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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