1 files changed, 119 insertions, 0 deletions
diff --git a/src/mongo/db/exec/sbe/util/stage_results_printer.cpp b/src/mongo/db/exec/sbe/util/stage_results_printer.cpp
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+++ b/src/mongo/db/exec/sbe/util/stage_results_printer.cpp
@@ -0,0 +1,119 @@
+/**
+ *    Copyright (C) 2022-present MongoDB, Inc.
+ *
+ *    This program is free software: you can redistribute it and/or modify
+ *    it under the terms of the Server Side Public License, version 1,
+ *    as published by MongoDB, Inc.
+ *
+ *    This program is distributed in the hope that it will be useful,
+ *    but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *    Server Side Public License for more details.
+ *
+ *    You should have received a copy of the Server Side Public License
+ *    along with this program. If not, see
+ *    <http://www.mongodb.com/licensing/server-side-public-license>.
+ *
+ *    As a special exception, the copyright holders give permission to link the
+ *    code of portions of this program with the OpenSSL library under certain
+ *    conditions as described in each individual source file and distribute
+ *    linked combinations including the program with the OpenSSL library. You
+ *    must comply with the Server Side Public License in all respects for
+ *    all of the code used other than as permitted herein. If you modify file(s)
+ *    with this exception, you may extend this exception to your version of the
+ *    file(s), but you are not obligated to do so. If you do not wish to do so,
+ *    delete this exception statement from your version. If you delete this
+ *    exception statement from all source files in the program, then also delete
+ *    it in the license file.
+ */
+
+#include "mongo/db/exec/sbe/util/stage_results_printer.h"
+#include "mongo/platform/basic.h"
+
+namespace mongo::sbe {
+
+template <typename T>
+StageResultsPrinter<T>::StageResultsPrinter(T& stream, const PrintOptions& options)
+    : _stream(stream),
+      _options(options),
+      _valuePrinter(value::ValuePrinters::make(stream, options)) {}
+
+template <typename T>
+void StageResultsPrinter<T>::printStageResults(CompileCtx* ctx,
+                                               const value::SlotVector& slots,
+                                               const std::vector<std::string>& names,
+                                               PlanStage* stage) {
+    tassert(6441701, "slots and names sizes must match", slots.size() == names.size());
+    SlotNames slotNames;
+    size_t idx = 0;
+    for (auto slot : slots) {
+        slotNames.emplace_back(slot, names[idx++]);
+    }
+
+    printStageResults(ctx, slotNames, stage);
+}
+
+template <typename T>
+void StageResultsPrinter<T>::printStageResults(CompileCtx* ctx,
+                                               const SlotNames& slotNames,
+                                               PlanStage* stage) {
+    std::vector<value::SlotAccessor*> accessors;
+    for (auto slot : slotNames) {
+        accessors.push_back(stage->getAccessor(*ctx, slot.first));
+    }
+
+    printSlotNames(slotNames);
+    _stream << ":"
+            << "\n";
+
+    size_t iter = 0;
+    for (auto st = stage->getNext(); st == PlanState::ADVANCED; st = stage->getNext(), iter++) {
+        if (iter >= _options.arrayObjectOrNestingMaxDepth()) {
+            _stream << "..."
+                    << "\n";
+            break;
+        }
+
+        bool first = true;
+        for (auto accessor : accessors) {
+            if (!first) {
+                _stream << ", ";
+            } else {
+                first = false;
+            }
+            auto [tag, val] = accessor->getViewOfValue();
+            _valuePrinter.writeValueToStream(tag, val);
+        }
+        _stream << "\n";
+    }
+}
+
+template <typename T>
+void StageResultsPrinter<T>::printSlotNames(const SlotNames& slotNames) {
+    _stream << "[";
+    bool first = true;
+    for (auto slot : slotNames) {
+        if (!first) {
+            _stream << ", ";
+        } else {
+            first = false;
+        }
+        _stream << slot.second;
+    }
+    _stream << "]";
+}
+
+template class StageResultsPrinter<std::ostream>;
+template class StageResultsPrinter<str::stream>;
+
+StageResultsPrinter<std::ostream> StageResultsPrinters::make(std::ostream& stream,
+                                                             const PrintOptions& options) {
+    return StageResultsPrinter(stream, options);
+}
+
+StageResultsPrinter<str::stream> StageResultsPrinters::make(str::stream& stream,
+                                                            const PrintOptions& options) {
+    return StageResultsPrinter(stream, options);
+}
+
+}  // namespace mongo::sbe