Fix warnings in planner

Reviewers: teon.banek

Reviewed By: teon.banek

Differential Revision: https://phabricator.memgraph.io/D678

src/query/plan/planner.hpp

@@ -22,7 +22,7 @@ struct Expansion {
   /// @c EdgeAtom during plan generation.
   EdgeAtom::Direction direction = EdgeAtom::Direction::BOTH;
   /// Set of symbols found inside the range expressions of a variable path edge.
-  std::unordered_set<Symbol> symbols_in_range;
+  std::unordered_set<Symbol> symbols_in_range{};
   /// Optional node at the other end of an edge. If the expansion
   /// contains an edge, then this node is required.
   NodeAtom *node2 = nullptr;
@@ -40,8 +40,8 @@ class Filters {
     /// Expression which when evaluated produces the value a property must
     /// equal.
     Expression *expression = nullptr;
-    std::experimental::optional<Bound> lower_bound;
+    std::experimental::optional<Bound> lower_bound{};
-    std::experimental::optional<Bound> upper_bound;
+    std::experimental::optional<Bound> upper_bound{};
   };
 
   /// All filter expressions that should be generated.
@@ -122,7 +122,7 @@ struct QueryPart {
   /// @brief All `MATCH` clauses merged into one @c Matching.
   Matching matching;
   /// @brief Each `OPTIONAL MATCH` converted to @c Matching.
-  std::vector<Matching> optional_matching;
+  std::vector<Matching> optional_matching{};
   /// @brief @c Matching for each `MERGE` clause.
   ///
   /// Storing the normalized pattern of a @c Merge does not preclude storing the
@@ -132,9 +132,9 @@ struct QueryPart {
   ///
   /// Since @c Merge is contained in `remaining_clauses`, this vector contains
   /// matching in the same order as @c Merge appears.
-  std::vector<Matching> merge_matching;
+  std::vector<Matching> merge_matching{};
   /// @brief All the remaining clauses (without @c Match).
-  std::vector<Clause *> remaining_clauses;
+  std::vector<Clause *> remaining_clauses{};
 };
 
 /// @brief Context which contains variables commonly used during planning.
@@ -158,7 +158,7 @@ struct PlanningContext {
   /// read a symbol or write it. E.g. `MATCH (n) -[r]- (n)` would bind (and
   /// write) the first `n`, but the latter `n` would only read the already
   /// written information.
-  std::unordered_set<Symbol> bound_symbols;
+  std::unordered_set<Symbol> bound_symbols{};
 };
 
 /// @brief Planner which uses hardcoded rules to produce operators.

src/query/plan/rule_based_planner.cpp

@@ -184,7 +184,7 @@ struct MatchContext {
   // Determines whether the match should see the new graph state or not.
   GraphView graph_view = GraphView::OLD;
   // All the newly established symbols in match.
-  std::vector<Symbol> new_symbols;
+  std::vector<Symbol> new_symbols{};
 };
 
 auto GenFilters(LogicalOperator *last_op,
@@ -639,7 +639,7 @@ LogicalOperator *HandleWriteClause(Clause *clause, LogicalOperator *input_op,
 std::vector<Expansion> NormalizePatterns(
     const SymbolTable &symbol_table, const std::vector<Pattern *> &patterns) {
   std::vector<Expansion> expansions;
-  auto ignore_node = [&](auto *node) {};
+  auto ignore_node = [&](auto *) {};
   auto collect_expansion = [&](auto *prev_node, auto *edge,
                                auto *current_node) {
     UsedSymbolsCollector collector(symbol_table);
@@ -739,13 +739,14 @@ bool FindBestLabelPropertyIndex(
     return true;
   };
   bool found = false;
-  size_t min_count = std::numeric_limits<size_t>::max();
+  auto min_count = std::numeric_limits<decltype(db.VerticesCount(
+      GraphDbTypes::Label{}, GraphDbTypes::Property{}))>::max();
   for (const auto &label : labels) {
     for (const auto &prop_pair : property_filters) {
       const auto &property = prop_pair.first;
       if (db.LabelPropertyIndexExists(label, property)) {
-        auto VerticesCount = db.VerticesCount(label, property);
+        auto vertices_count = db.VerticesCount(label, property);
-        if (VerticesCount < min_count) {
+        if (vertices_count < min_count) {
           for (const auto &prop_filter : prop_pair.second) {
             if (prop_filter.used_symbols.find(symbol) !=
                 prop_filter.used_symbols.end()) {
@@ -759,7 +760,7 @@ bool FindBestLabelPropertyIndex(
               // Take the first property filter which uses bound symbols.
               best_label = label;
               best_property = {property, prop_filter};
-              min_count = VerticesCount;
+              min_count = vertices_count;
               found = true;
               break;
             }
@@ -1081,8 +1082,7 @@ void Filters::CollectPatternFilters(Pattern &pattern, SymbolTable &symbol_table,
     }
     add_properties_filter(node);
   };
-  auto add_expand_filter = [&](NodeAtom *prev_node, EdgeAtom *edge,
+  auto add_expand_filter = [&](NodeAtom *, EdgeAtom *edge, NodeAtom *node) {
-                               NodeAtom *node) {
     const auto &edge_symbol = symbol_table.at(*edge->identifier_);
     if (!edge->edge_types_.empty()) {
       if (edge->has_range_) {