Package org.apache.drill.metastore.operate

Interface Metadata

All Known Implementing Classes:
IcebergMetadata, MongoMetadata, RdbmsMetadata
public interface Metadata
Provides Metastore component implementation metadata, including information about versioning support if any and current properties applicable to the Metastore component instance.

  • Field Summary

    Fields
    Modifier and Type
    Field
    Description
    static final int
    UNDEFINED
     

  • Method Summary

    Modifier and Type
    Method
    Description
    default Map<String,String>
    properties()
    Depending on Metastore component implementation, it may have properties.
    boolean
    supportsVersioning()
    Indicates if Metastore component supports versioning, i.e.
    default long
    version()
    Depending on Metastore component implementation, it may have version which can be used to determine if anything has changed during last call to the Metastore component.

  • Field Details

  • Method Details

    • supportsVersioning

      boolean supportsVersioning()
      Indicates if Metastore component supports versioning, i.e. Metastore component version is changed each time write operation is executed.
      Returns:
      true if Metastore component supports versioning, false otherwise

    • version

      default long version()
      Depending on Metastore component implementation, it may have version which can be used to determine if anything has changed during last call to the Metastore component. If Metastore component implementation, supports versioning, version is changed each time Metastore component data has changed. supportsVersioning() indicates if Metastore component supports versioning. If versioning is not supported, UNDEFINED is returned.
      Returns:
      current metastore version

    • properties

      default Map<String,String> properties()
      Depending on Metastore component implementation, it may have properties. If Metastore component supports properties, map with properties names and values are returned, otherwise empty map is returned.
      Returns:
      Metastore component implementation properties