[feature](routineload) Add routine load target-table alter support - #64878

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0AyanamiRei:feature/routine-load-target-table-switch

Commits on Jun 26, 2026

Commits on Jul 15, 2026

[feature](routine-load) Support composable target table alteration
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Commits on Jul 19, 2026

[fix](fe) Authorize routine load target before metadata lookup
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[refactor](fe) Narrow routine load target-table changes
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Commits on Jul 23, 2026

Commits on Jul 27, 2026