Github user fhueske commented on a diff in the pull request: https://github.com/apache/flink/pull/1469#discussion_r50384749 --- Diff: flink-runtime/src/main/java/org/apache/flink/runtime/operators/hash/MutableHashTable.java --- @@ -486,11 +518,43 @@ protected boolean processProbeIter() throws IOException{ } } // -------------- partition done --------------- - + return false; } + protected boolean processUnmatchedBuildIter() throws IOException { + if (this.unmatchedBuildVisited) { + return false; + } + + this.probeMatchedPhase = false; + UnmatchedBuildIterator<BT, PT> unmatchedBuildIter = new UnmatchedBuildIterator<>(this.buildSideSerializer, this.numBuckets, + this.bucketsPerSegmentBits, this.bucketsPerSegmentMask, this.buckets, this.partitionsBeingBuilt, probedSet); + this.unmatchedBuildIterator = unmatchedBuildIter; + + // There maybe none unmatched build element, so we add a verification here to make sure we do not return (null, null) to user. + if (unmatchedBuildIter.next() == null) { + this.unmatchedBuildVisited = true; + return false; + } + + unmatchedBuildIter.back(); + + // While visit the unmatched build elements, the probe element is null, and the unmatchedBuildIterator + // would iterate all the unmatched build elements, so we return false during the second calling of this method. + if (!this.unmatchedBuildVisited) { --- End diff -- But you leave the method in line 538 with `return false` and the check in line 526 prevents that you get to line 545 if `unmatchedBuildVisited == true` again.
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