Method ConstructSingularBuildSide

be/src/exec/nested-loop-join-node.cc:185–203

}

Status NestedLoopJoinNode::ConstructSingularBuildSide(RuntimeState* state) {
  // Optimized path for a common subplan shape with a singular row src node on the build
  // side that avoids expensive timers, virtual function calls, and other overhead.
  DCHECK(IsInSubplan());
  DCHECK_EQ(2, num_children());
  DCHECK_EQ(child(1)->type(), TPlanNodeType::type::SINGULAR_ROW_SRC_NODE);
  RowBatch* batch = builder_->GetNextEmptyBatch();
  bool eos;
  RETURN_IF_ERROR(child(1)->GetNext(state, batch, &eos));
  DCHECK_EQ(batch->num_rows(), 1);
  DCHECK(eos);
  DCHECK(!batch->needs_deep_copy());
  builder_->AddBuildBatch(batch);
  if (matching_build_rows_ != NULL) {
    DCHECK_EQ(matching_build_rows_->num_bits(), 1);
    matching_build_rows_->SetAllBits(false);
  }
  return Status::OK();
}

Status NestedLoopJoinNode::ResetMatchingBuildRows(RuntimeState* state, int64_t num_bits) {
  // Reuse existing bitmap, expanding it if needed.