Eunjin Song created SPARK-49515:
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Summary: numInputRows is 0 when one of input relation is empty
Key: SPARK-49515
URL: https://issues.apache.org/jira/browse/SPARK-49515
Project: Spark
Issue Type: Bug
Components: Structured Streaming
Affects Versions: 3.4.0
Environment: Reproducible in Spark 3.4 , probably all versions after
introducing org.apache.spark.sql.catalyst.optimizer.PropagateEmptyRelation
Reporter: Eunjin Song
[https://github.com/apache/spark/blob/2ed6c3e511f322c5fd01953736c376a85ff2c687/sql/core/src/main/scala/org/apache/spark/sql/execution/streaming/ProgressReporter.scala#L481]
In case # relation of logical plan != # relation of physical plan,
numInputRows captured as 0 for all sources. However it includes the case that
empty relations in union is removed from physical plan by
"org.apache.spark.sql.catalyst.optimizer.PropagateEmptyRelation".
Repro code:
import org.apache.spark.sql.streaming.Trigger
val df1 = spark.readStream.schema(sch).parquet("/streaming/parquet1")
val df2 = spark.readStream.schema(sch).parquet("/streaming/emptyparquet")
df1.union(df2).writeStream.option("checkpointLocation",
"/streaming/checkpoint8").format("parquet").trigger(Trigger.Once()).option("path",
"/streaming/result9").start
workaround:
spark.conf.set("spark.sql.optimizer.excludedRules","org.apache.spark.sql.catalyst.optimizer.PropagateEmptyRelation")
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