Improve documentation on LogicalPlan
TreeNode methods
#10037
Merged
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Which issue does this PR close?
Part of #8913 and part of #7013
Rationale for this change
The TreeNode API has everything we need, but finding the right methods is sometimes challenging. Along with #10035 I think this will make it easier to use
What changes are included in this PR?
Are these changes tested?
CI
Are there any user-facing changes?
No functional changes