Package mondrian.rolap.sql

Interface TupleConstraint

All Superinterfaces:
SqlConstraint
All Known Implementing Classes:
DefaultTupleConstraint, MemberKeyConstraint, RolapNativeSet.SetConstraint, SqlContextConstraint
public interface TupleConstraint extends SqlConstraint
Restricts the SQL result of TupleReader. This is also used by SqlMemberSource#getMembersInLevel(RolapLevel, TupleConstraint).
Author:
av
See Also:

  • Method Details

    • addConstraint

      void addConstraint(SqlQuery sqlQuery, RolapCube baseCube, AggStar aggStar)
      Modifies a Level.Members query.
      Parameters:
      sqlQuery - the query to modify
      aggStar - aggregate star to use
      baseCube - base cube for virtual cube constraints

    • addLevelConstraint

      void addLevelConstraint(SqlQuery sqlQuery, RolapCube baseCube, AggStar aggStar, RolapLevel level)
      Will be called multiple times for every "group by" level in Level.Members query, i.e. the level that contains the members and all parent levels except All. If the condition requires so, it may join the levels table to the fact table.
      Parameters:
      sqlQuery - the query to modify
      baseCube - base cube for virtual cube constraints
      aggStar - Aggregate table, or null if query is against fact table
      level - the level which is accessed in the Level.Members query

    • getMemberChildrenConstraint

      MemberChildrenConstraint getMemberChildrenConstraint(RolapMember parent)
      When the members of a level are fetched, the result is grouped by into parents and their children. These parent/children are stored in the parent/children cache, whose key consists of the parent and the MemberChildrenConstraint#hashKey(). So we need a matching MemberChildrenConstraint to store the parent with its children into the parent/children cache.

      The returned MemberChildrenConstraint must be one that would have returned the same children for the given parent as the MemberLevel query has found for that parent.

      If null is returned, the parent/children will not be cached (but the level/members still will be).

    • getEvaluator

      Evaluator getEvaluator()
      Returns:
      the evaluator currently associated with the constraint; null if there is no associated evaluator

    • supportsAggTables

      boolean supportsAggTables()
      Returns:
      true if the constraint can leverage an aggregate table