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fixes for explainer and condition

This commit is contained in:
Jan Steemann 2015-10-08 16:22:52 +02:00
parent c6c6ba8f6f
commit 6a4e9658c5
5 changed files with 268 additions and 199 deletions
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5
arangod/Aql/AstNode.h
View File

@ -667,7 +667,10 @@ namespace triagens {
////////////////////////////////////////////////////////////////////////////////
inline AstNode* getMemberUnchecked (size_t i) const throw() {
return members.at(i);
#ifdef TRI_ENABLE_MAINTAINER_MODE
TRI_ASSERT(i < members.size());
#endif
return members[i];
}
////////////////////////////////////////////////////////////////////////////////

391
arangod/Aql/Condition.cpp
View File

@ -426,50 +426,58 @@ ConditionPart::ConditionPartCompareResult const ConditionPart::ResultsTable[3][7
}
};
void Condition::optimize (ExecutionPlan* plan) {
typedef std::vector<std::pair<size_t, AttributeSideType>> UsagePositionType;
typedef std::unordered_map<std::string, UsagePositionType> AttributeUsageType;
typedef std::unordered_map<Variable const*, AttributeUsageType> VariableUsageType;
auto storeAttributeAccess = [] (VariableUsageType& variableUsage, AstNode const* node, size_t position, AttributeSideType side) {
std::pair<Variable const*, std::vector<triagens::basics::AttributeName>> result;
if (! node->isAttributeAccessForVariable(result)) {
return;
}
auto variable = result.first;
////////////////////////////////////////////////////////////////////////////////
/// @brief registers an attribute access for a particular (collection) variable
////////////////////////////////////////////////////////////////////////////////
if (variable != nullptr) {
auto it = variableUsage.find(variable);
void Condition::storeAttributeAccess (VariableUsageType& variableUsage,
AstNode const* node,
size_t position,
AttributeSideType side) {
if (it == variableUsage.end()) {
// nothing recorded yet for variable
it = variableUsage.emplace(variable, AttributeUsageType()).first;
}
std::string attributeName;
TRI_AttributeNamesToString(result.second, attributeName, false);
auto it2 = (*it).second.find(attributeName);
std::pair<Variable const*, std::vector<triagens::basics::AttributeName>> result;
if (it2 == (*it).second.end()) {
// nothing recorded yet for attribute name in this variable
it2 = (*it).second.emplace(attributeName, UsagePositionType()).first;
}
auto& dst = (*it2).second;
if (! node->isAttributeAccessForVariable(result)) {
return;
}
auto variable = result.first;
if (! dst.empty() && dst.back().first == position) {
// already have this attribute for this variable. can happen in case a condition refers to itself (e.g. a.x == a.x)
// in this case, we won't optimize it
dst.erase(dst.begin() + dst.size() - 1);
}
else {
dst.emplace_back(position, side);
}
if (variable != nullptr) {
auto it = variableUsage.find(variable);
if (it == variableUsage.end()) {
// nothing recorded yet for variable
it = variableUsage.emplace(variable, AttributeUsageType()).first;
}
};
std::string attributeName;
TRI_AttributeNamesToString(result.second, attributeName, false);
auto it2 = (*it).second.find(attributeName);
if (it2 == (*it).second.end()) {
// nothing recorded yet for attribute name in this variable
it2 = (*it).second.emplace(attributeName, UsagePositionType()).first;
}
auto& dst = (*it2).second;
if (! dst.empty() && dst.back().first == position) {
// already have this attribute for this variable. can happen in case a condition refers to itself (e.g. a.x == a.x)
// in this case, we won't optimize it
dst.erase(dst.begin() + dst.size() - 1);
}
else {
dst.emplace_back(position, side);
}
}
}
////////////////////////////////////////////////////////////////////////////////
/// @brief optimize the condition expression tree
////////////////////////////////////////////////////////////////////////////////
void Condition::optimize (ExecutionPlan* plan) {
if (_root == nullptr) {
return;
}
@ -478,13 +486,15 @@ void Condition::optimize (ExecutionPlan* plan) {
TRI_ASSERT(_root->type == NODE_TYPE_OPERATOR_NARY_OR);
// handle sub nodes or top-level OR node
size_t const n = _root->numMembers();
size_t n = _root->numMembers();
size_t r = 0;
for (size_t i = 0; i < n; ++i) { // foreach OR-Node
auto andNode = _root->getMemberUnchecked(i);
while (r < n) { // foreach OR-Node
bool retry = false;
auto andNode = _root->getMemberUnchecked(r);
TRI_ASSERT(andNode->type == NODE_TYPE_OPERATOR_NARY_AND);
restartThisOrItem:
restartThisOrItem:
size_t const andNumMembers = andNode->numMembers();
// deduplicate all IN arrays
@ -492,6 +502,14 @@ void Condition::optimize (ExecutionPlan* plan) {
deduplicateInOperation(andNode->getMemberUnchecked(j));
}
if (andNumMembers <= 1) {
// simple AND item with 0 or 1 members. nothing to do
++r;
continue;
}
TRI_ASSERT(andNumMembers > 1);
// move IN operation to the front to make comparison code below simpler
andNode->sortMembers([] (AstNode const* lhs, AstNode const* rhs) -> bool {
if (lhs->type == NODE_TYPE_OPERATOR_BINARY_IN) {
@ -506,173 +524,178 @@ void Condition::optimize (ExecutionPlan* plan) {
return (lhs < rhs); // compare pointers to have a deterministic order
});
if (andNumMembers > 1) {
// optimization is only necessary if an AND node has multiple members
VariableUsageType variableUsage;
// optimization is only necessary if an AND node has multiple members
VariableUsageType variableUsage;
for (size_t j = 0; j < andNumMembers; ++j) {
auto operand = andNode->getMemberUnchecked(j);
for (size_t j = 0; j < andNumMembers; ++j) {
auto operand = andNode->getMemberUnchecked(j);
if (operand->isComparisonOperator()) {
auto lhs = operand->getMember(0);
auto rhs = operand->getMember(1);
if (operand->isComparisonOperator()) {
auto lhs = operand->getMember(0);
auto rhs = operand->getMember(1);
if (lhs->type == NODE_TYPE_ATTRIBUTE_ACCESS) {
storeAttributeAccess(variableUsage, lhs, j, ATTRIBUTE_LEFT);
}
if (rhs->type == NODE_TYPE_ATTRIBUTE_ACCESS ||
rhs->type == NODE_TYPE_EXPANSION) {
storeAttributeAccess(variableUsage, rhs, j, ATTRIBUTE_RIGHT);
}
if (lhs->type == NODE_TYPE_ATTRIBUTE_ACCESS) {
storeAttributeAccess(variableUsage, lhs, j, ATTRIBUTE_LEFT);
}
if (rhs->type == NODE_TYPE_ATTRIBUTE_ACCESS ||
rhs->type == NODE_TYPE_EXPANSION) {
storeAttributeAccess(variableUsage, rhs, j, ATTRIBUTE_RIGHT);
}
}
}
// now find the variables and attributes for which there are multiple conditions
for (auto const& it : variableUsage) { // foreach sub-and-node
auto variable = it.first;
// now find the variables and attributes for which there are multiple conditions
for (auto const& it : variableUsage) { // foreach sub-and-node
auto variable = it.first;
for (auto const& it2 : it.second) { // cross compare sub-and-nodes
auto const& attributeName = it2.first;
auto const& positions = it2.second;
for (auto const& it2 : it.second) { // cross compare sub-and-nodes
auto const& attributeName = it2.first;
auto const& positions = it2.second;
if (positions.size() <= 1) {
// none or only one occurence of the attribute
if (positions.size() <= 1) {
// none or only one occurence of the attribute
continue;
}
// multiple occurrences of the same attribute
auto leftNode = andNode->getMemberUnchecked(positions[0].first);
ConditionPart current(variable, attributeName, 0, leftNode, positions[0].second);
if (! current.valueNode->isConstant()) {
continue;
}
// current.dump();
size_t j = 1;
while (j < positions.size()) {
auto rightNode = andNode->getMemberUnchecked(positions[j].first);
ConditionPart other(variable, attributeName, j, rightNode, positions[j].second);
if (! other.valueNode->isConstant()) {
++j;
continue;
}
// multiple occurrences of the same attribute
auto leftNode = andNode->getMemberUnchecked(positions[0].first);
// IN-merging
if (leftNode->type == NODE_TYPE_OPERATOR_BINARY_IN &&
leftNode->getMemberUnchecked(1)->isConstant()) {
TRI_ASSERT(leftNode->numMembers() == 2);
ConditionPart current(variable, attributeName, 0, leftNode, positions[0].second);
if (rightNode->type == NODE_TYPE_OPERATOR_BINARY_IN &&
rightNode->getMemberUnchecked(1)->isConstant()) {
// merge IN with IN on same attribute
TRI_ASSERT(rightNode->numMembers() == 2);
if (! current.valueNode->isConstant()) {
continue;
}
// current.dump();
size_t j = 1;
while (j < positions.size()) {
auto rightNode = andNode->getMemberUnchecked(positions[j].first);
ConditionPart other(variable, attributeName, j, rightNode, positions[j].second);
if (! other.valueNode->isConstant()) {
++j;
continue;
}
// IN-merging
if (leftNode->type == NODE_TYPE_OPERATOR_BINARY_IN &&
leftNode->getMemberUnchecked(1)->isConstant()) {
TRI_ASSERT(leftNode->numMembers() == 2);
if (rightNode->type == NODE_TYPE_OPERATOR_BINARY_IN &&
rightNode->getMemberUnchecked(1)->isConstant()) {
// merge IN with IN on same attribute
TRI_ASSERT(rightNode->numMembers() == 2);
auto merged = _ast->createNodeBinaryOperator(
auto merged = _ast->createNodeBinaryOperator(
NODE_TYPE_OPERATOR_BINARY_IN,
leftNode->getMemberUnchecked(0),
mergeInOperations(leftNode, rightNode)
);
andNode->removeMemberUnchecked(positions[j].first);
andNode->changeMember(positions[0].first, merged);
goto restartThisOrItem;
}
else if (rightNode->isSimpleComparisonOperator()) {
// merge other comparison operator with IN
TRI_ASSERT(rightNode->numMembers() == 2);
auto inNode = _ast->createNodeArray();
auto values = leftNode->getMemberUnchecked(1);
for (size_t k = 0; k < values->numMembers(); ++k) {
auto value = values->getMemberUnchecked(k);
ConditionPart::ConditionPartCompareResult res = ConditionPart::ResultsTable
[CompareAstNodes(value, other.valueNode, false) + 1]
[0 /*NODE_TYPE_OPERATOR_BINARY_EQ*/]
[other.whichCompareOperation()];
bool const keep = (res == CompareResult::OTHER_CONTAINED_IN_SELF || res == CompareResult::CONVERT_EQUAL);
if (keep) {
inNode->addMember(value);
}
}
if (inNode->numMembers() == 0) {
// no values left after merging -> IMPOSSIBLE
_root->removeMemberUnchecked(i);
goto fastForwardToNextOrItem;
}
// use the new array of values
andNode->getMemberUnchecked(positions[0].first)->changeMember(1, inNode);
// remove the other operator
andNode->removeMemberUnchecked(positions[j].first);
goto restartThisOrItem;
}
);
andNode->removeMemberUnchecked(positions[j].first);
andNode->changeMember(positions[0].first, merged);
goto restartThisOrItem;
}
// end of IN-merging
else if (rightNode->isSimpleComparisonOperator()) {
// merge other comparison operator with IN
TRI_ASSERT(rightNode->numMembers() == 2);
// Results are -1, 0, 1, move to 0, 1, 2 for the lookup:
ConditionPart::ConditionPartCompareResult res = ConditionPart::ResultsTable
[CompareAstNodes(current.valueNode, other.valueNode, false) + 1]
[current.whichCompareOperation()]
[other.whichCompareOperation()];
auto inNode = _ast->createNodeArray();
auto values = leftNode->getMemberUnchecked(1);
switch (res) {
case CompareResult::IMPOSSIBLE: {
// impossible condition
// j = positions.size();
// we remove this one, so fast forward the loops to their end:
_root->removeMemberUnchecked(i);
/// i -= 1; <- wenn wir das ohne goto machen...
for (size_t k = 0; k < values->numMembers(); ++k) {
auto value = values->getMemberUnchecked(k);
ConditionPart::ConditionPartCompareResult res = ConditionPart::ResultsTable
[CompareAstNodes(value, other.valueNode, false) + 1]
[0 /*NODE_TYPE_OPERATOR_BINARY_EQ*/]
[other.whichCompareOperation()];
bool const keep = (res == CompareResult::OTHER_CONTAINED_IN_SELF || res == CompareResult::CONVERT_EQUAL);
if (keep) {
inNode->addMember(value);
}
}
if (inNode->numMembers() == 0) {
// no values left after merging -> IMPOSSIBLE
_root->removeMemberUnchecked(r);
retry = true;
goto fastForwardToNextOrItem;
}
case CompareResult::SELF_CONTAINED_IN_OTHER: {
std::cout << "SELF IS CONTAINED IN OTHER\n";
andNode->removeMemberUnchecked(positions[0].first);
goto restartThisOrItem;
}
case CompareResult::OTHER_CONTAINED_IN_SELF: {
std::cout << "OTHER IS CONTAINED IN SELF\n";
andNode->removeMemberUnchecked(positions[j].first);
goto restartThisOrItem;
}
case CompareResult::CONVERT_EQUAL: { /// beide gehen, werden umgeformt zu a == x (== y)
andNode->removeMemberUnchecked(positions[j].first);
auto origNode = andNode->getMemberUnchecked(positions[0].first);
auto newNode = plan->getAst()->createNode(NODE_TYPE_OPERATOR_BINARY_EQ);
for (size_t iMemb = 0; iMemb < origNode->numMembers(); iMemb++) {
newNode->addMember(origNode->getMemberUnchecked(iMemb));
}
andNode->changeMember(positions[0].first, newNode);
std::cout << "RESULT equals X/Y\n";
break;
}
case CompareResult::DISJOINT: {
break;
}
case CompareResult::UNKNOWN: {
std::cout << "UNKNOWN\n";
break;
}
// use the new array of values
andNode->getMemberUnchecked(positions[0].first)->changeMember(1, inNode);
// remove the other operator
andNode->removeMemberUnchecked(positions[j].first);
goto restartThisOrItem;
}
++j;
}
} // cross compare sub-and-nodes
} // foreach sub-and-node
// end of IN-merging
fastForwardToNextOrItem:
continue;
// Results are -1, 0, 1, move to 0, 1, 2 for the lookup:
ConditionPart::ConditionPartCompareResult res = ConditionPart::ResultsTable
[CompareAstNodes(current.valueNode, other.valueNode, false) + 1]
[current.whichCompareOperation()]
[other.whichCompareOperation()];
switch (res) {
case CompareResult::IMPOSSIBLE: {
// impossible condition
// j = positions.size();
// we remove this one, so fast forward the loops to their end:
_root->removeMemberUnchecked(r);
retry = true;
goto fastForwardToNextOrItem;
}
case CompareResult::SELF_CONTAINED_IN_OTHER: {
std::cout << "SELF IS CONTAINED IN OTHER\n";
andNode->removeMemberUnchecked(positions[0].first);
goto restartThisOrItem;
}
case CompareResult::OTHER_CONTAINED_IN_SELF: {
std::cout << "OTHER IS CONTAINED IN SELF\n";
andNode->removeMemberUnchecked(positions[j].first);
goto restartThisOrItem;
}
case CompareResult::CONVERT_EQUAL: { /// beide gehen, werden umgeformt zu a == x (== y)
andNode->removeMemberUnchecked(positions[j].first);
auto origNode = andNode->getMemberUnchecked(positions[0].first);
auto newNode = plan->getAst()->createNode(NODE_TYPE_OPERATOR_BINARY_EQ);
for (size_t iMemb = 0; iMemb < origNode->numMembers(); iMemb++) {
newNode->addMember(origNode->getMemberUnchecked(iMemb));
}
andNode->changeMember(positions[0].first, newNode);
std::cout << "RESULT equals X/Y\n";
break;
}
case CompareResult::DISJOINT: {
break;
}
case CompareResult::UNKNOWN: {
std::cout << "UNKNOWN\n";
break;
}
}
++j;
}
} // cross compare sub-and-nodes
} // foreach sub-and-node
fastForwardToNextOrItem:
if (retry) {
// number of root sub-nodes has probably changed.
// now recalculate the number and don't modify r!
n = _root->numMembers();
}
else {
// root nodes hasn't changed. go to next sub-node!
++r;
}
}
}
////////////////////////////////////////////////////////////////////////////////
@ -853,7 +876,7 @@ AstNode* Condition::transformNode (AstNode* node) {
node->changeMember(0, transformNode(sub));
// fallthrough intentional
}
return node;
}

19
arangod/Aql/Condition.h
View File

@ -125,6 +125,16 @@ namespace triagens {
class Condition {
// -----------------------------------------------------------------------------
// --SECTION-- private typedefs
// -----------------------------------------------------------------------------
private:
typedef std::vector<std::pair<size_t, AttributeSideType>> UsagePositionType;
typedef std::unordered_map<std::string, UsagePositionType> AttributeUsageType;
typedef std::unordered_map<Variable const*, AttributeUsageType> VariableUsageType;
// -----------------------------------------------------------------------------
// --SECTION-- constructors / destructors
// -----------------------------------------------------------------------------
@ -211,6 +221,15 @@ namespace triagens {
void normalize (ExecutionPlan* plan);
////////////////////////////////////////////////////////////////////////////////
/// @brief registers an attribute access for a particular (collection) variable
////////////////////////////////////////////////////////////////////////////////
void storeAttributeAccess (VariableUsageType&,
AstNode const*,
size_t,
AttributeSideType);
////////////////////////////////////////////////////////////////////////////////
/// @brief optimize the condition expression tree
////////////////////////////////////////////////////////////////////////////////

25
js/apps/system/_admin/aardvark/APP/frontend/js/modules/org/arangodb/aql/explainer.js
View File

@ -191,7 +191,7 @@ function printIndexes (indexes) {
stringBuilder.appendLine(" " + value("none"));
}
else {
var maxIdLen = String("Id").length;
var maxIdLen = String("By").length;
var maxCollectionLen = String("Collection").length;
var maxUniqueLen = String("Unique").length;
var maxSparseLen = String("Sparse").length;
@ -216,7 +216,7 @@ function printIndexes (indexes) {
maxCollectionLen = l;
}
});
var line = " " + pad(1 + maxIdLen - String("Id").length) + header("Id") + " " +
var line = " " + pad(1 + maxIdLen - String("By").length) + header("By") + " " +
header("Type") + pad(1 + maxTypeLen - "Type".length) + " " +
header("Collection") + pad(1 + maxCollectionLen - "Collection".length) + " " +
header("Unique") + pad(1 + maxUniqueLen - "Unique".length) + " " +
@ -232,7 +232,13 @@ function printIndexes (indexes) {
var sparsity = (indexes[i].hasOwnProperty("sparse") ? (indexes[i].sparse ? "true" : "false") : "n/a");
var fields = indexes[i].fields.map(attribute).join(", ");
var fieldsLen = indexes[i].fields.map(attributeUncolored).join(", ").length;
var ranges = "[ " + indexes[i].ranges + " ]";
var ranges;
if (indexes[i].hasOwnProperty("condition")) {
ranges = indexes[i].condition;
}
else {
ranges = "[ " + indexes[i].ranges + " ]";
}
var selectivity = (indexes[i].hasOwnProperty("selectivityEstimate") ?
(indexes[i].selectivityEstimate * 100).toFixed(2) + " %" :
"n/a"
@ -378,8 +384,6 @@ function processQuery (query, explain) {
references[node.subNodes[0].subNodes[0].name] = node.subNodes[0].subNodes[1];
}
return buildExpression(node.subNodes[1]);
case "verticalizer":
return buildExpression(node.subNodes[0]);
case "user function call":
return func(node.name) + "(" + ((node.subNodes && node.subNodes[0].subNodes) || [ ]).map(buildExpression).join(", ") + ")" + " " + annotation("/* user-defined function */");
case "function call":
@ -416,6 +420,10 @@ function processQuery (query, explain) {
return buildExpression(node.subNodes[0]) + " && " + buildExpression(node.subNodes[1]);
case "ternary":
return buildExpression(node.subNodes[0]) + " ? " + buildExpression(node.subNodes[1]) + " : " + buildExpression(node.subNodes[2]);
case "n-ary or":
return node.subNodes.map(function(sub) { return buildExpression(sub); }).join(" || ");
case "n-ary and":
return node.subNodes.map(function(sub) { return buildExpression(sub); }).join(" && ");
default:
return "unhandled node type (" + node.type + ")";
}
@ -486,11 +494,14 @@ function processQuery (query, explain) {
case "IndexNode":
collectionVariables[node.outVariable.id] = node.collection;
var types = [ ];
node.indexes.forEach(function (idx) {
node.indexes.forEach(function (idx, i) {
types.push((idx.reverse ? "reverse " : "") + idx.type + " index scan");
idx.collection = node.collection;
idx.node = node.id;
idx.ranges = [ ];
var condition = "";
if (node.condition.type === 'n-ary or') {
idx.condition = buildExpression(node.condition.subNodes[i]);
}
indexes.push(idx);
});
return keyword("FOR") + " " + variableName(node.outVariable) + " " + keyword("IN") + " " + collection(node.collection) + " " + annotation("/* " + types.join(", ") + " */");

27
js/common/modules/org/arangodb/aql/explainer.js
View File

@ -190,7 +190,7 @@ function printIndexes (indexes) {
stringBuilder.appendLine(" " + value("none"));
}
else {
var maxIdLen = String("Id").length;
var maxIdLen = String("By").length;
var maxCollectionLen = String("Collection").length;
var maxUniqueLen = String("Unique").length;
var maxSparseLen = String("Sparse").length;
@ -215,7 +215,7 @@ function printIndexes (indexes) {
maxCollectionLen = l;
}
});
var line = " " + pad(1 + maxIdLen - String("Id").length) + header("Id") + " " +
var line = " " + pad(1 + maxIdLen - String("By").length) + header("By") + " " +
header("Type") + pad(1 + maxTypeLen - "Type".length) + " " +
header("Collection") + pad(1 + maxCollectionLen - "Collection".length) + " " +
header("Unique") + pad(1 + maxUniqueLen - "Unique".length) + " " +
@ -231,7 +231,13 @@ function printIndexes (indexes) {
var sparsity = (indexes[i].hasOwnProperty("sparse") ? (indexes[i].sparse ? "true" : "false") : "n/a");
var fields = indexes[i].fields.map(attribute).join(", ");
var fieldsLen = indexes[i].fields.map(attributeUncolored).join(", ").length;
var ranges = "[ " + indexes[i].ranges + " ]";
var ranges;
if (indexes[i].hasOwnProperty("condition")) {
ranges = indexes[i].condition;
}
else {
ranges = "[ " + indexes[i].ranges + " ]";
}
var selectivity = (indexes[i].hasOwnProperty("selectivityEstimate") ?
(indexes[i].selectivityEstimate * 100).toFixed(2) + " %" :
"n/a"
@ -377,8 +383,6 @@ function processQuery (query, explain) {
references[node.subNodes[0].subNodes[0].name] = node.subNodes[0].subNodes[1];
}
return buildExpression(node.subNodes[1]);
case "verticalizer":
return buildExpression(node.subNodes[0]);
case "user function call":
return func(node.name) + "(" + ((node.subNodes && node.subNodes[0].subNodes) || [ ]).map(buildExpression).join(", ") + ")" + " " + annotation("/* user-defined function */");
case "function call":
@ -415,6 +419,10 @@ function processQuery (query, explain) {
return buildExpression(node.subNodes[0]) + " && " + buildExpression(node.subNodes[1]);
case "ternary":
return buildExpression(node.subNodes[0]) + " ? " + buildExpression(node.subNodes[1]) + " : " + buildExpression(node.subNodes[2]);
case "n-ary or":
return node.subNodes.map(function(sub) { return buildExpression(sub); }).join(" || ");
case "n-ary and":
return node.subNodes.map(function(sub) { return buildExpression(sub); }).join(" && ");
default:
return "unhandled node type (" + node.type + ")";
}
@ -485,11 +493,16 @@ function processQuery (query, explain) {
case "IndexNode":
collectionVariables[node.outVariable.id] = node.collection;
var types = [ ];
node.indexes.forEach(function (idx) {
node.indexes.forEach(function (idx, i) {
types.push((idx.reverse ? "reverse " : "") + idx.type + " index scan");
idx.collection = node.collection;
idx.node = node.id;
idx.ranges = [ ];
if (node.condition.type === 'n-ary or') {
idx.condition = buildExpression(node.condition.subNodes[i]);
}
else {
idx.conditionn = "";
}
indexes.push(idx);
});
return keyword("FOR") + " " + variableName(node.outVariable) + " " + keyword("IN") + " " + collection(node.collection) + " " + annotation("/* " + types.join(", ") + " */");