Github user davies commented on a diff in the pull request: https://github.com/apache/spark/pull/20561#discussion_r167299716 --- Diff: sql/core/src/main/java/org/apache/spark/sql/execution/UnsafeKVExternalSorter.java --- @@ -98,10 +99,20 @@ public UnsafeKVExternalSorter( numElementsForSpillThreshold, canUseRadixSort); } else { - // The array will be used to do in-place sort, which require half of the space to be empty. - // Note: each record in the map takes two entries in the array, one is record pointer, - // another is the key prefix. - assert(map.numKeys() * 2 <= map.getArray().size() / 2); + // `BytesToBytesMap`'s point array is only guaranteed to hold all the distinct keys, but + // `UnsafeInMemorySorter`'s point array need to hold all the entries. Since `BytesToBytesMap` --- End diff -- It's possible to change UnsafeInMemorySorter to have multiple entries with same key.
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