Github user kiszk commented on a diff in the pull request:
https://github.com/apache/spark/pull/11636#discussion_r56728827
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/ExistingRDD.scala ---
@@ -217,9 +222,14 @@ private[sql] case class DataSourceScan(
// TODO: The abstractions between this class and SqlNewHadoopRDD makes
it difficult to know
// here which path to use. Fix this.
- ctx.INPUT_ROW = row
ctx.currentVars = null
- val columns1 = exprs.map(_.gen(ctx))
+ val colVars = output.zipWithIndex.map(x => ctx.freshName("col" + x._2))
+ val colDeclarations = colVars.zipWithIndex.map(x => {
+ (columnVectorClz + " " + x._1 + " = " + batch + ".column(" + x._2 +
");\n").trim} )
--- End diff --
I see. I misunderstood your comment. You wanted to avoid declaration of
variables `col0`, `col1`, ...
@nongli suggested "Move this to before the while loop (the contract is that
the batch object is reused)". I will put a comment for this loop invariant
hoisting for performance optimization.
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