public MergeJoinExec(
TaskAttemptContext context,
JoinNode plan,
PhysicalExec outer,
PhysicalExec inner,
SortSpec[] outerSortKey,
SortSpec[] innerSortKey) {
super(context, plan.getInSchema(), plan.getOutSchema(), outer, inner);
Preconditions.checkArgument(
plan.hasJoinQual(),
"Sort-merge join is only used for the equi-join, " + "but there is no join condition");
this.joinNode = plan;
this.joinQual = plan.getJoinQual();
this.qualCtx = this.joinQual.newContext();
this.outerTupleSlots = new ArrayList<Tuple>(INITIAL_TUPLE_SLOT);
this.innerTupleSlots = new ArrayList<Tuple>(INITIAL_TUPLE_SLOT);
SortSpec[][] sortSpecs = new SortSpec[2][];
sortSpecs[0] = outerSortKey;
sortSpecs[1] = innerSortKey;
this.joincomparator = new JoinTupleComparator(outer.getSchema(), inner.getSchema(), sortSpecs);
this.tupleComparator =
PlannerUtil.getComparatorsFromJoinQual(
plan.getJoinQual(), outer.getSchema(), inner.getSchema());
this.outerIterator = outerTupleSlots.iterator();
this.innerIterator = innerTupleSlots.iterator();
// for projection
this.projector = new Projector(inSchema, outSchema, plan.getTargets());
this.evalContexts = projector.renew();
// for join
frameTuple = new FrameTuple();
outTuple = new VTuple(outSchema.getColumnNum());
}
