diff --git a/include/chinese/chinesePostman.hpp b/include/chinese/chinesePostman.hpp
index fe4d529a1e..501769a111 100644
--- a/include/chinese/chinesePostman.hpp
+++ b/include/chinese/chinesePostman.hpp
@@ -139,7 +139,6 @@ PgrDirectedChPPGraph::PgrDirectedChPPGraph(const std::vector<Edge_t> &dataEdges)
 
     // calcu deg & build part of edges
     std::map<int64_t, int> deg;
-    size_t i(0);
     for (const auto &e : originalEdges) {
         pgassert(e.cost > 0);
         /* has out going edge */
@@ -165,7 +164,6 @@ PgrDirectedChPPGraph::PgrDirectedChPPGraph(const std::vector<Edge_t> &dataEdges)
         edge.capacity = (std::numeric_limits<int32_t>::max)();
         edge.cost = e.cost;
         edges.push_back(edge);
-        ++i;
     }
 
     superSource = deg.rbegin()->first + 1;
diff --git a/src/astar/astar.c b/src/astar/astar.c
index 444a29b754..1bf9284269 100644
--- a/src/astar/astar.c
+++ b/src/astar/astar.c
@@ -184,7 +184,7 @@ _pgr_astar(PG_FUNCTION_ARGS) {
         int64_t seq = call_cntr == 0?  1 : result_tuples[call_cntr - 1].start_id;
 
         values[0] = Int32GetDatum((int32_t)call_cntr + 1);
-        values[1] = Int32GetDatum(seq);
+        values[1] = Int32GetDatum((int32_t)seq);
         values[2] = Int64GetDatum(result_tuples[call_cntr].start_id);
         values[3] = Int64GetDatum(result_tuples[call_cntr].end_id);
         values[4] = Int64GetDatum(result_tuples[call_cntr].node);
diff --git a/src/bdAstar/bdAstar.c b/src/bdAstar/bdAstar.c
index 06f2404c0a..64359b91dd 100644
--- a/src/bdAstar/bdAstar.c
+++ b/src/bdAstar/bdAstar.c
@@ -179,8 +179,8 @@ _pgr_bdastar(PG_FUNCTION_ARGS) {
 
         int64_t seq = call_cntr == 0?  1 : result_tuples[call_cntr - 1].start_id;
 
-        values[0] = Int32GetDatum(call_cntr + 1);
-        values[1] = Int32GetDatum(seq);
+        values[0] = Int32GetDatum((int32_t)call_cntr + 1);
+        values[1] = Int32GetDatum((int32_t)seq);
         values[2] = Int64GetDatum(result_tuples[call_cntr].start_id);
         values[3] = Int64GetDatum(result_tuples[call_cntr].end_id);
         values[4] = Int64GetDatum(result_tuples[call_cntr].node);
diff --git a/src/bdDijkstra/bdDijkstra.c b/src/bdDijkstra/bdDijkstra.c
index ec75c82317..843efdf289 100644
--- a/src/bdDijkstra/bdDijkstra.c
+++ b/src/bdDijkstra/bdDijkstra.c
@@ -161,8 +161,8 @@ PGDLLEXPORT Datum _pgr_bddijkstra(PG_FUNCTION_ARGS) {
 
         int64_t seq = call_cntr == 0?  1 : result_tuples[call_cntr - 1].start_id;
 
-        values[0] = Int32GetDatum(call_cntr + 1);
-        values[1] = Int32GetDatum(seq);
+        values[0] = Int32GetDatum((int32_t)call_cntr + 1);
+        values[1] = Int32GetDatum((int32_t)seq);
         values[2] = Int64GetDatum(result_tuples[call_cntr].start_id);
         values[3] = Int64GetDatum(result_tuples[call_cntr].end_id);
         values[4] = Int64GetDatum(result_tuples[call_cntr].node);
diff --git a/src/bellman_ford/bellman_ford.c b/src/bellman_ford/bellman_ford.c
index a26e0e6303..60962c06de 100644
--- a/src/bellman_ford/bellman_ford.c
+++ b/src/bellman_ford/bellman_ford.c
@@ -165,8 +165,8 @@ _pgr_bellmanford(PG_FUNCTION_ARGS) {
 
         int64_t seq = funcctx->call_cntr == 0?  1 : result_tuples[funcctx->call_cntr - 1].start_id;
 
-        values[0] = Int32GetDatum(funcctx->call_cntr + 1);
-        values[1] = Int32GetDatum(seq);
+        values[0] = Int32GetDatum((int32_t)funcctx->call_cntr + 1);
+        values[1] = Int32GetDatum((int32_t)seq);
         values[2] = Int64GetDatum(result_tuples[funcctx->call_cntr].start_id);
         values[3] = Int64GetDatum(result_tuples[funcctx->call_cntr].end_id);
         values[4] = Int64GetDatum(result_tuples[funcctx->call_cntr].node);
diff --git a/src/bellman_ford/bellman_ford_neg.c b/src/bellman_ford/bellman_ford_neg.c
index c922f781a5..d5c9f1fe4b 100644
--- a/src/bellman_ford/bellman_ford_neg.c
+++ b/src/bellman_ford/bellman_ford_neg.c
@@ -169,7 +169,7 @@ _pgr_bellmanfordneg(PG_FUNCTION_ARGS) {
         int64_t seq = funcctx->call_cntr == 0?  1 : result_tuples[funcctx->call_cntr - 1].start_id;
 
         values[0] = Int32GetDatum(funcctx->call_cntr + 1);
-        values[1] = Int32GetDatum(seq);
+        values[1] = Int32GetDatum((int32_t)seq);
         values[2] = Int64GetDatum(result_tuples[funcctx->call_cntr].start_id);
         values[3] = Int64GetDatum(result_tuples[funcctx->call_cntr].end_id);
         values[4] = Int64GetDatum(result_tuples[funcctx->call_cntr].node);
diff --git a/src/bellman_ford/edwardMoore.c b/src/bellman_ford/edwardMoore.c
index 7e14b5dd3a..929dacf36d 100644
--- a/src/bellman_ford/edwardMoore.c
+++ b/src/bellman_ford/edwardMoore.c
@@ -158,8 +158,8 @@ PGDLLEXPORT Datum _pgr_edwardmoore(PG_FUNCTION_ARGS) {
 
         int64_t seq = funcctx->call_cntr == 0?  1 : result_tuples[funcctx->call_cntr - 1].start_id;
 
-        values[0] = Int32GetDatum(funcctx->call_cntr + 1);
-        values[1] = Int32GetDatum(seq);
+        values[0] = Int32GetDatum((int32_t) funcctx->call_cntr + 1);
+        values[1] = Int32GetDatum((int32_t)seq);
         values[2] = Int64GetDatum(result_tuples[funcctx->call_cntr].start_id);
         values[3] = Int64GetDatum(result_tuples[funcctx->call_cntr].end_id);
         values[4] = Int64GetDatum(result_tuples[funcctx->call_cntr].node);
diff --git a/src/breadthFirstSearch/binaryBreadthFirstSearch.c b/src/breadthFirstSearch/binaryBreadthFirstSearch.c
index 423628c0c2..e8a5734a29 100644
--- a/src/breadthFirstSearch/binaryBreadthFirstSearch.c
+++ b/src/breadthFirstSearch/binaryBreadthFirstSearch.c
@@ -158,8 +158,8 @@ PGDLLEXPORT Datum _pgr_binarybreadthfirstsearch(PG_FUNCTION_ARGS) {
 
         int64_t seq = funcctx->call_cntr == 0?  1 : result_tuples[funcctx->call_cntr - 1].start_id;
 
-        values[0] = Int32GetDatum(funcctx->call_cntr + 1);
-        values[1] = Int32GetDatum(seq);
+        values[0] = Int32GetDatum((int32_t)funcctx->call_cntr + 1);
+        values[1] = Int32GetDatum((int32_t)seq);
         values[2] = Int64GetDatum(result_tuples[funcctx->call_cntr].start_id);
         values[3] = Int64GetDatum(result_tuples[funcctx->call_cntr].end_id);
         values[4] = Int64GetDatum(result_tuples[funcctx->call_cntr].node);
diff --git a/src/common/basePath_SSEC.cpp b/src/common/basePath_SSEC.cpp
index d80d0caf42..c2f62c6825 100644
--- a/src/common/basePath_SSEC.cpp
+++ b/src/common/basePath_SSEC.cpp
@@ -234,7 +234,6 @@ void Path::append(const Path &other) {
 void Path::generate_postgres_data(
         Path_rt **postgres_data,
         size_t &sequence) const {
-    int i = 1;
     for (const auto e : path) {
         auto agg_cost = std::fabs(
                 e.agg_cost - (std::numeric_limits<double>::max)()) < 1?
@@ -243,7 +242,6 @@ void Path::generate_postgres_data(
             std::numeric_limits<double>::infinity() : e.cost;
 
         (*postgres_data)[sequence] = {start_id(), end_id(), e.node, e.edge, cost, agg_cost};
-        ++i;
         ++sequence;
     }
 }
diff --git a/src/dagShortestPath/dagShortestPath.c b/src/dagShortestPath/dagShortestPath.c
index 8e50d3fe1e..74295b2a90 100644
--- a/src/dagShortestPath/dagShortestPath.c
+++ b/src/dagShortestPath/dagShortestPath.c
@@ -165,8 +165,8 @@ PGDLLEXPORT Datum _pgr_dagshortestpath(PG_FUNCTION_ARGS) {
 
         int64_t seq = funcctx->call_cntr == 0?  1 : result_tuples[funcctx->call_cntr - 1].start_id;
 
-        values[0] = Int32GetDatum(funcctx->call_cntr + 1);
-        values[1] = Int32GetDatum(seq);
+        values[0] = Int32GetDatum((int32_t)funcctx->call_cntr + 1);
+        values[1] = Int32GetDatum((int32_t)seq);
         values[2] = Int64GetDatum(result_tuples[funcctx->call_cntr].node);
         values[3] = Int64GetDatum(result_tuples[funcctx->call_cntr].edge);
         values[4] = Float8GetDatum(result_tuples[funcctx->call_cntr].cost);
diff --git a/src/dijkstra/dijkstra.c b/src/dijkstra/dijkstra.c
index 2dc6c82993..0e47f3a641 100644
--- a/src/dijkstra/dijkstra.c
+++ b/src/dijkstra/dijkstra.c
@@ -218,8 +218,8 @@ _pgr_dijkstra(PG_FUNCTION_ARGS) {
 
         int64_t seq = call_cntr == 0?  1 : result_tuples[call_cntr - 1].start_id;
 
-        values[0] = Int32GetDatum(call_cntr + 1);
-        values[1] = Int32GetDatum(seq);
+        values[0] = Int32GetDatum((int32_t)call_cntr + 1);
+        values[1] = Int32GetDatum((int32_t)seq);
         values[2] = Int64GetDatum(result_tuples[call_cntr].start_id);
         values[3] = Int64GetDatum(result_tuples[call_cntr].end_id);
         values[4] = Int64GetDatum(result_tuples[call_cntr].node);
diff --git a/src/driving_distance/driving_distance.c b/src/driving_distance/driving_distance.c
index c60255f819..d687beb3da 100644
--- a/src/driving_distance/driving_distance.c
+++ b/src/driving_distance/driving_distance.c
@@ -142,7 +142,7 @@ _pgr_drivingdistancev4(PG_FUNCTION_ARGS) {
         for (i = 0; i < numb; ++i) {
             nulls[i] = false;
         }
-        values[0] = Int32GetDatum(funcctx->call_cntr + 1);
+        values[0] = Int32GetDatum((int32_t)funcctx->call_cntr + 1);
         values[1] = Int64GetDatum(result_tuples[funcctx->call_cntr].depth);
         values[2] = Int64GetDatum(result_tuples[funcctx->call_cntr].from_v);
         values[3] = Int64GetDatum(result_tuples[funcctx->call_cntr].pred);
diff --git a/src/driving_distance/driving_distance_withPoints.c b/src/driving_distance/driving_distance_withPoints.c
index 130e633f97..236f23546c 100644
--- a/src/driving_distance/driving_distance_withPoints.c
+++ b/src/driving_distance/driving_distance_withPoints.c
@@ -176,7 +176,7 @@ _pgr_withpointsddv4(PG_FUNCTION_ARGS) {
             nulls[i] = false;
         }
 
-        values[0] = Int64GetDatum(funcctx->call_cntr + 1);
+        values[0] = Int64GetDatum((int64_t)funcctx->call_cntr + 1);
         values[1] = Int64GetDatum(result_tuples[funcctx->call_cntr].depth);
         values[2] = Int64GetDatum(result_tuples[funcctx->call_cntr].from_v);
         values[3] = Int64GetDatum(result_tuples[funcctx->call_cntr].pred);
diff --git a/src/ksp/ksp.c b/src/ksp/ksp.c
index 100b6708a2..5476f588bd 100644
--- a/src/ksp/ksp.c
+++ b/src/ksp/ksp.c
@@ -197,9 +197,9 @@ _pgr_ksp(PG_FUNCTION_ARGS) {
         }
         int64_t seq = funcctx->call_cntr == 0?  1 : path[funcctx->call_cntr - 1].end_id;
 
-        values[0] = Int32GetDatum(funcctx->call_cntr + 1);
-        values[1] = Int32GetDatum(path_id);
-        values[2] = Int32GetDatum(seq);
+        values[0] = Int32GetDatum((int32_t)funcctx->call_cntr + 1);
+        values[1] = Int32GetDatum((int32_t)path_id);
+        values[2] = Int32GetDatum((int32_t)seq);
         if (PG_NARGS() != 6) {
             values[3] = Int64GetDatum(path[funcctx->call_cntr].start_id);
             values[4] = Int64GetDatum(path[funcctx->call_cntr].end_id);
diff --git a/src/ksp/turnRestrictedPath.c b/src/ksp/turnRestrictedPath.c
index 34eb7eb90e..e0de7adbf8 100644
--- a/src/ksp/turnRestrictedPath.c
+++ b/src/ksp/turnRestrictedPath.c
@@ -175,9 +175,9 @@ _pgr_turnrestrictedpath(PG_FUNCTION_ARGS) {
 
         int64_t seq = funcctx->call_cntr == 0?  1 : path[funcctx->call_cntr - 1].start_id;
 
-        values[0] = Int32GetDatum(funcctx->call_cntr + 1);
-        values[1] = Int32GetDatum(path[funcctx->call_cntr].start_id + 1);
-        values[2] = Int32GetDatum(seq);
+        values[0] = Int32GetDatum((int32_t)funcctx->call_cntr + 1);
+        values[1] = Int32GetDatum((int32_t)path[funcctx->call_cntr].start_id + 1);
+        values[2] = Int32GetDatum((int32_t)seq);
         values[3] = Int64GetDatum(path[funcctx->call_cntr].node);
         values[4] = Int64GetDatum(path[funcctx->call_cntr].edge);
         values[5] = Float8GetDatum(path[funcctx->call_cntr].cost);
diff --git a/src/ksp/withPoints_ksp.c b/src/ksp/withPoints_ksp.c
index 0632ef6854..316bf102b5 100644
--- a/src/ksp/withPoints_ksp.c
+++ b/src/ksp/withPoints_ksp.c
@@ -249,9 +249,9 @@ PGDLLEXPORT Datum _pgr_withpointsksp(PG_FUNCTION_ARGS) {
         }
         int64_t seq = funcctx->call_cntr == 0?  1 : result_tuples[funcctx->call_cntr - 1].end_id;
 
-        values[0] = Int32GetDatum(funcctx->call_cntr + 1);
-        values[1] = Int32GetDatum(path_id);
-        values[2] = Int32GetDatum(seq);
+        values[0] = Int32GetDatum((int32_t)funcctx->call_cntr + 1);
+        values[1] = Int32GetDatum((int32_t)path_id);
+        values[2] = Int32GetDatum((int32_t)seq);
         if (PG_NARGS() != 9) {
             values[3] = Int64GetDatum(result_tuples[funcctx->call_cntr].start_id);
             values[4] = Int64GetDatum(result_tuples[funcctx->call_cntr].end_id);
diff --git a/src/trsp/trsp.c b/src/trsp/trsp.c
index fe7a6cd3bc..8a221bd575 100644
--- a/src/trsp/trsp.c
+++ b/src/trsp/trsp.c
@@ -161,7 +161,7 @@ _pgr_trspv4(PG_FUNCTION_ARGS) {
         int64_t path_seq = call_cntr == 0?  1 : result_tuples[call_cntr - 1].start_id;
 
         values[0] = Int32GetDatum((int32_t)call_cntr + 1);
-        values[1] = Int32GetDatum(path_seq);
+        values[1] = Int32GetDatum((int32_t)path_seq);
         values[2] = Int64GetDatum(result_tuples[call_cntr].start_id);
         values[3] = Int64GetDatum(result_tuples[call_cntr].end_id);
         values[4] = Int64GetDatum(result_tuples[call_cntr].node);
@@ -257,7 +257,7 @@ _v4trsp(PG_FUNCTION_ARGS) {
         int64_t path_seq = call_cntr == 0?  1 : result_tuples[call_cntr - 1].start_id;
 
         values[0] = Int32GetDatum((int32_t)call_cntr + 1);
-        values[1] = Int32GetDatum(path_seq);
+        values[1] = Int32GetDatum((int32_t)path_seq);
         values[2] = Int64GetDatum(result_tuples[call_cntr].start_id);
         values[3] = Int64GetDatum(result_tuples[call_cntr].end_id);
         values[4] = Int64GetDatum(result_tuples[call_cntr].node);
@@ -341,8 +341,8 @@ _trsp(PG_FUNCTION_ARGS) {
 
         int64_t path_seq = call_cntr == 0?  1 : result_tuples[call_cntr - 1].start_id;
 
-        values[0] = Int32GetDatum(call_cntr + 1);
-        values[1] = Int32GetDatum(path_seq);
+        values[0] = Int32GetDatum((int32_t)call_cntr + 1);
+        values[1] = Int32GetDatum((int32_t)path_seq);
         values[2] = Int64GetDatum(result_tuples[call_cntr].start_id);
         values[3] = Int64GetDatum(result_tuples[call_cntr].end_id);
         values[4] = Int64GetDatum(result_tuples[call_cntr].node);
diff --git a/src/trsp/trsp_withPoints.c b/src/trsp/trsp_withPoints.c
index 5f0f04cee5..87052fd311 100644
--- a/src/trsp/trsp_withPoints.c
+++ b/src/trsp/trsp_withPoints.c
@@ -206,8 +206,8 @@ _pgr_trsp_withpoints(PG_FUNCTION_ARGS) {
         }
 
         int64_t seq = call_cntr == 0? 1 : result_tuples[call_cntr - 1].start_id;
-        values[0] = Int32GetDatum(call_cntr + 1);
-        values[1] = Int32GetDatum(seq);
+        values[0] = Int32GetDatum((int32_t)call_cntr + 1);
+        values[1] = Int32GetDatum((int32_t)seq);
         values[2] = Int64GetDatum(result_tuples[call_cntr].start_id);
         values[3] = Int64GetDatum(result_tuples[call_cntr].end_id);
         values[4] = Int64GetDatum(result_tuples[call_cntr].node);
diff --git a/src/tsp/tsp.cpp b/src/tsp/tsp.cpp
index cfb0a1887a..8023905861 100644
--- a/src/tsp/tsp.cpp
+++ b/src/tsp/tsp.cpp
@@ -230,7 +230,7 @@ TSP::tsp(
     auto u = get_boost_vertex(start_vid);
     auto v = get_boost_vertex(end_vid);
 
-    auto dummy_node = add_vertex(num_vertices(graph), graph);
+    auto dummy_node = add_vertex(static_cast<int>(num_vertices(graph)), graph);
     id_to_V.insert(std::make_pair(0, dummy_node));
     V_to_id.insert(std::make_pair(dummy_node, 0));
     boost::add_edge(u, dummy_node, 0, graph);
@@ -299,8 +299,8 @@ TSP::TSP(std::vector<IID_t_rt> &distances) {
         }
     }
 
-    size_t i {0};
-    for (const auto id : ids) {
+    int i {0};
+    for (const auto &id : ids) {
         auto v = add_vertex(i, graph);
         id_to_V.insert(std::make_pair(id, v));
         V_to_id.insert(std::make_pair(v, id));
@@ -384,7 +384,7 @@ TSP::TSP(const std::vector<Coordinate_t> &coordinates) {
     /*
      * Inserting vertices
      */
-    size_t i{0};
+    int i{0};
     for (const auto &id : ids) {
         auto v = add_vertex(i, graph);
         id_to_V.insert(std::make_pair(id, v));
diff --git a/src/withPoints/withPoints.c b/src/withPoints/withPoints.c
index 4325e8ce30..6a2036bab8 100644
--- a/src/withPoints/withPoints.c
+++ b/src/withPoints/withPoints.c
@@ -200,8 +200,8 @@ _pgr_withpoints(PG_FUNCTION_ARGS) {
 
         int64_t seq = funcctx->call_cntr == 0?  1 : result_tuples[funcctx->call_cntr - 1].start_id;
 
-        values[0] = Int32GetDatum(funcctx->call_cntr + 1);
-        values[1] = Int32GetDatum(seq);
+        values[0] = Int32GetDatum((int32_t)funcctx->call_cntr + 1);
+        values[1] = Int32GetDatum((int32_t)seq);
         values[2] = Int64GetDatum(result_tuples[funcctx->call_cntr].start_id);
         values[3] = Int64GetDatum(result_tuples[funcctx->call_cntr].end_id);
         values[4] = Int64GetDatum(result_tuples[funcctx->call_cntr].node);
diff --git a/src/withPoints/withPoints.cpp b/src/withPoints/withPoints.cpp
index df4c9f6a83..9123fed8de 100644
--- a/src/withPoints/withPoints.cpp
+++ b/src/withPoints/withPoints.cpp
@@ -341,7 +341,6 @@ Pg_points_graph::create_new_edges() {
             << point.vertex_id << "\n";
     }
 
-    int64_t vertex_id = 1;
     std::vector< Point_on_edge_t > new_points;
     for (const auto edge : m_edges_of_points) {
         std::set< Point_on_edge_t, pointCompare> points_on_edge;
@@ -400,7 +399,6 @@ Pg_points_graph::create_new_edges() {
             if (point.fraction > 0 &&  point.fraction < 1) {
                 log << "vertex_id of the point is " << -point.pid << "\n";
                 point.vertex_id = -point.pid;
-                ++vertex_id;
             }
             new_points.push_back(point);