trait Batch extends AnyRef
A physical representation of a data source scan for batch queries. This interface is used to provide physical information, like how many partitions the scanned data has, and how to read records from the partitions.
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- Batch.java
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3.0.0
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- abstract def createReaderFactory(): PartitionReaderFactory
Returns a factory to create a
PartitionReaderfor eachInputPartition. - abstract def planInputPartitions(): Array[InputPartition]
Returns a list of
input partitions.Returns a list of
input partitions. EachInputPartitionrepresents a data split that can be processed by one Spark task. The number of input partitions returned here is the same as the number of RDD partitions this scan outputs.If the
Scansupports filter pushdown, this Batch is likely configured with a filter and is responsible for creating splits for that filter, which is not a full scan.This method will be called only once during a data source scan, to launch one Spark job.
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(Since version 9)