Github user JoshRosen commented on a diff in the pull request:
https://github.com/apache/spark/pull/7948#discussion_r36272385
--- Diff:
sql/core/src/main/java/org/apache/spark/sql/execution/UnsafeKVExternalSorter.java
---
@@ -82,8 +82,15 @@ public UnsafeKVExternalSorter(StructType keySchema,
StructType valueSchema,
pageSizeBytes);
} else {
// Insert the records into the in-memory sorter.
+ // We will use the number of elements in the map as the initialSize
of the
+ // UnsafeInMemorySorter. Because UnsafeInMemorySorter does not
accept 0 as the initialSize,
+ // we will use 1 as its initial size if the map is empty.
+ int initialSoeterSize = map.numElements();
--- End diff --
Typo in this variable name.
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