[Tile-serving] [openstreetmap/osm2pgsql] Introduce separate COPY threads (#914)

[Sarah Hoffmann]

lonvia commented on this pull request.



> +    void add_array_elem(char const *s)
+    {
+        assert(m_current);
+        m_current->buffer += '"';
+        add_escaped_string(s);
+        m_current->buffer += "\",";
+    }
+
+    /// Finish an array column.
+    void finish_array()
+    {
+        auto idx = m_current->buffer.size() - 1;
+        if (m_current->buffer[idx] == '{')
+            m_current->buffer += '}';
+        else
+            m_current->buffer[idx] = '}';

I've added documentation for all the functions in the copy manager. Hope that helps.

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