result relation ... wrong ...

a SubLink with the subplan's targetlist.  This fixes a problem seen with,
for example, a subselect that uses GROUP BY.

thereby guaranteeing wrong results from a rescanned Group node.

that contain null fields.  Old code would produce erratic sort results
because comparisons of tuples containing nulls could produce inconsistent
answers.

----------
exec sql begin declare section;
   short s ;
   unsigned short us;
exec sql end   declare section;
exec sql create table test(s smallint, us smallint);
exec sql commit;
s = 1; us =32000;
exec sql insert into test values( :s, :us ) ;  <== error

Error Message: "i4toi2: '-600309759' causes int2 underflow"

Masaaki Sakaida