vlsi commented on pull request #2441:
URL: https://github.com/apache/calcite/pull/2441#issuecomment-864899298
`@SuppressWarnings("methodref.receiver.bound.invalid")` on the field
declaration.
What the warning says is: "you publish a reference to uninitialized `this`",
so the callee might observe unitialized object and fail with NPE or something.
In other words, typically it is a bad practice to publish `this` from the
middle of the constructor, however, `memoize` is a reasonable exception.
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