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[WIP][SPARK-29221][SQL] LocalTableScanExec: handle the case where executors are accessing "null" rows #25913

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[WIP][SPARK-29221][SQL] LocalTableScanExec: handle the case where executors are accessing "null" rows #25913

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[SPARK-29221][SQL] LocalTableScanExec: handle the case rows is "null"…
HeartSaVioR Sep 24, 2019
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HeartSaVioR Sep 25, 2019
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5 changes: 4 additions & 1 deletion sql/core/src/main/scala/org/apache/spark/sql/execution/LocalTableScanExec.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -37,6 +37,7 @@ case class LocalTableScanExec(
"numOutputRows" -> SQLMetrics.createMetric(sparkContext, "number of output rows"))

@transient private lazy val unsafeRows: Array[InternalRow] = {
assert(rows != null)
if (rows.isEmpty) {
Array.empty
} else {
Expand All @@ -59,7 +60,9 @@ case class LocalTableScanExec(
}

override protected def stringArgs: Iterator[Any] = {
if (rows.isEmpty) {
if (rows == null) {
Iterator("<unknown>", output)
} else if (rows.isEmpty) {
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@maropu maropu Sep 24, 2019

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Is it ok to return different values in a driver and executors? How about computing this value in a driver then passing into executors?

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@HeartSaVioR HeartSaVioR Sep 24, 2019 •
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The value except output should be meaningless, otherwise assumption in related comments goes wrong and we should serialize the rows. I guess that's only for visual.

Iterator("<empty>", output)
} else {
Iterator(output)
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