Github user JoshRosen commented on a diff in the pull request:
https://github.com/apache/spark/pull/6959#discussion_r33195681
--- Diff:
sql/catalyst/src/main/java/org/apache/spark/sql/catalyst/expressions/UnsafeFixedWidthAggregationMap.java
---
@@ -38,16 +38,28 @@
* An empty aggregation buffer, encoded in UnsafeRow format. When
inserting a new key into the
* map, we copy this buffer and use it as the value.
*/
- private final byte[] emptyAggregationBuffer;
+ private final byte[] emptyBuffer;
- private final StructType aggregationBufferSchema;
+ /**
+ * A empty row used by `initProjection`
--- End diff --
A -> An
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