gianm commented on code in PR #15743:
URL: https://github.com/apache/druid/pull/15743#discussion_r1479179999
##########
processing/src/main/java/org/apache/druid/math/expr/ConstantExpr.java:
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@@ -39,9 +40,12 @@
* {@link Expr.ObjectBinding}. {@link ConstantExpr} are terminal nodes of an
expression tree, and have no children
* {@link Expr}.
*/
+@Immutable
abstract class ConstantExpr<T> implements Expr
{
final ExpressionType outputType;
+
+ @SuppressWarnings("Immutable")
Review Comment:
What does `@Immutable` do and why are these various
`@SuppressWarnings("Immutable")` necessary (here, in BaseTypeSignature, in
ColumnCapabilitiesImpl)?
I am not familiar with this annotation so was just wondering what the extra
lines are for.
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