sql - MySQL string data truncated in group_concat and order by -


i have sql works fine truncates serialized data on string fields long more 1024bytes. tried change mysql variable group_concat_max_len, nothing has changed. there other session variables involved in?

set session group_concat_max_len = 100000; select concat(area,';',               colore,';',               cast(percentuale char(20)),';',               cast(trasparenza char(20)),';',               date_format(data_misura,'%y%m%d'),';',                ( select group_concat( concat( cast(x char(20)), ' ', cast(y                        char(20)) ) order progressivo_vertice separator ';')                   plan_poligoni                  id_imm = pp_gen.id_imm                    , scheda = pp_gen.scheda                    , progressivo = pp_gen.progressivo                    , if(data null,'',data) = if(pp_gen.data null,'',pp_gen.data)),'|')  serialized_polygons plan_poligoni pp_gen scheda=1    , id_imm = 1111    , progressivo_vertice = 1 group id_imm, scheda, progressivo;


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