Github user davies commented on a diff in the pull request:
https://github.com/apache/spark/pull/10809#discussion_r50173654
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/codegen/GenerateUnsafeProjection.scala
---
@@ -288,22 +299,43 @@ object GenerateUnsafeProjection extends
CodeGenerator[Seq[Expression], UnsafePro
val exprEvals = ctx.generateExpressions(expressions,
useSubexprElimination)
val exprTypes = expressions.map(_.dataType)
+ val numVarLenFields = exprTypes.count {
--- End diff --
Since it's easy to grow the buffer, we don't need these optimization.
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