[flink] Fix literal conversion for BETWEEN predicates - #9310
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Signed-off-by: QuakeWang <wangfuzheng0814@foxmail.com>
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Purpose
PredicateConverterpassedBETWEENbounds directly as Flink expression objects instead of converting them to typed Paimon literal values. This could produce predicates with incompatible bound types, especially when implicit type conversion or null bounds were involved.Convert both bounds using the referenced field type before building the predicate.
Tests
PredicateConverterTestwith both Flink 1 and Flink 2 profiles.