abstract class OneToOneTTLState extends TTLState
OneToOneTTLState is an implementation of TTLState that is used to manage TTL for state variables that need a single secondary index to efficiently manage records with an expiration.
The primary index for state variables that can use a OneToOneTTLState have the form of: [elementKey -> (value, elementExpiration)]. You'll notice that, given a timestamp, it would take linear time to probe the primary index for all of its expired values.
As a result, this class uses helper methods from TTLState to maintain the secondary index from [(elementExpiration, elementKey) -> EMPTY_ROW].
For an explanation of why this structure is not always sufficient (e.g. why the class OneToManyTTLState is needed), please visit its class-doc comment.
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- new OneToOneTTLState(stateNameArg: String, storeArg: StateStore, elementKeySchemaArg: StructType, ttlConfigArg: TTLConfig, batchTimestampMsArg: Long, metricsArg: Map[String, SQLMetric])
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(Since version 9)