TableFeature¶

TableFeature is an abstraction of table features.

TableFeature is Serializable (Java).

Creating Instance¶

TableFeature takes the following to be created:

Abstract Class

TableFeature is an abstract class and cannot be created directly. It is created indirectly for the concrete TableFeatures.

name: String

The name of this table feature

The name can only be a combination of letters, -s (dashes) and _s (underscores).

Used when:

DeltaLog is requested to assertTableFeaturesMatchMetadata (for reporting purposes)
OptimisticTransactionImpl is requested to updateMetadataInternal and recordProtocolChanges
TableFeature is requested to allSupportedFeaturesMap
Protocol is requested to forTableFeature
TableFeatureSupport is requested to withFeature, canUpgradeTo, isFeatureSupported, propertyKey, defaultPropertyKey
DescribeDeltaDetailCommand is executed (and requested to describeDeltaTable)

requiredFeatures: Set[TableFeature]

The required TableFeatures that this TableFeature depends on

Default: (empty)

See:

Used when:

Sealed Abstract Class

TableFeature is a Scala sealed abstract class which means that all of the implementations are in the same compilation unit (a single file).

allSupportedFeaturesMap: Map[String, TableFeature]

allSupportedFeaturesMap is a collection of TableFeatures by their lower-case name:

allSupportedFeaturesMap is used when:

featureNameToFeature(
  featureName: String): Option[TableFeature]

featureNameToFeature tries to find the TableFeature by the given featureName in the allSupportedFeaturesMap.

featureNameToFeature is used when:

DeltaLog is requested to assertTableFeaturesMatchMetadata
OptimisticTransactionImpl is requested to updateMetadataInternal
Protocol is requested to extractAutomaticallyEnabledFeatures
TableFeatureSupport is requested for the implicitlyAndExplicitlySupportedFeatures
TableFeatureProtocolUtils is requested to getSupportedFeaturesFromTableConfigs