Github user davies commented on a diff in the pull request:
https://github.com/apache/spark/pull/6959#discussion_r33418937
--- Diff:
sql/catalyst/src/main/java/org/apache/spark/sql/catalyst/expressions/UnsafeFixedWidthAggregationMap.java
---
@@ -55,9 +67,19 @@
private final BytesToBytesMap map;
/**
+ * A object pool for these in keys.
+ */
+ private final UniqueObjectPool keyPool;
+
+ /**
+ * A object pool for those in aggregation buffers.
+ */
+ private final ObjectPool bufferPool;
--- End diff --
The type is already `ObjectPool`, having the full name in the variable
name is too verbose, I think.
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