Policy (druid-processing 37.0.0 API)

All Known Implementing Classes:: NoRestrictionPolicy, RowFilterPolicy

public interface Policy

Extensible interface for a granular-level (e.x. row filter) restriction on read-table access. Implementations must be Jackson-serializable.

Method Summary

Modifier and Type

Method

Description

default SegmentPruner

createSegmentPruner()

CursorBuildSpec

visit(CursorBuildSpec spec)

Apply this policy to a CursorBuildSpec to seamlessly enforce policies for cursor-based queries.

Method Details
- visit
  
  CursorBuildSpec visit(CursorBuildSpec spec)
  
  Apply this policy to a CursorBuildSpec to seamlessly enforce policies for cursor-based queries. The application must encapsulate 100% of the requirements of this policy.
  Any transforms done to the spec must be sure to update CursorBuildSpec.getPhysicalColumns() and CursorBuildSpec.getVirtualColumns() as needed to ensure the underlying CursorHolder that is being restricted has accurate information about the set of required columns.
- createSegmentPruner
  
  @Nullable default SegmentPruner createSegmentPruner()
  
  Returns:
  
  a SegmentPruner which can be used to skip processing entire segments if it is possible to determine if the policy restricts access.