tursom/memgraph
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

Interpreter merge.

Browse Source
This commit is contained in:
Marko Budiselic 2017-03-11 21:21:09 +01:00
parent 0eeb1fc5b4
commit 10062b143c
1 changed files with 29 additions and 19 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

48
src/query/entry.hpp
View File

@ -1,45 +1,55 @@
#pragma once
#include "database/graph_db_accessor.hpp"
#include "query/frontend/opencypher/parser.hpp"
#include "query/context.hpp"
#include "query/frontend/opencypher/parser.hpp"
#include "query/frontend/typecheck/typecheck.hpp"
namespace query {
template <typename Stream>
class Engine {
public:
Engine() {
}
Engine() {}
auto Execute(const std::string &query, GraphDbAccessor &db_accessor,
Stream &stream) {
Config config;
Context ctx(config, db_accessor);
// query -> AST
::frontend::opencypher::Parser parser(query);
auto low_level_tree = parser.tree();
auto high_level_tree = low2high_tree.Apply(ctx, low_level_tree);
TypedcheckedTree typechecked_tree;
auto logical_plan = LogicalPlanner(ctx).Apply(typechecked_tree);
// interpret & stream results
// AST -> high level tree
auto high_level_tree = low2high_tree.Apply(ctx, low_level_tree);
// symbol table fill
SymbolTable symbol_table;
TypeCheckVisitor typecheck_visitor;
high_level_tree.Accept(typecheck_visitor);
// high level tree -> logical plan
auto logical_plan = query::Apply(high_level_tree);
// generate frame based on symbol table max_position
Frame frame(size);
Frame frame(symbol_table.max_position());
// interpret
auto cursor = logical_plan.MakeCursor(frame);
logical_plan.WriteHeader(stream);
auto symbols = logical_plan.OutputSymbols(symbol_table);
while (cursor.pull(frame, context)) {
std::vector<TypedValue> values(symbols.size());
for (auto symbol : symbols) {
values.emplace_back(frame[symbol]);
}
stream.Result(values);
std::vector<TypedValue> values(symbols.size());
for (auto symbol : symbols) {
values.emplace_back(frame[symbol]);
}
stream.Result(values);
}
stream.Summary({"type": "r"});
stream.Summary({"type" : "r"});
}
private:
Context ctx;
HighLevelAstConversion low2high_tree;
private:
Context ctx;
HighLevelAstConversion low2high_tree;
};
}