DonnyZone opened a new pull request #1381: [CALCITE-3245] CompileException in Janino when a query contains a division between a Double and a BigDecimal URL: https://github.com/apache/calcite/pull/1381 This PR is proposed to handle the exception caused by Java `BigDecimal` type in [CALCITE-3245](https://issues.apache.org/jira/browse/CALCITE-3245). (1) Implement `getPrecision` and `getScale` in JavaType. As BigDecimal will trigger the computation on precision and scale (`deriveDecimalPlusType` , `deriveDecimalMultiplyType` in `RelDataTypeSystem`), but the default `PRECISION_NOT_SPECIFIED` and `SCALE_NOT_SPECIFIED` value will cause the assertions. (2) Specially handle cast on `BigDecimal.class`. Current now, there are more than one implementations for data type conversion, such as **`Types.castIfNecessary`**, `**RexToLixTranslator.convert**`, **`RexToLixTranslator.translateCast, and etc`**. We need to unify them later.
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