yiming.xu created SPARK-29284:
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Summary: df.distinct.count throw NoSuchElementException when
enabled daptive executor
Key: SPARK-29284
URL: https://issues.apache.org/jira/browse/SPARK-29284
Project: Spark
Issue Type: Bug
Components: SQL
Affects Versions: 2.4.4
Reporter: yiming.xu
This case:
spark.sql("SET spark.sql.adaptive.enabled=true")
spark.sql("SET spark.sql.shuffle.partitions=1")
val result = spark.range(0).distinct().count
or spark.table("empty table").distinct.count
throw java.util.NoSuchElementException: next on empty iterator
If current stage partition is
0,org.apache.spark.sql.execution.exchange.ExchangeCoordinator#doEstimationIfNecessary->partitionStartIndices
is empty (https://issues.apache.org/jira/browse/SPARK-22144)
next stage rdd partition is empty.
To solve the problem I will change partitionStartIndices to Array(0) when the
parent rdd partition is 0;
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