[Tile-serving] [openstreetmap/osm2pgsql] Fix multistage processing (take 2) (#1215)

[Jochen Topf]

@joto commented on this pull request.



> +        return;
+    }
+
+    if (ltype != LUA_TTABLE) {
+        throw std::runtime_error{
+            "Table returned from mark_relation_members() contains 'ways' "
+            "field, but it isn't an array table"};
+    }
+
+    // Iterate over the 'ways' table to get all ids...
+    lua_pushnil(lua_state());
+    while (lua_next(lua_state(), -2) != 0) {
+        if (!lua_isnumber(lua_state(), -2)) {
+            throw std::runtime_error{
+                "Table returned from mark_relation_members() contains 'ways' "
+                "field, but it isn't an array table"};

The check is for the table key not the value. The table key is a number in "array tables", so we are checking the table is an array, not a hash.

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