Dear experts, I tried to create an function in monetdb, but the first one successful, the second one successful, but the combo failed. create function neighbor19() returns table (ra_avg double) begin declare table uzone (id bigint, ra_avg double); insert into uzone select id, ra_avg from uniquecatalog11; return table( select ra_avg from uzone as u0 where id between 10 and 20 ); end; successful. create function neighbor20() returns table (ra_avg double) begin declare table uzone (id bigint, ra_avg double); insert into uzone select id, ra_avg from uniquecatalog11; return table( select ra_avg from uzone as u0 where ra_avg between 10 and 20 ); end; successful. create function neighbor30() returns table (ra_avg double) begin declare table uzone (id bigint, ra_avg double); insert into uzone select id, ra_avg from uniquecatalog11; return table( select ra_avg from uzone as u0 where id between 10 and 20 and ra_avg between 10 and 20 ); end; failed with monetdb exited. in merovingian.log: 2015-07-19 13:34:36 MSG merovingian[25753]: database 'gwacdb' (633) was killed by signal SIGSEGV I tried on default and Jul2015 branch, all the same with each other. Any help or hints are appreciated! Best, Meng