bersprockets commented on code in PR #44099:
URL: https://github.com/apache/spark/pull/44099#discussion_r1411406390
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sql/catalyst/src/test/scala/org/apache/spark/sql/catalyst/expressions/aggregate/DeclarativeAggregateEvaluator.scala:
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@@ -17,24 +17,24 @@
package org.apache.spark.sql.catalyst.expressions.aggregate
import org.apache.spark.sql.catalyst.InternalRow
-import org.apache.spark.sql.catalyst.expressions.{Attribute, JoinedRow,
SafeProjection}
Review Comment:
`SafeProjection` works fine until the aggregation buffer contains more than
one field. In that case, if the second expression in the function's
`updateExpressions` looks back at the buffer's first field, that first field
may have already been changed by the first expression.
`MutableProjection`, on the other hand, keeps an intermediate results row,
so the current buffer is not affected until all expressions in
`updateExpressions` have been evaluated.
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