现有表上的分区出现错误“在规则中检测到无限递归”

问题描述

--现有数据

create table tbl_Master
(
    col_Date date not null,id int not null,value int not null
);

insert into tbl_Master values('2021-01-14',10,21);
insert into tbl_Master values('2020-09-30',11,22);
insert into tbl_Master values('2021-11-28',12,23);

--更改表名

alter table tbl_Master rename to tbl_Master_old;

--按范围分区再次创建主表

create table tbl_Master(
    col_Date date not null,value int not null
) partition by range (col_Date);

--功能：

create or replace function fn_create_partition(col_Date date) returns void
as 
$body$

declare v_startDate date := date_trunc('month',col_Date)::date;
declare v_EndDate date := (v_startDate + interval '1 month')::date;
declare tableName text := 'tbl_Master_Part_' || to_char(col_Date,'YYYYmm');

begin
    if to_regclass(tableName) is null then
    execute format('create table %I partition of tbl_Master for values from (%L) to (%L)',tableName,v_startDate,v_EndDate);
    end if;
end;
$body$ 
language plpgsql;

--为现有数据创建分区表

do
$$
declare rec record;
begin
    for rec in select distinct date_trunc('month',col_Date)::date yearmonth from tbl_Master_old 
    loop
    perform fn_create_partition(rec.yearmonth);
    end loop;
end
$$;

--插入备份数据

insert into tbl_Master (col_Date,id,value) select * from tbl_Master_old;

--当我插入记录时

insert into tbl_Master values('2021-02-22',22);

出现错误：

ERROR: no partition of relation "tbl_master" found for row DETAIL: Partition key of the failing row contains (col_date) = (2021-02-22).

所以我为此创建了规则：

--规则

create or replace rule rule_fn_create_partition as on insert
to tbl_Master
do instead 
(
select fn_create_partition(NEW.col_Date);
insert into tbl_Master values(New.*)
);

--当我插入记录时

insert into tbl_Master values('2021-02-22',22);

出现错误：

ERROR: infinite recursion detected in rules for relation "tbl_master"

解决方法

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data-partitioning postgresql-11