that should receive paths representing computation of this step,
and <literal>input_rel</literal> is the relation representing the input to this
step. The <literal>extra</literal> parameter provides additional details,
- currently, it is set only for <literal>UPPERREL_PARTIAL_GROUP_AGG</>
+ currently, it is set only for <literal>UPPERREL_PARTIAL_GROUP_AGG</literal>
or <literal>UPPERREL_GROUP_AGG</literal>, in which case it points to a
- <literal>GroupPathExtraData</> structure.
+ <literal>GroupPathExtraData</literal> structure.
(Note that <structname>ForeignPath</structname> paths added
to <literal>output_rel</literal> would typically not have any direct dependency
on paths of the <literal>input_rel</literal>, since their processing is expected