i got errors when i created the partition tables automatically via trigger which is created in advance.
enviorment info:
GP version :4.3.8.1
error:
NOTICE: Found 2 data formatting errors (2 or more input rows). Rejected related input data.
ERROR: function cannot execute on segment because it issues a non-SELECT statement (functions.c:135) (seg13 ZHJK-HADOOP-SLAVE6:40001 pid=19959) (cdbdisp.c:1326)
DETAIL:
SQL statement "CREATE TABLE T_FM_HISTORYALARM_20160101(CONSTRAINT T_FM_HISTORYALARM_20160101_eventtime_check CHECK (EVENTTIME >= timestamp '20160101000000' AND EVENTTIME < (timestamp '20160101000000' + interval '1 day')))INHERITS (T_FM_HISTORYALARM)"
PL/pgSQL function "history_alarm_partition" line 36 at execute statement
********** 错误 **********
ERROR: function cannot execute on segment because it issues a non-SELECT statement (functions.c:135) (seg13 ZHJK-HADOOP-SLAVE6:40001 pid=19959) (cdbdisp.c:1326)
SQL 状态: XX000
详细:
SQL statement "CREATE TABLE T_FM_HISTORYALARM_20160101(CONSTRAINT T_FM_HISTORYALARM_20160101_eventtime_check CHECK (EVENTTIME >= timestamp '20160101000000' AND EVENTTIME < (timestamp '20160101000000' + interval '1 day')))INHERITS (T_FM_HISTORYALARM)"
PL/pgSQL function "history_alarm_partition" line 36 at execute statement
function code:
CREATE OR REPLACE FUNCTION history_alarm_partition()
RETURNS trigger AS
$BODY$
DECLARE tbl_name CHARACTER VARYING;
tbl_name_parent CHARACTER VARYING := 'T_FM_HISTORYALARM';
tbl_name_salve CHARACTER VARYING;
tbl_year INTEGER;
tbl_month INTEGER;
tbl_day INTEGER;
create_tbl_sql CHARACTER VARYING;
insert_tbl_sql CHARACTER VARYING;
index_sql CHARACTER VARYING;
BEGIN
SELECT date_part('year',NEW.EVENTTIME) INTO tbl_year;
SELECT date_part('month',NEW.EVENTTIME) INTO tbl_month;
SELECT date_part('day',NEW.EVENTTIME) INTO tbl_day;
IF(tbl_month<10)THEN
tbl_name_salve=tbl_year||'0'||tbl_month;
ELSE
tbl_name_salve=tbl_year||tbl_month;
END IF;
IF(tbl_day<10)THEN
tbl_name_salve=tbl_name_salve||'0'||tbl_day;
ELSE
tbl_name_salve=tbl_name_salve||tbl_day;
END IF;
tbl_name=tbl_name_parent||'_'||tbl_name_salve;
--判断表 时间分段表是否存在
IF ( (SELECT count(relname) FROM pg_class WHERE relname=tbl_name)>0) THEN
insert_tbl_sql='INSERT INTO '||tbl_name ||' VALUES(NEW.*)';
EXECUTE insert_tbl_sql;
ELSE
create_tbl_sql='CREATE TABLE '||tbl_name
||'('
|| 'CONSTRAINT '||tbl_name||'_EVENTTIME_CHECK'||' CHECK (EVENTTIME >= timestamp '''||tbl_name_salve||'000000''' ||' AND EVENTTIME < (timestamp '''||tbl_name_salve||'000000'' + interval ''1 day''))'
||')INHERITS ('||tbl_name_parent||')';
EXECUTE create_tbl_sql;
index_sql='CREATE INDEX '||tbl_name||'_EVENTTIME_INDEX ON '||tbl_name||'EVENTTIME';
EXECUTE index_sql;
insert_tbl_sql='INSERT INTO '||tbl_name ||' VALUES(NEW.*)';
EXECUTE insert_tbl_sql;
END IF;
RETURN NULL;
END;
$BODY$
LANGUAGE plpgsql VOLATILE
create trigger code:
create trigger history_alarm_trigger before insert or update on t_fm_historyalarm for each row execute procedure history_alarm_partition();
it is ok when the funtion and trigger are executed , but when the values are inserted into the table T_FM_HISTORYALARM , the parent table ,the error occures.
if i execute the create table statmenet :
CREATE TABLE T_FM_HISTORYALARM_20160101(CONSTRAINT T_FM_HISTORYALARM_20160101_eventtime_check CHECK (EVENTTIME >= timestamp '20160101000000' AND EVENTTIME < (timestamp '20160101000000' + interval '1 day')))INHERITS (T_FM_HISTORYALARM)
it works well.
can you give me some advice? thank you very much.
This is the expected behavior; please see point 8) in the Greenplum Docs.
Triggers are not supported since they typically rely on the use of
VOLATILE
functions.