danny0405 opened a new pull request #1470: [CALCITE-1178] Allow SqlBetweenOperator to compare DATE and TIMESTAMP URL: https://github.com/apache/calcite/pull/1470 * Add implicit type coercion rules for BETWEEN operator and add test cases * For comparison of NUMERIC and CHARACTER, we coerce the CHARACTER to NUMERIC type which is breaking change.(Before this patch, CHARACTER would be coerced to INT during sql-to-rel conversion) * For "DATETIME and CHARACTER" comparison and equality, add coercion rules during sql node validation, before this patch, the coercion happens during sql-to-rel conversion * Some code refactoring for TypeCoercionConverterTest
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