DataSourceV2ScanExecBase Leaf Physical Operators¶

DataSourceV2ScanExecBase is an extension of LeafExecNode abstraction for leaf physical operators that track number of output rows when executed (with or without support for columnar reads).

Contract¶

Input Partitions¶

partitions: Seq[InputPartition]

Used when:

• DataSourceV2ScanExecBase is requested for the partitions, groupedPartitions, supportsColumnar

Input RDD¶

inputRDD: RDD[InternalRow]

keyGroupedPartitioning¶

keyGroupedPartitioning: Option[Seq[Expression]]

PartitionReaderFactory¶

readerFactory: PartitionReaderFactory

PartitionReaderFactory for partition readers (of the inputPartitions)

Used when:

• BatchScanExec physical operator is requested for an input RDD
• ContinuousScanExec and MicroBatchScanExec physical operators (from Spark Structured Streaming) are requested for an inputRDD
• DataSourceV2ScanExecBase physical operator is requested to outputPartitioning or supportsColumnar

Scan¶

scan: Scan

Scan

Implementations¶

• BatchScanExec
• ContinuousScanExec (Spark Structured Streaming)
• MicroBatchScanExec (Spark Structured Streaming)

Executing Physical Operator¶

doExecute(): RDD[InternalRow]

doExecute is part of the SparkPlan abstraction.

doExecute...FIXME

doExecuteColumnar¶

doExecuteColumnar(): RDD[ColumnarBatch]

doExecuteColumnar is part of the SparkPlan abstraction.

doExecuteColumnar...FIXME

Performance Metrics¶

metrics: Map[String, SQLMetric]

metrics is part of the SparkPlan abstraction.

metrics is the following SQLMetrics with the customMetrics:

Output Data Partitioning Requirements¶

outputPartitioning: physical.Partitioning

outputPartitioning is part of the SparkPlan abstraction.

outputPartitioning...FIXME

Simple Node Description¶

simpleString(
    maxFields: Int): String

simpleString is part of the TreeNode abstraction.

simpleString...FIXME

supportsColumnar¶

supportsColumnar: Boolean

supportsColumnar is part of the SparkPlan abstraction.

supportsColumnar is true if the PartitionReaderFactory can supportColumnarReads for all the inputPartitions. Otherwise, supportsColumnar is false.

supportsColumnar makes sure that either all the inputPartitions are supportColumnarReads or none, or throws an IllegalArgumentException:

Cannot mix row-based and columnar input partitions.

Custom Metrics¶

customMetrics: Map[String, SQLMetric]

customMetrics requests the Scan for supportedCustomMetrics that are then converted to SQLMetrics.

customMetrics is used when:

• DataSourceV2ScanExecBase is requested for the performance metrics
• BatchScanExec is requested for the inputRDD
• ContinuousScanExec is requested for the inputRDD
• MicroBatchScanExec is requested for the inputRDD (that creates a DataSourceRDD)