jinxing64 opened a new pull request #1330: [CALCITE-3211] MutableRel returned from MutableRels::toMutables may lose reference to parent URL: https://github.com/apache/calcite/pull/1330 Current implementation of MutableRels::toMutables is as below: ``` private static List<MutableRel> toMutables(List<RelNode> nodes) { return Lists.transform(nodes, MutableRels::toMutable); } ``` Thus every time we get from the result list, a new `MutableRel` will be created: ``` private static class TransformingRandomAccessList<F, T> extends AbstractList<T> implements RandomAccess, Serializable { final List<F> fromList; final Function<? super F, ? extends T> function; TransformingRandomAccessList(List<F> fromList, Function<? super F, ? extends T> function) { this.fromList = checkNotNull(fromList); this.function = checkNotNull(function); } @Override public T get(int index) { return function.apply(fromList.get(index)); } ...... ``` As a result, the parent information will be lost. This PR propose to refine the implementation of `MutableRels::toMutables` and avoid creating a new `MutableRel` every time when we get the object.
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