Fix crash when using input() in INSERT SELECT JOIN

[Avogar]

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• Bug Fix (user-visible misbehavior in an official stable release)

Changelog entry (a user-readable short description of the changes that goes to CHANGELOG.md):

Fix crash when using input() in INSERT SELECT JOIN. Closes #60035

Documentation entry for user-facing changes

• Documentation is written (mandatory for new features)

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[robot-ch-test-poll1]

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[devcrafter]

Probably some comment would be helpful.

[Avogar]

I think the condition is self-describing, if use_structure_from_insertion_table_in_table_functions is enabled, table function needs structure hint and we have both insertion table and select query, we go to the logic of using structure from insertion table in table function. Previously we just didn't check that we actually have select query AST (it could be nullptr).
I can write it in a comment, but imo it will just repeat what is written in the condition. Maybe I just don't see what part is confusing and requires a comment

[devcrafter]

This is new code to me, I need more context to get it straight. One way to simplify the complex condition is to assign it to a variable with a self-explanatory name. Probably, it can help