Github user ericl commented on a diff in the pull request:
https://github.com/apache/spark/pull/13318#discussion_r64701881
--- Diff:
sql/core/src/main/java/org/apache/spark/sql/execution/UnsafeKVExternalSorter.java
---
@@ -86,14 +88,16 @@ public UnsafeKVExternalSorter(
prefixComparator,
/* initialSize */ 4096,
pageSizeBytes,
- keySchema.length() == 1 &&
SortPrefixUtils.canSortFullyWithPrefix(keySchema.apply(0)));
+ canUseRadixSort);
} else {
+ // The array will be used to do in-place sort, which require half of
the space to be empty.
+ assert(map.numKeys() <= map.getArray().size() / 2);
// During spilling, the array in map will not be used, so we can
borrow that and use it
// as the underline array for in-memory sorter (it's always large
enough).
// Since we will not grow the array, it's fine to pass `null` as
consumer.
final UnsafeInMemorySorter inMemSorter = new UnsafeInMemorySorter(
null, taskMemoryManager, recordComparator, prefixComparator,
map.getArray(),
- false /* TODO(ekl) we can only radix sort if the BytesToBytes load
factor is <= 0.5 */);
+ canUseRadixSort);
--- End diff --
Can we assert the load factor is under 0.5 here?
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