<p><b>@mmd-osm</b> commented on this pull request.</p>

<hr>

<p>In <a href="https://github.com/openstreetmap/osm2pgsql/pull/956#discussion_r330184380">table.cpp</a>:</p>
<pre style='color:#555'>>              m_copy.add_column(from);
         } else if (items == 2) {
-            m_copy.add_column((from + to) / 2);
+            // calculate mean while avoiding overflows
+            int64_t mean = (from / 2) + (to / 2) + ((from % 2 + to % 2) / 2);
</pre>
<p>How about  <code>from + ( (to - from) / 2)</code>, assuming <em>to</em>  and <em>from</em> are positive and <em>from <= to</em>?</p>

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