explain`. This patch won't cause change to its output.
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