laurentgo commented on a change in pull request #1311: [CALCITE-3187] Make
decimal type inference overridable
URL: https://github.com/apache/calcite/pull/1311#discussion_r302566163
##########
File path:
core/src/main/java/org/apache/calcite/rel/type/RelDataTypeFactory.java
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@@ -308,6 +308,29 @@ RelDataType createDecimalQuotient(
@SuppressWarnings("deprecation")
FieldInfoBuilder builder();
+ /**
+ * Infers the return type of a decimal addition. Decimal addition involves
+ * at least one decimal operand and requires both operands to have exact
+ * numeric types.
+ *
+ * @param type1 type of the first operand
+ * @param type2 type of the second operand
+ * @return the result type for a decimal addition, or null if decimal
+ * addition should not be applied to the operands.
+ */
+ RelDataType createDecimalAddition(RelDataType type1, RelDataType type2);
+
+ /**
+ * Infers the return type of a decimal mod operation. Currently only a hook
point
Review comment:
The default should have the same behavior as currently: if one of the
operand types are decimal and both are exact numeric types, return the type of
the second argument. It doesn't change existing behavior of the operand, and
people who use {{RelDataTypeFactory}} can leverage the new method.
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