Package org.apache.druid.segment.metadata

Interface Summary

Interface	Description
AbstractSegmentMetadataCache.ColumnTypeMergePolicy	ColumnTypeMergePolicy defines the rules of which type to use when faced with the possibility of different types for the same column from segment to segment.

Class Summary

Class	Description
AbstractSegmentMetadataCache<T extends DataSourceInformation>	An abstract class that listens for segment change events and caches segment metadata.
AbstractSegmentMetadataCache.FirstTypeMergePolicy	Classic logic, we use the first type we encounter.
AbstractSegmentMetadataCache.LeastRestrictiveTypeMergePolicy	Resolves types using ColumnType.leastRestrictiveType(ColumnType, ColumnType) to find the ColumnType that can best represent all data contained across all segments.
AvailableSegmentMetadata	Immutable representation of RowSignature and other segment attributes.
AvailableSegmentMetadata.Builder
CentralizedDatasourceSchemaConfig	Config for centralizing datasource schema management in Coordinator.
CoordinatorSegmentMetadataCache	Coordinator-side cache of segment metadata that combines segments to build datasources.
DataSourceInformation	Encapsulates information about a datasource, such as its schema.
SegmentMetadataCacheConfig	Coordinator-side configuration class for customizing properties related to the SegmentMetadata cache.
SegmentMetadataQuerySegmentWalker	This QuerySegmentWalker implementation is specific to SegmentMetadata queries executed by CoordinatorSegmentMetadataCache and is in parity with CachingClusteredClient.