API: Rewrite string truncate equality predicates#16383
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Translate equality predicates on string truncate transforms to startsWith predicates when the literal length matches the truncate width. Keep shorter literals as truncate equality predicates and simplify longer literals to alwaysFalse because truncate results cannot exceed the configured width.
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Use short truncate equality literals so row-group filter tests continue to exercise conservative handling for non-reference predicates. Long string literals are now simplified as impossible by the truncate equality binding rewrite.
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Translate equality predicates on string truncate transforms to startsWith predicates when the literal length matches the truncate width.
Keep shorter literals as truncate equality predicates and simplify longer literals to alwaysFalse because truncate results cannot exceed the configured width.