bratwurzt opened a new pull request #7680: IGNITE-12905 Custom spliterator for QueryKeyValueIterable URL: https://github.com/apache/ignite/pull/7680 Because QueryKeyValueIterable does not implement spliterator, calling `spliterator().hasCharacteristics(Spliterator.SIZED)` will construct a new Spliterator with `java.util.Spliterators#spliteratorUnknownSize(java.util.Iterator<? extends T>, int)` and that will call `org.apache.ignite.internal.processors.cache.QueryCursorImpl#iter` again, thus throwing exception `throw new IgniteException("Iterator is already fetched or query was cancelled.")`
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