Walk doesn't traverse with clause

Since withClause has type WithClause and walk only handles Node type, the entire withClause is skipped.

Same issue applies to union larg and rarg.

Walk should traverse with clause and union.

Walk skips with clause and union.

thank you! Super happy to take a PR for this :)

Fix walk function to traverse WithClause and union larg/rarg nodes

@yilinjuang

@yilinjuang pardon the delay, thanks for being patient :)

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