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/**
* Copyright (C) 2021-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/pipeline/document_source_fill.h"
#include "mongo/db/pipeline/document_source_add_fields.h"
#include "mongo/db/pipeline/document_source_set_window_fields.h"
#include "mongo/db/pipeline/expression.h"
#include "mongo/db/pipeline/expression_context.h"
#include "mongo/db/pipeline/field_path.h"
#include "mongo/util/assert_util.h"
#include "mongo/util/visit_helper.h"
namespace mongo {
REGISTER_DOCUMENT_SOURCE_CONDITIONALLY(fill,
LiteParsedDocumentSourceDefault::parse,
document_source_fill::createFromBson,
AllowedWithApiStrict::kNeverInVersion1,
AllowedWithClientType::kAny,
multiversion::FeatureCompatibilityVersion::kVersion_5_2,
feature_flags::gFlagFill.isEnabledAndIgnoreFCV());
namespace document_source_fill {
std::list<boost::intrusive_ptr<DocumentSource>> createFromBson(
BSONElement elem, const boost::intrusive_ptr<ExpressionContext>& pExpCtx) {
uassert(ErrorCodes::FailedToParse,
str::stream() << "The " << kStageName
<< " stage specification must be an object, found "
<< typeName(elem.type()),
elem.type() == BSONType::Object);
auto spec = FillSpec::parse(IDLParserErrorContext(kStageName), elem.embeddedObject());
std::list<boost::intrusive_ptr<DocumentSource>> outputPipeline;
BSONObjBuilder setWindowFieldsSpec;
// Output object is not optional. Check output field first to maybe skip building the rest of
// the $setWindowFields spec.
auto&& outputFields = spec.getOutput();
uassert(6050203,
"The output field in '$fill' must contain an object with at least one element",
outputFields.nFields() > 0);
BSONObjBuilder setWindowFieldsOutputSpec(setWindowFieldsSpec.subobjStart("output"));
BSONObjBuilder addFieldsSpec;
bool needSetWindowFields = false;
for (const auto& fieldSpec : outputFields) {
// Each object is a fieldname with a single element object value.
StringData fieldName = fieldSpec.fieldName();
uassert(6050200,
"Each fill output specification must be an object with exactly one field",
fieldSpec.type() == BSONType::Object);
auto parsedSpec =
FillOutputSpec::parse(IDLParserErrorContext(kStageName), fieldSpec.embeddedObject());
if (auto&& method = parsedSpec.getMethod()) {
uassert(6050201,
"Each fill output specification must have exactly one of 'method' or 'value' "
"fields, not both",
!parsedSpec.getValue());
auto&& methodStr = method.value();
uassert(6050202,
str::stream() << "Method must be either " << kLocfMethod << " or "
<< kLinearInterpolateMethod,
methodStr == kLocfMethod || methodStr == kLinearInterpolateMethod);
auto&& fullMethodStr =
methodStr == kLinearInterpolateMethod ? "$" + methodStr + "Fill" : "$" + methodStr;
setWindowFieldsOutputSpec.append(fieldName, BSON(fullMethodStr << "$" + fieldName));
needSetWindowFields = true;
}
if (auto&& unparsedValueExpr = parsedSpec.getValue()) {
// Value fields are BSONAnyType.
auto valueObj = unparsedValueExpr.value().getElement().wrap(fieldName);
addFieldsSpec.appendElements(valueObj);
}
}
setWindowFieldsOutputSpec.done();
// Generate sortPattern for $setWindowFields
if (auto&& sortBy = spec.getSortBy()) {
setWindowFieldsSpec.append("sortBy", sortBy.value());
}
if (auto&& partitionByUnparsedExpr = spec.getPartitionBy()) {
uassert(6050204,
"Maximum one of 'partitionBy' and 'partitionByFields can be specified in '$fill'",
!spec.getPartitionByFields());
setWindowFieldsSpec.append("partitionBy", partitionByUnparsedExpr.value());
}
if (auto&& partitionByFields = spec.getPartitionByFields()) {
BSONObjBuilder partitionBySpec;
for (const auto& fieldName : partitionByFields.value()) {
partitionBySpec.append(fieldName, "$" + fieldName);
}
setWindowFieldsSpec.append("partitionBy", partitionBySpec.obj());
}
std::list<boost::intrusive_ptr<DocumentSource>> finalSources;
if (needSetWindowFields) {
auto finalSpec = BSON("$setWindowFields" << setWindowFieldsSpec.obj());
finalSources =
document_source_set_window_fields::createFromBson(finalSpec.firstElement(), pExpCtx);
}
auto finalAddFieldsSpec = addFieldsSpec.obj();
if (finalAddFieldsSpec.nFields() != 0) {
finalSources.push_back(
DocumentSourceAddFields::create(std::move(finalAddFieldsSpec), pExpCtx, "$addFields"));
}
return finalSources;
}
} // namespace document_source_fill
} // namespace mongo
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