Re: Detach Partition produces a --> SQL-Fehler [XX000]: ERROR: could not find ON INSERT check triggers of foreign key constraint 76908

Baehler Thomas SBB CFF FFS <thomas(dot)baehler2(at)sbb(dot)ch> 于2024年4月5日周五 21:56写道：

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> *Hi all Version: PostgreSQL 16.2 on x86_64-pc-linux-gnu, compiled by gcc
> (GCC) 7.3.1 20180712 (Red Hat 7.3.1-12), 64-bit I want to drop old
> partitions but keep some few data. *
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> *I copy them to a partition called (_old). *
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> A small reproducer….
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> *drop table b cascade;*
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> *drop table a;*
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> *CREATE TABLE a (*
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> * id int not null,*
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> * logdate date not null,*
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> * fk_b_id int,*
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> * fk_b_logdate date *
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> *) PARTITION BY RANGE (logdate);*
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> *CREATE TABLE a_03 PARTITION OF a*
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> * FOR VALUES FROM ('2024-03-01') TO ('2024-04-01');*
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> *CREATE TABLE a_02 PARTITION OF a*
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> * FOR VALUES FROM ('2024-02-01') TO ('2024-03-01');*
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> *CREATE TABLE a_01 PARTITION OF a*
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> * FOR VALUES FROM ('2024-01-01') TO ('2024-02-01');*
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> *CREATE TABLE a_old PARTITION OF a*
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> * FOR VALUES FROM ('2023-01-01') TO ('2024-01-01');*
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> *CREATE TABLE b (*
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> * id int not null,*
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> * logdate date not null*
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> *) PARTITION BY RANGE (logdate);*
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> *CREATE TABLE b_03 PARTITION OF b*
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> * FOR VALUES FROM ('2024-03-01') TO ('2024-04-01');*
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> *CREATE TABLE b_02 PARTITION OF b*
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> * FOR VALUES FROM ('2024-02-01') TO ('2024-03-01');*
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> *CREATE TABLE b_01 PARTITION OF b*
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> * FOR VALUES FROM ('2024-01-01') TO ('2024-02-01');*
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> *CREATE TABLE b_old PARTITION OF b*
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> * FOR VALUES FROM ('2023-01-01') TO ('2024-01-01');*
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> *alter table b add primary key (id, logdate);*
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> *ALTER TABLE a ADD CONSTRAINT fk_to_b FOREIGN KEY (fk_b_id, fk_b_logdate)
> REFERENCES b (id, logdate);*
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> *insert into b values (0, '2024-02-20');*
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> *insert into a values (0, '2024-02-20', 0, '2024-02-20');*
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> *alter table a detach partition a_old;*
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> *alter table a detach partition a_01;*
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> *alter table b detach partition b_old;*
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> *alter table b detach partition b_01;*
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> *alter table b attach partition b_old FOR VALUES FROM ('2023-01-01') TO
> ('2024-02-01');*
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> *alter table a attach partition a_old FOR VALUES FROM ('2023-01-01') TO
> ('2024-02-01');*
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> *insert into b select * from b_01;*
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> *insert into a select * from a_01;*
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> *drop table a_01;*
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> *drop table b_01;*
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> *select * from b_02; -- until here everything is fine. *
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> *set constraints all deferred ;*
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> *alter table a detach partition a_old; **** here this empty partition
> cannot be detached the error XX000 appears.*
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> *alter table a detach partition a_02;*
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> *alter table b detach partition b_old;*
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> *alter table b detach partition b_02;*
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> *alter table b attach partition b_old FOR VALUES FROM ('2023-01-01') TO
> ('2024-03-01');*
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> *alter table a attach partition a_old FOR VALUES FROM ('2023-01-01') TO
> ('2024-03-01');*
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> *insert into b select * from b_02;*
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> *insert into a select * from a_02;*
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> *drop table a_02;*
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> *drop table b_02;*
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> *select * from a;*
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> I should always be able to detach the ‘a’ partition empty or not.
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The issue you reported seems to be similar to [1]. I analyzed this issue
in that thread and privoded a
patch int [2]. But it had more problem when deattach partition with FK.

[1] https://www.postgresql.org/message-id/20230705233028.2f554f73%40karst
[2]
https://www.postgresql.org/message-id/CAHewXNnZkxCwpOW25FXnOF96-5QBLJ-_q5aipvkYtq0DFJavWw%40mail.gmail.com
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