/**
* @param args
* @param annotations
*/
public HashJoinOp(final BOp[] args, final Map<String, Object> annotations) {
super(args, annotations);
/*
* Validate common requirements for all concrete implementations of this
* operator.
*/
switch (getEvaluationContext()) {
case CONTROLLER:
case SHARDED:
case HASHED:
break;
default:
throw new UnsupportedOperationException(
Annotations.EVALUATION_CONTEXT + "=" + getEvaluationContext());
}
// Predicate for the access path must be specified.
getPredicate();
getRequiredProperty(Annotations.NAMED_SET_REF);
// Join variables must be specified.
final IVariable<?>[] joinVars = (IVariable[]) getRequiredProperty(Annotations.JOIN_VARS);
// if (joinVars.length == 0)
// throw new IllegalArgumentException(Annotations.JOIN_VARS);
for (IVariable<?> var : joinVars) {
if (var == null) throw new IllegalArgumentException(Annotations.JOIN_VARS);
}
}
public ChunkTask(final BOpContext<IBindingSet> context, final HashJoinOp<E> op) {
this.context = context;
this.stats = (BaseJoinStats) context.getStats();
this.pred = op.getPredicate();
this.relation = context.getRelation(pred);
this.sink = context.getSink();
this.sink2 = context.getSink2();
this.op = op;
{
/*
* First, see if the map already exists.
*
* Note: Since the operator is not thread-safe, we do not need
* to use a putIfAbsent pattern here.
*
* Note: Publishing the [state] as a query attribute provides
* visibility into the hash join against the access path even
* for implementations (such as the JVMHashJoinOp) where the
* entire operation will occur within a single evaluation pass.
*/
final INamedSolutionSetRef namedSetRef =
(INamedSolutionSetRef) op.getRequiredProperty(Annotations.NAMED_SET_REF);
// Lookup the attributes for the query on which we will hang the
// solution set.
final IQueryAttributes attrs = context.getQueryAttributes(namedSetRef.getQueryId());
IHashJoinUtility state = (IHashJoinUtility) attrs.get(namedSetRef);
if (state == null) {
state =
op.newState(
context,
namedSetRef,
op.isOptional() ? JoinTypeEnum.Optional : JoinTypeEnum.Normal);
attrs.put(namedSetRef, state);
}
this.state = state;
}
}