trait V1Scan extends Scan
A trait that should be implemented by V1 DataSources that would like to leverage the DataSource V2 read code paths.
This interface is designed to provide Spark DataSources time to migrate to DataSource V2 and will be removed in a future Spark release.
- Annotations
- @Unstable()
- Source
- V1Scan.java
- Since
3.0.0
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- V1Scan
- Scan
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Abstract Value Members
- abstract def readSchema(): StructType
Returns the actual schema of this data source scan, which may be different from the physical schema of the underlying storage, as column pruning or other optimizations may happen.
Returns the actual schema of this data source scan, which may be different from the physical schema of the underlying storage, as column pruning or other optimizations may happen.
- Definition Classes
- Scan
- abstract def toV1TableScan[T <: BaseRelation with TableScan](context: SQLContext): T
Create an
BaseRelationwithTableScanthat can scan data from DataSource v1 to RDD[Row].Create an
BaseRelationwithTableScanthat can scan data from DataSource v1 to RDD[Row].- Since
3.0.0
Concrete Value Members
- final def !=(arg0: Any): Boolean
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- final def ##: Int
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- final def ==(arg0: Any): Boolean
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- final def asInstanceOf[T0]: T0
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- def clone(): AnyRef
- Attributes
- protected[lang]
- Definition Classes
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- Annotations
- @throws(classOf[java.lang.CloneNotSupportedException]) @IntrinsicCandidate() @native()
- def columnarSupportMode(): ColumnarSupportMode
Subclasses can implement this method to indicate if the support for columnar data should be determined by each partition or is set as a default for the whole scan.
Subclasses can implement this method to indicate if the support for columnar data should be determined by each partition or is set as a default for the whole scan.
- Definition Classes
- Scan
- Since
3.5.0
- def description(): String
A description string of this scan, which may includes information like: what filters are configured for this scan, what's the value of some important options like path, etc.
A description string of this scan, which may includes information like: what filters are configured for this scan, what's the value of some important options like path, etc. The description doesn't need to include
#readSchema(), as Spark already knows it.By default this returns the class name of the implementation. Please override it to provide a meaningful description.
- Definition Classes
- Scan
- final def eq(arg0: AnyRef): Boolean
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- def equals(arg0: AnyRef): Boolean
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- final def getClass(): Class[_ <: AnyRef]
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- Annotations
- @IntrinsicCandidate() @native()
- def hashCode(): Int
- Definition Classes
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- Annotations
- @IntrinsicCandidate() @native()
- final def isInstanceOf[T0]: Boolean
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- final def ne(arg0: AnyRef): Boolean
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- final def notify(): Unit
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- @IntrinsicCandidate() @native()
- final def notifyAll(): Unit
- Definition Classes
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- Annotations
- @IntrinsicCandidate() @native()
- def reportDriverMetrics(): Array[CustomTaskMetric]
Returns an array of custom metrics which are collected with values at the driver side only.
Returns an array of custom metrics which are collected with values at the driver side only. Note that these metrics must be included in the supported custom metrics reported by
supportedCustomMetrics.- Definition Classes
- Scan
- Since
3.4.0
- def supportedCustomMetrics(): Array[CustomMetric]
Returns an array of supported custom metrics with name and description.
Returns an array of supported custom metrics with name and description. By default it returns empty array.
- Definition Classes
- Scan
- final def synchronized[T0](arg0: => T0): T0
- Definition Classes
- AnyRef
- def toBatch(): Batch
Returns the physical representation of this scan for batch query.
Returns the physical representation of this scan for batch query. By default this method throws exception, data sources must overwrite this method to provide an implementation, if the
Tablethat creates this scan returnsTableCapability#BATCH_READsupport in itsTable#capabilities().If the scan supports runtime filtering and implements
SupportsRuntimeFiltering, this method may be called multiple times. Therefore, implementations can cache some state to avoid planning the job twice.- Definition Classes
- Scan
- Exceptions thrown
- def toContinuousStream(checkpointLocation: String): ContinuousStream
Returns the physical representation of this scan for streaming query with continuous mode.
Returns the physical representation of this scan for streaming query with continuous mode. By default this method throws exception, data sources must overwrite this method to provide an implementation, if the
Tablethat creates this scan returnsTableCapability#CONTINUOUS_READsupport in itsTable#capabilities().- checkpointLocation
a path to Hadoop FS scratch space that can be used for failure recovery. Data streams for the same logical source in the same query will be given the same checkpointLocation.
- Definition Classes
- Scan
- Exceptions thrown
- def toMicroBatchStream(checkpointLocation: String): MicroBatchStream
Returns the physical representation of this scan for streaming query with micro-batch mode.
Returns the physical representation of this scan for streaming query with micro-batch mode. By default this method throws exception, data sources must overwrite this method to provide an implementation, if the
Tablethat creates this scan returnsTableCapability#MICRO_BATCH_READsupport in itsTable#capabilities().- checkpointLocation
a path to Hadoop FS scratch space that can be used for failure recovery. Data streams for the same logical source in the same query will be given the same checkpointLocation.
- Definition Classes
- Scan
- Exceptions thrown
- def toString(): String
- Definition Classes
- AnyRef → Any
- final def wait(arg0: Long, arg1: Int): Unit
- Definition Classes
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- Annotations
- @throws(classOf[java.lang.InterruptedException])
- final def wait(arg0: Long): Unit
- Definition Classes
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- Annotations
- @throws(classOf[java.lang.InterruptedException]) @native()
- final def wait(): Unit
- Definition Classes
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- Annotations
- @throws(classOf[java.lang.InterruptedException])
Deprecated Value Members
- def finalize(): Unit
- Attributes
- protected[lang]
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- Annotations
- @throws(classOf[java.lang.Throwable]) @Deprecated
- Deprecated
(Since version 9)