Partition with check constraint with "like"

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От Nagaraj Raj
Тема Partition with check constraint with "like"
Дата
Msg-id 87840670.92362.1621557131080@mail.yahoo.com
обсуждение исходный текст
Ответы Re: Partition with check constraint with "like"  (David Rowley <dgrowleyml@gmail.com>)
Список pgsql-performance
Hi,

I am trying to create partitions on the table based on first letter of the column record  value using inherit relation & check constraint.

Somehow able to create and load the data into the tables as per my requirement.

But the problem is when querying the data on that partitioned column, it's referring to all the children's tables instead of the matching table.


create table t1(id int,name text);

 
CREATE TABLE partition_tab.t1_name_null
(
 CONSTRAINT null_check CHECK (name IS NULL)
) INHERITS (t1);
 
CREATE or replace FUNCTION partition_tab.func_t1_insert_trigger()
 RETURNS trigger
 LANGUAGE 'plpgsql'
 COST 100
 VOLATILE NOT LEAKPROOF
AS $BODY$
DECLARE
 chk_cond text;
 c_table TEXT;
 c_table1 text;
 new_name  text;
 m_table1 text;
 BEGIN
 
 if ( NEW.name is null) THEN
 INSERT into partition_tab.t1_name_null VALUES (NEW.*);
 elseif ( NEW.name is not null) THEN
 new_name:= substr(NEW.name,1,1);
 raise info 'new_name %',new_name;
 
 c_table := TG_TABLE_NAME || '_' || new_name;
 c_table1 := 'partition_tab.' || c_table;
 m_table1 := ''||TG_TABLE_NAME;
 IF NOT EXISTS(SELECT relname FROM pg_class WHERE relname=lower(c_table)) THEN
 RAISE NOTICE 'values out of range partition, creating partition table: partition_tab.%',c_table;

 chk_cond := new_name||'%'; 
 raise info 'chk_cond %',chk_cond;

 EXECUTE 'CREATE TABLE partition_tab.' || c_table || '(check ( name like '''|| chk_cond||''')) INHERITS (' ||TG_TABLE_NAME|| ');';


 END IF;
 
 EXECUTE 'INSERT INTO ' || c_table1 || ' SELECT(' || m_table1 || ' ' || quote_literal(NEW) || ').* RETURNING id;';
 END IF;
 RETURN NULL;
 END;
$BODY$;

CREATE TRIGGER t1_trigger
 BEFORE INSERT OR UPDATE
 ON t1
 FOR EACH ROW
 EXECUTE PROCEDURE partition_tab.func_t1_insert_trigger()


examples: 




Any suggestions.


Thanks,
Rj



 

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