Update ExternalAppendOnlyUnsafeRowArray.scala

Author: cloud-fan

sql/core/src/main/scala/org/apache/spark/sql/execution/ExternalAppendOnlyUnsafeRowArray.scala

@@ -36,14 +36,14 @@ import org.apache.spark.util.collection.unsafe.sort.{UnsafeExternalSorter, Unsaf
  * An append-only array for [[UnsafeRow]]s that strictly keeps content in an in-memory array
  * until [[numRowsInMemoryBufferThreshold]] or [[sizeInBytesInMemoryBufferThreshold]] is reached
  * post which it will switch to a mode (backed by [[UnsafeExternalSorter]]) which would flush to
- * disk after [[numRowsSpillThreshold]] is met (or before if there is excessive memory consumption).
- * Setting these threshold involves following trade-offs:
+ * disk after [[numRowsSpillThreshold]] or [[sizeInBytesSpillThreshold]] is met (or before if there
+ * is excessive memory consumption). Setting these threshold involves following trade-offs:
  *
  * - If [[numRowsInMemoryBufferThreshold]] and [[sizeInBytesInMemoryBufferThreshold]] are too high,
  *   the in-memory array may occupy more memory than is available, resulting in OOM.
- * - If [[numRowsSpillThreshold]] is too low, data will be spilled frequently and lead to
- *   excessive disk writes. This may lead to a performance regression compared to the normal case
- *   of using an [[ArrayBuffer]] or [[Array]].
+ * - If [[numRowsSpillThreshold]] or [[sizeInBytesSpillThreshold]] is too low, data will be spilled
+ *   frequently and lead to excessive disk writes. This may lead to a performance regression compared
+ *   to the normal case of using an [[ArrayBuffer]] or [[Array]].
  */
 class ExternalAppendOnlyUnsafeRowArray(
     taskMemoryManager: TaskMemoryManager,