[Tile-serving] [openstreetmap/osm2pgsql] Fix deletion on update in gazetteer (#1008)

[Sarah Hoffmann]

lonvia commented on this pull request.



>  {
-    assert(!m_inflight);
-
-    std::string sql = "DELETE FROM ";
-    sql.reserve(buffer->target->name.size() + buffer->deletables.size() * 15 +
-                30);
-    sql += buffer->target->name;
-    sql += " WHERE ";
-    sql += buffer->target->id;
-    sql += " IN (";
-    for (auto id : buffer->deletables) {
-        sql += std::to_string(id);
+    std::string sql = "DELETE FROM {} WHERE {} IN ("_format(table, column);
+    sql.reserve(m_deletables.size() * 15 + sql.size());

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