Class RolapNativeSet

  • Direct Known Subclasses:
    RolapNativeCrossJoin, RolapNativeFilter, RolapNativeTopCount

    public abstract class RolapNativeSet
    extends RolapNative
    Analyses set expressions and executes them in SQL if possible. Supports crossjoin, member.children, level.members and member.descendants - all in non empty mode, i.e. there is a join to the fact table.

    TODO: the order of the result is different from the order of the enumeration. Should sort.

    Since:
    Nov 12, 2005
    Author:
    av
    • Field Detail

      • LOGGER

        protected static final org.apache.logging.log4j.Logger LOGGER
    • Constructor Detail

      • RolapNativeSet

        public RolapNativeSet()
    • Method Detail

      • restrictMemberTypes

        protected abstract boolean restrictMemberTypes()
        Returns whether certain member types (e.g. calculated members) should disable native SQL evaluation for expressions containing them.

        If true, expressions containing calculated members will be evaluated by the interpreter, instead of using SQL.

        If false, calc members will be ignored and the computation will be done in SQL, returning more members than requested. This is ok, if the superflous members are filtered out in java code afterwards.

        Returns:
        whether certain member types should disable native SQL evaluation
      • isPreferInterpreter

        protected boolean isPreferInterpreter​(CrossJoinArg[] args,
                                              boolean joinArg)
        Tests whether non-native evaluation is preferred for the given arguments.
        Parameters:
        joinArg - true if evaluating a cross-join; false if evaluating a single-input expression such as filter
        Returns:
        true if all args prefer the interpreter
      • overrideContext

        protected void overrideContext​(RolapEvaluator evaluator,
                                       CrossJoinArg[] cargs,
                                       RolapStoredMeasure storedMeasure)
        Overrides current members in position by default members in hierarchies which are involved in this filter/topcount. Stores the RolapStoredMeasure into the context because that is needed to generate a cell request to constraint the sql.

        The current context may contain a calculated measure, this measure was translated into an sql condition (filter/topcount). The measure is not used to constrain the result but only to access the star.

        Parameters:
        evaluator - Evaluation context to modify
        cargs - Cross join arguments
        storedMeasure - Stored measure
        See Also:
        RolapAggregationManager.makeRequest(RolapEvaluator)
      • flushCache

        public void flushCache()