Github user nongli commented on a diff in the pull request:
https://github.com/apache/spark/pull/12345#discussion_r59649964
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/aggregate/ColumnarAggMapCodeGenerator.scala
---
@@ -21,10 +21,10 @@ import
org.apache.spark.sql.catalyst.expressions.codegen.CodegenContext
import org.apache.spark.sql.types.StructType
/**
- * This is a helper object to generate an append-only single-key/single
value aggregate hash
- * map that can act as a 'cache' for extremely fast key-value lookups
while evaluating aggregates
- * (and fall back to the `BytesToBytesMap` if a given key isn't found).
This is 'codegened' in
- * TungstenAggregate to speed up aggregates w/ key.
+ * This is a helper class to generate an append-only aggregate hash map
that can act as a 'cache'
+ * for extremely fast key-value lookups while evaluating aggregates (and
fall back to the
+ * `BytesToBytesMap` if a given key isn't found). This is 'codegened' in
TungstenAggregate to speed
+ * up aggregates w/ key.
--- End diff --
You chose to have this not handle null keys right? Comment that.
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