DonnyZone commented on a change in pull request #1609: [CALCITE-3520] Type cast
from primitive to box is not correct
URL: https://github.com/apache/calcite/pull/1609#discussion_r351570756
##########
File path:
core/src/main/java/org/apache/calcite/adapter/enumerable/EnumUtils.java
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@@ -394,16 +392,6 @@ public static Expression convert(Expression operand, Type
fromType,
Expressions.unbox(operand, toBox),
toBox));
} else if (fromPrimitive != null && toBox != null) {
- // E.g. from "int" to "Long".
- // Generate Long.valueOf(x)
- // Eliminate primitive casts like Long.valueOf((long) x)
- if (operand instanceof UnaryExpression) {
- UnaryExpression una = (UnaryExpression) operand;
- if (una.nodeType == ExpressionType.Convert
- || Primitive.of(una.getType()) == toBox) {
- return Expressions.box(una.expression, toBox);
- }
- }
Review comment:
Yes, this line of code for general case is also added by me in [CALCITE-3414
](https://github.com/apache/calcite/pull/1507).
But the optimization targets on the pattern like
`(byte)(int)->Byte`
In which the operand is `UnaryExpression` with `ExpressionType.Convert`
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