StreamingRelationExec Leaf Physical Operator¶

StreamingRelationExec is a leaf physical operator (i.e. LeafExecNode) that...FIXME

[source, scala]¶

scala> spark.version res0: String = 2.3.0-SNAPSHOT

val rates = spark. readStream. format("rate"). load

// StreamingRelation logical operator scala> println(rates.queryExecution.logical.numberedTreeString) 00 StreamingRelation DataSource(org.apache.spark.sql.SparkSession@31ba0af0,rate,List(),None,List(),None,Map(),None), rate, [timestamp#0, value#1L]

// StreamingRelationExec physical operator (shown without "Exec" suffix) scala> rates.explain == Physical Plan == StreamingRelation rate, [timestamp#0, value#1L]

[[doExecute]] StreamingRelationExec is not supposed to be executed and is used...FIXME

=== [[creating-instance]] Creating StreamingRelationExec Instance

StreamingRelationExec takes the following when created:

• [[sourceName]] The name of a streaming source
• [[output]] Output attributes

StreamingRelationExec is created when StreamingRelationStrategy execution planning strategy is executed (to plan StreamingRelation and StreamingExecutionRelation logical operators).