From 5273c2bad7df58c44afdd677609b8656f399a906 Mon Sep 17 00:00:00 2001
From: James Wahlin <james.wahlin@10gen.com>
Date: Wed, 5 Apr 2017 09:59:54 -0400
Subject: SERVER-28651 Move agg var ownership to ExpressionContext

---
 src/mongo/db/pipeline/document_source_redact.cpp | 27 ++++++++++++------------
 1 file changed, 14 insertions(+), 13 deletions(-)

(limited to 'src/mongo/db/pipeline/document_source_redact.cpp')

diff --git a/src/mongo/db/pipeline/document_source_redact.cpp b/src/mongo/db/pipeline/document_source_redact.cpp
index ae79729f2e0..738a55cc056 100644
--- a/src/mongo/db/pipeline/document_source_redact.cpp
+++ b/src/mongo/db/pipeline/document_source_redact.cpp
@@ -63,8 +63,9 @@ static const Value keepVal = Value("keep"_sd);
 DocumentSource::GetNextResult DocumentSourceRedact::getNext() {
     auto nextInput = pSource->getNext();
     for (; nextInput.isAdvanced(); nextInput = pSource->getNext()) {
-        _variables->setRoot(nextInput.getDocument());
-        _variables->setValue(_currentId, Value(nextInput.releaseDocument()));
+        auto& variables = pExpCtx->variables;
+        variables.setRoot(nextInput.getDocument());
+        variables.setValue(_currentId, Value(nextInput.releaseDocument()));
         if (boost::optional<Document> result = redactObject()) {
             return std::move(*result);
         }
@@ -99,7 +100,7 @@ Pipeline::SourceContainer::iterator DocumentSourceRedact::doOptimizeAt(
 Value DocumentSourceRedact::redactValue(const Value& in) {
     const BSONType valueType = in.getType();
     if (valueType == Object) {
-        _variables->setValue(_currentId, in);
+        pExpCtx->variables.setValue(_currentId, in);
         const boost::optional<Document> result = redactObject();
         if (result) {
             return Value(*result);
@@ -127,22 +128,23 @@ Value DocumentSourceRedact::redactValue(const Value& in) {
 }
 
 boost::optional<Document> DocumentSourceRedact::redactObject() {
-    const Value expressionResult = _expression->evaluate(_variables.get());
+    auto& variables = pExpCtx->variables;
+    const Value expressionResult = _expression->evaluate();
 
     ValueComparator simpleValueCmp;
     if (simpleValueCmp.evaluate(expressionResult == keepVal)) {
-        return _variables->getDocument(_currentId);
+        return variables.getDocument(_currentId);
     } else if (simpleValueCmp.evaluate(expressionResult == pruneVal)) {
         return boost::optional<Document>();
     } else if (simpleValueCmp.evaluate(expressionResult == descendVal)) {
-        const Document in = _variables->getDocument(_currentId);
+        const Document in = variables.getDocument(_currentId);
         MutableDocument out;
         out.copyMetaDataFrom(in);
         FieldIterator fields(in);
         while (fields.more()) {
             const Document::FieldPair field(fields.next());
 
-            // This changes CURRENT so don't read from _variables after this
+            // This changes CURRENT so don't read from variables after this
             const Value val = redactValue(field.second);
             if (!val.missing()) {
                 out.addField(field.first, val);
@@ -169,8 +171,7 @@ Value DocumentSourceRedact::serialize(boost::optional<ExplainOptions::Verbosity>
 
 intrusive_ptr<DocumentSource> DocumentSourceRedact::createFromBson(
     BSONElement elem, const intrusive_ptr<ExpressionContext>& expCtx) {
-    VariablesIdGenerator idGenerator;
-    VariablesParseState vps(&idGenerator);
+    VariablesParseState vps = expCtx->variablesParseState;
     Variables::Id currentId = vps.defineVariable("CURRENT");  // will differ from ROOT
     Variables::Id decendId = vps.defineVariable("DESCEND");
     Variables::Id pruneId = vps.defineVariable("PRUNE");
@@ -181,10 +182,10 @@ intrusive_ptr<DocumentSource> DocumentSourceRedact::createFromBson(
     // TODO figure out how much of this belongs in constructor and how much here.
     // Set up variables. Never need to reset DESCEND, PRUNE, or KEEP.
     source->_currentId = currentId;
-    source->_variables.reset(new Variables(idGenerator.getIdCount()));
-    source->_variables->setValue(decendId, descendVal);
-    source->_variables->setValue(pruneId, pruneVal);
-    source->_variables->setValue(keepId, keepVal);
+    auto& variables = expCtx->variables;
+    variables.setValue(decendId, descendVal);
+    variables.setValue(pruneId, pruneVal);
+    variables.setValue(keepId, keepVal);
 
 
     return source;
-- 
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