DonnyZone commented on issue #1609: [CALCITE-3520] Type cast from primitive to box is not correct URL: https://github.com/apache/calcite/pull/1609#issuecomment-561149310 I found there is a function `assignableFrom` in `Primitive`. It conduct fine-grained check on primitive type's assignment. Therefore, we can add a condition and keep this optimization.
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