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[SPARK-21884] [BACKPORT-2.2] [SPARK-21477] [SQL] Mark LocalTableScanExec's input data transient #19101

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[SPARK-21884] [BACKPORT-2.2] [SPARK-21477] [SQL] Mark LocalTableScanExec's input data transient #19101

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4 changes: 2 additions & 2 deletions 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 @@ -28,12 +28,12 @@ import org.apache.spark.sql.execution.metric.SQLMetrics
*/
case class LocalTableScanExec(
output: Seq[Attribute],
rows: Seq[InternalRow]) extends LeafExecNode {
@transient rows: Seq[InternalRow]) extends LeafExecNode {

override lazy val metrics = Map(
"numOutputRows" -> SQLMetrics.createMetric(sparkContext, "number of output rows"))

private lazy val unsafeRows: Array[InternalRow] = {
@transient private lazy val unsafeRows: Array[InternalRow] = {
if (rows.isEmpty) {
Array.empty
} else {
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8 changes: 8 additions & 0 deletions sql/core/src/test/scala/org/apache/spark/sql/execution/OptimizeMetadataOnlyQuerySuite.scala
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Expand Up @@ -117,4 +117,12 @@ class OptimizeMetadataOnlyQuerySuite extends QueryTest with SharedSQLContext {
"select partcol1, max(partcol2) from srcpart where partcol1 = 0 group by rollup (partcol1)",
"select partcol2 from (select partcol2 from srcpart where partcol1 = 0 union all " +
"select partcol2 from srcpart where partcol1 = 1) t group by partcol2")

test("SPARK-21884 Fix StackOverflowError on MetadataOnlyQuery") {
withTable("t_1000") {
sql("CREATE TABLE t_1000 (a INT, p INT) USING PARQUET PARTITIONED BY (p)")
(1 to 1000).foreach(p => sql(s"ALTER TABLE t_1000 ADD PARTITION (p=$p)"))
sql("SELECT COUNT(DISTINCT p) FROM t_1000").collect()
}
}
}