Interface ExecutableOperator

All Superinterfaces:
StatsProvider
All Known Subinterfaces:
BinaryExecutableOp, NaryExecutableOp, NullaryExecutableOp, UnaryExecutableOp
All Known Implementing Classes:
BaseForExecOpHashJoin, BaseForExecOpIndexNestedLoopsJoinWithRequestOps, BaseForExecOpIndexNestedLoopsJoinWithRequests, BaseForExecOpIndexNestedLoopsJoinWithSolMapsRequests, BaseForExecOpParallelBindJoin, BaseForExecOpParallelBindJoinSPARQL, BaseForExecOpRequest, BaseForExecOpRequestWithPaging, BaseForExecOpRequestWithTPFPaging, BaseForExecOps, BaseForExecOpSequentialBindJoin, BaseForExecOpSequentialBindJoinSPARQL, BaseForExecOpTriplesRequest, BaseForUnaryExecOpWithCollectedInput, BinaryExecutableOpBase, ExecOpBinaryUnion, ExecOpBind, ExecOpDuplicateRemoval, ExecOpFilter, ExecOpGlobalToLocal, ExecOpHashBasedMinus, ExecOpHashJoin1, ExecOpHashJoin2, ExecOpIndexNestedLoopsJoinSPARQL, ExecOpIndexNestedLoopsJoinTPF, ExecOpLocalToGlobal, ExecOpLookupJoinViaWrapperWithoutParamVars, ExecOpLookupJoinViaWrapperWithParamVars, ExecOpMultiRequest, ExecOpMultiwayUnion, ExecOpNaiveNestedLoopsJoin, ExecOpOrderBy, ExecOpParallelBindJoinSPARQLwithFILTER, ExecOpParallelBindJoinSPARQLwithUNION, ExecOpParallelBindJoinSPARQLwithVALUES, ExecOpParallelMultiwayLeftJoin, ExecOpProject, ExecOpRequestBRTPF, ExecOpRequestOther, ExecOpRequestSPARQL, ExecOpRequestTPF, ExecOpSequentialBindJoinBRTPF, ExecOpSequentialBindJoinSPARQLwithFILTER, ExecOpSequentialBindJoinSPARQLwithUNION, ExecOpSequentialBindJoinSPARQLwithVALUES, ExecOpSequentialBindJoinSPARQLwithVALUESorFILTER, ExecOpSequentialBindJoinSPARQLwithVarRenaming, ExecOpSymmetricHashJoin, ExecOpUnfold, NaryExecutableOpBase, NullaryExecutableOpBase, UnaryExecutableOpBase, UnaryExecutableOpBaseWithoutBlocking
public interface ExecutableOperator extends StatsProvider
An executable operator provides the implementation of the concrete algorithm that a physical operator is associated with. This interface is the top-level interface for all executable operators of HeFQUIN.

  • Method Details

    • getStats

      ExecutableOperatorStats getStats()
      Specified by:
      getStats in interface StatsProvider

    • getQueryPlanningInfo

      QueryPlanningInfo getQueryPlanningInfo()
      Returns the QueryPlanningInfo object that was populated for a physical plan whose root operator was the physical operator for which this executable operator was created.
      Returns:
      the QueryPlanningInfo object or null.

    • getExceptionsCaughtDuringExecution

      List<Exception> getExceptionsCaughtDuringExecution()
      Returns exceptions that were caught and collected during the execution of this operator (if any). If no exceptions were caught (which should be the normal case), then this function returns an empty list.

    • mayReduce

      boolean mayReduce()
      Indicates whether this executable operator is permitted (and potentially encouraged) to reduce duplicate solution mappings as part of its execution.

      If this method returns true, the operator may remove duplicate solution mappings if it has the capability to do so. If it returns false, the operator must preserve duplicates, even if it would otherwise be able to eliminate them.

      Returns:
      true if the operator may reduce duplicates; false otherwise.