KingbaseES 分区表修改字段类型
KingbaseES普通表修改表结构请参考：KingbaseES变更表结构表重写问题
数据类型转换重写与不重写：
- varchar(x) 转换到 varchar(y) 当 y>=x，不需要重写。
- numeric(x,z) 转换到 numeric(y,z) 当 y>=x，或者不指定精度类型，不需要重写。
- numeric(x,c) 转换到 numeric(y,z) 当 y=x c>z，当numeric数据类型标度不一致时，需要重写。
- varbit(x) 转换到 varbit(y) 当 y>=x，不需要重写。
- timestamp(x) 转换到 timestamp(y) 当 y>=x，或者转换为timestamp，不需要重写。
- timestamptz(x) 转换到 timestamptz(y) 当 y>=x，或者转换为timestamptz，不需要重写。
- interval(x) 转换到 interval(y) 当 y>=x ，或者转换为interval，不需要重写。
- timestamp 转换到 text、varchar、varchar(n)，char(n)，需要重写。
- timestamp(x)转换到 text、varchar、varchar(n)、char(n)，n>=x，需要重写。
- text 转换到 char、char(x)、varchar(n)，需要重写。
- text 转换到 varchar，不需要重写。
- numeric(x) 转换到 numeric(y)，y>=x，不需要重写。
- numeric(x) 转换到 numeric，不需要重写。
- numeric(x,y) 转换到 numeric，不需要重写。
一、普通表的修改：
普通表数据类型长度或者精度由小改大表不会重写，索引也不会重写。
test=# create table t01(id int,name varchar(10));
CREATE TABLE
test=# insert into t01 select generate_series(1,10),substr(md5(random()::text),1,10);
INSERT 0 10
test=# create index on t01 (name);
CREATE INDEX
test=# \d t01
Table "public.t01"
Column | Type | Collation | Nullable | Default
--------+----------------------------+-----------+----------+---------
id | integer | | |
name | character varying(10 char) | | |
Indexes:
"t01_name_idx" btree (name)
test=#
test=# select sys_relation_filenode('t01'),sys_relation_filenode('t01_name_idx');
SYS_RELATION_FILENODE | SYS_RELATION_FILENODE
-----------------------+-----------------------
289043 | 289046
(1 row)
# 设置客户端消息级别client_min_messages=debug5
test=# set client_min_messages=debug5;
# 修改t01表name字段长度varchar(10)为varchar(15)
test=# alter table t01 alter column name type varchar(15);
DEBUG: StartTransaction(1) name: unnamed; blockState: DEFAULT; state: INPROGRESS, xid/subid/cid: 0/1/0
DEBUG: EventTriggerInvoke 267860
DEBUG: rehashing catalog cache id 68 for sys_recyclebin; 33 tups, 16 buckets
DEBUG: EventTriggerInvoke 13761
DEBUG: CommitTransaction(1) name: unnamed; blockState: STARTED; state: INPROGRESS, xid/subid/cid: 428092/1/7
ALTER TABLE
test=# select sys_relation_filenode('t01'),sys_relation_filenode('t01_name_idx');
DEBUG: StartTransaction(1) name: unnamed; blockState: DEFAULT; state: INPROGRESS, xid/subid/cid: 0/1/0
DEBUG: CommitTransaction(1) name: unnamed; blockState: STARTED; state: INPROGRESS, xid/subid/cid: 0/1/0
SYS_RELATION_FILENODE | SYS_RELATION_FILENODE
-----------------------+-----------------------
289043 | 289046
(1 row)
test=#
分区表修改表结构是否跟普通表一样？
二、分区表的修改：
分区表分区键无法修改数据类型，本测试只针对非分区键进行测试。
create table tb(id bigint,pdate date,info varchar2(10)) partition by range(pdate) INTERVAL ('1 MONTH'::INTERVAL)
(
PARTITION tb_p0 VALUES LESS THAN ('2023-01-01'),
PARTITION tb_p1 VALUES LESS THAN ('2023-02-01'),
PARTITION tb_p2 VALUES LESS THAN ('2023-03-01'),
PARTITION tb_p3 VALUES LESS THAN ('2023-04-01')
);
CREATE TABLE
insert into tb select generate_series(1,100),'2023-01-01'::date,substr(md5(random()::text),1,10);
INSERT 0 100
insert into tb select generate_series(101,200),'2023-02-01'::date,substr(md5(random()::text),1,10);
INSERT 0 100
insert into tb select generate_series(201,300),'2023-03-01'::date,substr(md5(random()::text),1,10);
INSERT 0 100
2.1.分区表非索引列数据类型的修改：
修改非索引列的类型：由小改大，表不会发生重写，索引自然也没有发生重写。
修改非索引列的类型：由大改小，遵循KingbaseES变更表结构表重写规则，表需要重写，索引也需要重写。
test=# set client_min_messages =debug5;
DEBUG: CommitTransaction(1) name: unnamed; blockState: STARTED; state: INPROGRESS, xid/subid/cid: 0/1/0
SET
test=# select oid,relname from sys_class where relname='tb';
DEBUG: StartTransaction(1) name: unnamed; blockState: DEFAULT; state: INPROGRESS, xid/subid/cid: 0/1/0
DEBUG: CommitTransaction(1) name: unnamed; blockState: STARTED; state: INPROGRESS, xid/subid/cid: 0/1/0
OID | RELNAME
--------+---------
289063 | tb
(1 row)
test=# select oid,relname from sys_class where relname='tb_tb_p0';
DEBUG: StartTransaction(1) name: unnamed; blockState: DEFAULT; state: INPROGRESS, xid/subid/cid: 0/1/0
DEBUG: CommitTransaction(1) name: unnamed; blockState: STARTED; state: INPROGRESS, xid/subid/cid: 0/1/0
OID | RELNAME
--------+----------
289066 | tb_tb_p0
(1 row)
test=# select oid,relname from sys_class where relname='tb_tb_p1';
DEBUG: StartTransaction(1) name: unnamed; blockState: DEFAULT; state: INPROGRESS, xid/subid/cid: 0/1/0
DEBUG: CommitTransaction(1) name: unnamed; blockState: STARTED; state: INPROGRESS, xid/subid/cid: 0/1/0
OID | RELNAME
--------+----------
289069 | tb_tb_p1
(1 row)
test=# select oid,relname from sys_class where relname='tb_tb_p2';
DEBUG: StartTransaction(1) name: unnamed; blockState: DEFAULT; state: INPROGRESS, xid/subid/cid: 0/1/0
DEBUG: CommitTransaction(1) name: unnamed; blockState: STARTED; state: INPROGRESS, xid/subid/cid: 0/1/0
OID | RELNAME
--------+----------
289072 | tb_tb_p2
(1 row)
test=# select oid,relname from sys_class where relname='tb_tb_p3';
DEBUG: StartTransaction(1) name: unnamed; blockState: DEFAULT; state: INPROGRESS, xid/subid/cid: 0/1/0
DEBUG: CommitTransaction(1) name: unnamed; blockState: STARTED; state: INPROGRESS, xid/subid/cid: 0/1/0
OID | RELNAME
--------+----------
289075 | tb_tb_p3
(1 row)
# 修改tb分区表info列为varchar(20)
test=# alter table tb alter column info type varchar(20);
DEBUG: StartTransaction(1) name: unnamed; blockState: DEFAULT; state: INPROGRESS, xid/subid/cid: 0/1/0
DEBUG: EventTriggerInvoke 267860
DEBUG: EventTriggerInvoke 13761
DEBUG: CommitTransaction(1) name: unnamed; blockState: STARTED; state: INPROGRESS, xid/subid/cid: 428111/1/10
ALTER TABLE
test=# select oid,relname from sys_class where relname='tb';
DEBUG: StartTransaction(1) name: unnamed; blockState: DEFAULT; state: INPROGRESS, xid/subid/cid: 0/1/0
DEBUG: CommitTransaction(1) name: unnamed; blockState: STARTED; state: INPROGRESS, xid/subid/cid: 0/1/0
OID | RELNAME
--------+---------
289063 | tb
(1 row)
test=# select oid,relname from sys_class where relname='tb_tb_p0';
DEBUG: StartTransaction(1) name: unnamed; blockState: DEFAULT; state: INPROGRESS, xid/subid/cid: 0/1/0
DEBUG: CommitTransaction(1) name: unnamed; blockState: STARTED; state: INPROGRESS, xid/subid/cid: 0/1/0
OID | RELNAME
--------+----------
289066 | tb_tb_p0
(1 row)
test=# select oid,relname from sys_class where relname='tb_tb_p1';
DEBUG: StartTransaction(1) name: unnamed; blockState: DEFAULT; state: INPROGRESS, xid/subid/cid: 0/1/0
DEBUG: CommitTransaction(1) name: unnamed; blockState: STARTED; state: INPROGRESS, xid/subid/cid: 0/1/0
OID | RELNAME
--------+----------
289069 | tb_tb_p1
(1 row)
test=# select oid,relname from sys_class where relname='tb_tb_p2';
DEBUG: StartTransaction(1) name: unnamed; blockState: DEFAULT; state: INPROGRESS, xid/subid/cid: 0/1/0
DEBUG: CommitTransaction(1) name: unnamed; blockState: STARTED; state: INPROGRESS, xid/subid/cid: 0/1/0
OID | RELNAME
--------+----------
289072 | tb_tb_p2
(1 row)
test=# select oid,relname from sys_class where relname='tb_tb_p3';
DEBUG: StartTransaction(1) name: unnamed; blockState: DEFAULT; state: INPROGRESS, xid/subid/cid: 0/1/0
DEBUG: CommitTransaction(1) name: unnamed; blockState: STARTED; state: INPROGRESS, xid/subid/cid: 0/1/0
OID | RELNAME
--------+----------
289075 | tb_tb_p3
(1 row)
test=# alter table tb alter column info type varchar(30);
DEBUG: StartTransaction(1) name: unnamed; blockState: DEFAULT; state: INPROGRESS, xid/subid/cid: 0/1/0
DEBUG: EventTriggerInvoke 267860
DEBUG: EventTriggerInvoke 13761
DEBUG: CommitTransaction(1) name: unnamed; blockState: STARTED; state: INPROGRESS, xid/subid/cid: 428112/1/10
ALTER TABLE
test=# select oid,relname from sys_class where relname='tb';
DEBUG: StartTransaction(1) name: unnamed; blockState: DEFAULT; state: INPROGRESS, xid/subid/cid: 0/1/0
DEBUG: CommitTransaction(1) name: unnamed; blockState: STARTED; state: INPROGRESS, xid/subid/cid: 0/1/0
OID | RELNAME
--------+---------
289063 | tb
(1 row)
test=# select oid,relname from sys_class where relname='tb_tb_p0';
DEBUG: StartTransaction(1) name: unnamed; blockState: DEFAULT; state: INPROGRESS, xid/subid/cid: 0/1/0
DEBUG: CommitTransaction(1) name: unnamed; blockState: STARTED; state: INPROGRESS, xid/subid/cid: 0/1/0
OID | RELNAME
--------+----------
289066 | tb_tb_p0
(1 row)
test=# select oid,relname from sys_class where relname='tb_tb_p1';
DEBUG: StartTransaction(1) name: unnamed; blockState: DEFAULT; state: INPROGRESS, xid/subid/cid: 0/1/0
DEBUG: CommitTransaction(1) name: unnamed; blockState: STARTED; state: INPROGRESS, xid/subid/cid: 0/1/0
OID | RELNAME
--------+----------
289069 | tb_tb_p1
(1 row)
test=# select oid,relname from sys_class where relname='tb_tb_p2';
DEBUG: StartTransaction(1) name: unnamed; blockState: DEFAULT; state: INPROGRESS, xid/subid/cid: 0/1/0
DEBUG: CommitTransaction(1) name: unnamed; blockState: STARTED; state: INPROGRESS, xid/subid/cid: 0/1/0
OID | RELNAME
--------+----------
289072 | tb_tb_p2
(1 row)
test=# select oid,relname from sys_class where relname='tb_tb_p3';
DEBUG: StartTransaction(1) name: unnamed; blockState: DEFAULT; state: INPROGRESS, xid/subid/cid: 0/1/0
DEBUG: CommitTransaction(1) name: unnamed; blockState: STARTED; state: INPROGRESS, xid/subid/cid: 0/1/0
OID | RELNAME
--------+----------
289075 | tb_tb_p3
(1 row)
分区表修改非索引列字段长度或者是精度由小变大，跟普通表一样，不需要重写。
2.2.分区表全局（GLOBAL）索引列数据类型的修改：
修改全局（GLOBAL）索引列的类型：由小改大，表不会发生重写，索引也没有发生重写。
修改全局（GLOBAL）索引列的类型：由大改小，遵循KingbaseES变更表结构表重写规则，表需要重写，索引也需要重写。
test=# \d+ tb
Partitioned table "public.tb"
Column | Type | Collation | Nullable | Default | Storage | Stats target | Description
--------+----------------------------+-----------+----------+---------+----------+--------------+-------------
id | bigint | | | | plain | |
pdate | date | | | | plain | |
info | character varying(10 char) | | not null | | extended | |
Partition key: RANGE (pdate)
Range interval: INTERVAL ('0-1'::pg_catalog.interval)
Partitions: tb_tb_p0 FOR VALUES FROM (MINVALUE) TO ('2023-01-01 00:00:00'),
tb_tb_p1 FOR VALUES FROM ('2023-01-01 00:00:00') TO ('2023-02-01 00:00:00'),
tb_tb_p2 FOR VALUES FROM ('2023-02-01 00:00:00') TO ('2023-03-01 00:00:00'),
tb_tb_p3 FOR VALUES FROM ('2023-03-01 00:00:00') TO ('2023-04-01 00:00:00')
# 添加主键
test=# alter table tb add constraint tb_pk primary key (info);
ALTER TABLE
test=# \d+ tb
Partitioned table "public.tb"
Column | Type | Collation | Nullable | Default | Storage | Stats target | Description
--------+----------------------------+-----------+----------+---------+----------+--------------+-------------
id | bigint | | | | plain | |
pdate | date | | | | plain | |
info | character varying(10 char) | | not null | | extended | |
Partition key: RANGE (pdate)
Range interval: INTERVAL ('0-1'::pg_catalog.interval)
Indexes:
"tb_pk" PRIMARY KEY, btree (info) INCLUDE (tableoid) GLOBAL
Partitions: tb_tb_p0 FOR VALUES FROM (MINVALUE) TO ('2023-01-01 00:00:00'),
tb_tb_p1 FOR VALUES FROM ('2023-01-01 00:00:00') TO ('2023-02-01 00:00:00'),
tb_tb_p2 FOR VALUES FROM ('2023-02-01 00:00:00') TO ('2023-03-01 00:00:00'),
tb_tb_p3 FOR VALUES FROM ('2023-03-01 00:00:00') TO ('2023-04-01 00:00:00')
test=# select sys_relation_filepath('tb_pk');
SYS_RELATION_FILEPATH
-----------------------
base/12176/289111
(1 row)
test=# select oid,relname from sys_class where relname='tb';
OID | RELNAME
--------+---------
289063 | tb
(1 row)
test=# select oid,relname from sys_class where relname='tb_tb_p0';
OID | RELNAME
--------+----------
289066 | tb_tb_p0
(1 row)
test=# select oid,relname from sys_class where relname='tb_tb_p1';
OID | RELNAME
--------+----------
289069 | tb_tb_p1
(1 row)
test=# select oid,relname from sys_class where relname='tb_tb_p2';
OID | RELNAME
--------+----------
289072 | tb_tb_p2
(1 row)
test=# select oid,relname from sys_class where relname='tb_tb_p3';
OID | RELNAME
--------+----------
289075 | tb_tb_p3
(1 row)
test=# alter table tb alter info type varchar(20);
DEBUG: StartTransaction(1) name: unnamed; blockState: DEFAULT; state: INPROGRESS, xid/subid/cid: 0/1/0
DEBUG: EventTriggerInvoke 267860
DEBUG: drop auto-cascades to index tb_pk
DEBUG: EventTriggerInvoke 13761
DEBUG: CommitTransaction(1) name: unnamed; blockState: STARTED; state: INPROGRESS, xid/subid/cid: 428121/1/19
ALTER TABLE
test=# select sys_relation_filepath('tb_pk');
DEBUG: StartTransaction(1) name: unnamed; blockState: DEFAULT; state: INPROGRESS, xid/subid/cid: 0/1/0
DEBUG: CommitTransaction(1) name: unnamed; blockState: STARTED; state: INPROGRESS, xid/subid/cid: 0/1/0
SYS_RELATION_FILEPATH
-----------------------
base/12176/289111
(1 row)
test=# select oid,relname from sys_class where relname='tb';
DEBUG: StartTransaction(1) name: unnamed; blockState: DEFAULT; state: INPROGRESS, xid/subid/cid: 0/1/0
DEBUG: CommitTransaction(1) name: unnamed; blockState: STARTED; state: INPROGRESS, xid/subid/cid: 0/1/0
OID | RELNAME
--------+---------
289063 | tb
(1 row)
test=# select oid,relname from sys_class where relname='tb_tb_p2';
DEBUG: StartTransaction(1) name: unnamed; blockState: DEFAULT; state: INPROGRESS, xid/subid/cid: 0/1/0
DEBUG: CommitTransaction(1) name: unnamed; blockState: STARTED; state: INPROGRESS, xid/subid/cid: 0/1/0
OID | RELNAME
--------+----------
289072 | tb_tb_p2
(1 row)
# 添加全局索引
test=# create unique index on tb(id,info) global;
DEBUG: StartTransaction(1) name: unnamed; blockState: DEFAULT; state: INPROGRESS, xid/subid/cid: 0/1/0
DEBUG: EventTriggerInvoke 267860
DEBUG: building index "tb_id_info_idx" on table "tb" serially
DEBUG: EventTriggerInvoke 13761
DEBUG: CommitTransaction(1) name: unnamed; blockState: STARTED; state: INPROGRESS, xid/subid/cid: 428122/1/4
CREATE INDEX
test=# \d+ tb
Partitioned table "public.tb"
Column | Type | Collation | Nullable | Default | Storage | Stats target | Description
--------+----------------------------+-----------+----------+---------+----------+--------------+-------------
id | bigint | | | | plain | |
pdate | date | | | | plain | |
info | character varying(20 char) | | not null | | extended | |
Partition key: RANGE (pdate)
Range interval: INTERVAL ('0-1'::pg_catalog.interval)
Indexes:
"tb_pk" PRIMARY KEY, btree (info) INCLUDE (tableoid) GLOBAL
"tb_id_info_idx" UNIQUE, btree (id, info) INCLUDE (tableoid) GLOBAL
Partitions: tb_tb_p0 FOR VALUES FROM (MINVALUE) TO ('2023-01-01 00:00:00'),
tb_tb_p1 FOR VALUES FROM ('2023-01-01 00:00:00') TO ('2023-02-01 00:00:00'),
tb_tb_p2 FOR VALUES FROM ('2023-02-01 00:00:00') TO ('2023-03-01 00:00:00'),
tb_tb_p3 FOR VALUES FROM ('2023-03-01 00:00:00') TO ('2023-04-01 00:00:00')
test=# select sys_relation_filepath('tb_pk');
DEBUG: StartTransaction(1) name: unnamed; blockState: DEFAULT; state: INPROGRESS, xid/subid/cid: 0/1/0
DEBUG: CommitTransaction(1) name: unnamed; blockState: STARTED; state: INPROGRESS, xid/subid/cid: 0/1/0
SYS_RELATION_FILEPATH
-----------------------
base/12176/289111
(1 row)
test=# select sys_relation_filepath('tb_id_info_idx');
DEBUG: StartTransaction(1) name: unnamed; blockState: DEFAULT; state: INPROGRESS, xid/subid/cid: 0/1/0
DEBUG: CommitTransaction(1) name: unnamed; blockState: STARTED; state: INPROGRESS, xid/subid/cid: 0/1/0
SYS_RELATION_FILEPATH
-----------------------
base/12176/289115
(1 row)
test=# alter table tb alter info type varchar(30);
DEBUG: StartTransaction(1) name: unnamed; blockState: DEFAULT; state: INPROGRESS, xid/subid/cid: 0/1/0
DEBUG: EventTriggerInvoke 267860
DEBUG: drop auto-cascades to index tb_pk
DEBUG: EventTriggerInvoke 13761
DEBUG: CommitTransaction(1) name: unnamed; blockState: STARTED; state: INPROGRESS, xid/subid/cid: 428123/1/27
ALTER TABLE
test=# select sys_relation_filepath('tb_pk');
DEBUG: StartTransaction(1) name: unnamed; blockState: DEFAULT; state: INPROGRESS, xid/subid/cid: 0/1/0
DEBUG: CommitTransaction(1) name: unnamed; blockState: STARTED; state: INPROGRESS, xid/subid/cid: 0/1/0
SYS_RELATION_FILEPATH
-----------------------
base/12176/289111
(1 row)
test=# select sys_relation_filepath('tb_id_info_idx');
DEBUG: StartTransaction(1) name: unnamed; blockState: DEFAULT; state: INPROGRESS, xid/subid/cid: 0/1/0
DEBUG: CommitTransaction(1) name: unnamed; blockState: STARTED; state: INPROGRESS, xid/subid/cid: 0/1/0
SYS_RELATION_FILEPATH
-----------------------
base/12176/289115
(1 row)
分区表修改全局（GLOBAL）索引列字段长度或者是精度由小变大，跟普通表一样，不需要重写。
2.3.分区表本地（LOCAL）索引列数据类型的修改：
修改本地（LOCAL）索引列的类型：由小改大，表不会发生重写，索引发生重写。
修改本地（LOCAL）索引列的类型：由大改小，遵循KingbaseES变更表结构表重写规则，表需要重写，索引也需要重写。
test=# \d+ tb
Partitioned table "public.tb"
Column | Type | Collation | Nullable | Default | Storage | Stats target | Description
--------+----------------------------+-----------+----------+---------+----------+--------------+-------------
id | bigint | | | | plain | |
pdate | date | | | | plain | |
info | character varying(30 char) | | not null | | extended | |
Partition key: RANGE (pdate)
Range interval: INTERVAL ('0-1'::pg_catalog.interval)
Indexes:
"tb_pk" PRIMARY KEY, btree (info) INCLUDE (tableoid) GLOBAL
"tb_id_info_idx" UNIQUE, btree (id, info) INCLUDE (tableoid) GLOBAL
Partitions: tb_tb_p0 FOR VALUES FROM (MINVALUE) TO ('2023-01-01 00:00:00'),
tb_tb_p1 FOR VALUES FROM ('2023-01-01 00:00:00') TO ('2023-02-01 00:00:00'),
tb_tb_p2 FOR VALUES FROM ('2023-02-01 00:00:00') TO ('2023-03-01 00:00:00'),
tb_tb_p3 FOR VALUES FROM ('2023-03-01 00:00:00') TO ('2023-04-01 00:00:00')
# 创建本地索引
test=# create index on tb(pdate,info);
DEBUG: StartTransaction(1) name: unnamed; blockState: DEFAULT; state: INPROGRESS, xid/subid/cid: 0/1/0
DEBUG: EventTriggerInvoke 267860
DEBUG: building index "tb_tb_p0_pdate_info_idx" on table "tb_tb_p0" serially
DEBUG: building index "tb_tb_p1_pdate_info_idx" on table "tb_tb_p1" serially
DEBUG: building index "tb_tb_p2_pdate_info_idx" on table "tb_tb_p2" serially
DEBUG: building index "tb_tb_p3_pdate_info_idx" on table "tb_tb_p3" serially
DEBUG: EventTriggerInvoke 13761
DEBUG: CommitTransaction(1) name: unnamed; blockState: STARTED; state: INPROGRESS, xid/subid/cid: 428125/1/12
CREATE INDEX
test=# \d+ tb
Partitioned table "public.tb"
Column | Type | Collation | Nullable | Default | Storage | Stats target | Description
--------+----------------------------+-----------+----------+---------+----------+--------------+-------------
id | bigint | | | | plain | |
pdate | date | | | | plain | |
info | character varying(30 char) | | not null | | extended | |
Partition key: RANGE (pdate)
Range interval: INTERVAL ('0-1'::pg_catalog.interval)
Indexes:
"tb_pk" PRIMARY KEY, btree (info) INCLUDE (tableoid) GLOBAL
"tb_id_info_idx" UNIQUE, btree (id, info) INCLUDE (tableoid) GLOBAL
"tb_pdate_info_idx" btree (pdate, info)
Partitions: tb_tb_p0 FOR VALUES FROM (MINVALUE) TO ('2023-01-01 00:00:00'),
tb_tb_p1 FOR VALUES FROM ('2023-01-01 00:00:00') TO ('2023-02-01 00:00:00'),
tb_tb_p2 FOR VALUES FROM ('2023-02-01 00:00:00') TO ('2023-03-01 00:00:00'),
tb_tb_p3 FOR VALUES FROM ('2023-03-01 00:00:00') TO ('2023-04-01 00:00:00')
test=# select sys_relation_filepath('tb_pk'),sys_relation_filepath('tb_id_info_idx');
DEBUG: StartTransaction(1) name: unnamed; blockState: DEFAULT; state: INPROGRESS, xid/subid/cid: 0/1/0
DEBUG: CommitTransaction(1) name: unnamed; blockState: STARTED; state: INPROGRESS, xid/subid/cid: 0/1/0
SYS_RELATION_FILEPATH | SYS_RELATION_FILEPATH
-----------------------+-----------------------
base/12176/289111 | base/12176/289115
(1 row)
test=# select oid,relname from sys_class where relname='tb_pdate_info_idx';
DEBUG: StartTransaction(1) name: unnamed; blockState: DEFAULT; state: INPROGRESS, xid/subid/cid: 0/1/0
DEBUG: CommitTransaction(1) name: unnamed; blockState: STARTED; state: INPROGRESS, xid/subid/cid: 0/1/0
OID | RELNAME
--------+-------------------
289119 | tb_pdate_info_idx
(1 row)
# 修改本地索引依赖info列
test=# alter table tb alter info type varchar(40);
DEBUG: StartTransaction(1) name: unnamed; blockState: DEFAULT; state: INPROGRESS, xid/subid/cid: 0/1/0
DEBUG: EventTriggerInvoke 267860
DEBUG: drop auto-cascades to index tb_tb_p0_pdate_info_idx
DEBUG: drop auto-cascades to index tb_tb_p1_pdate_info_idx
DEBUG: drop auto-cascades to index tb_tb_p2_pdate_info_idx
DEBUG: rehashing catalog cache id 68 for sys_recyclebin; 33 tups, 16 buckets
DEBUG: drop auto-cascades to index tb_tb_p3_pdate_info_idx
DEBUG: drop auto-cascades to index tb_pk
DEBUG: building index "tb_tb_p0_pdate_info_idx" on table "tb_tb_p0" serially
DEBUG: building index "tb_tb_p1_pdate_info_idx" on table "tb_tb_p1" serially
DEBUG: building index "tb_tb_p2_pdate_info_idx" on table "tb_tb_p2" serially
DEBUG: building index "tb_tb_p3_pdate_info_idx" on table "tb_tb_p3" serially
DEBUG: EventTriggerInvoke 13761
DEBUG: CommitTransaction(1) name: unnamed; blockState: STARTED; state: INPROGRESS, xid/subid/cid: 428127/1/51
ALTER TABLE
test=# select sys_relation_filepath('tb_pk'),sys_relation_filepath('tb_id_info_idx');
DEBUG: StartTransaction(1) name: unnamed; blockState: DEFAULT; state: INPROGRESS, xid/subid/cid: 0/1/0
DEBUG: CommitTransaction(1) name: unnamed; blockState: STARTED; state: INPROGRESS, xid/subid/cid: 0/1/0
SYS_RELATION_FILEPATH | SYS_RELATION_FILEPATH
-----------------------+-----------------------
base/12176/289111 | base/12176/289115
(1 row)
test=# select oid,relname from sys_class where relname='tb_pdate_info_idx';
DEBUG: StartTransaction(1) name: unnamed; blockState: DEFAULT; state: INPROGRESS, xid/subid/cid: 0/1/0
DEBUG: CommitTransaction(1) name: unnamed; blockState: STARTED; state: INPROGRESS, xid/subid/cid: 0/1/0
OID | RELNAME
--------+-------------------
289127 | tb_pdate_info_idx
(1 row)
test=#
分区表本地（LOCAL）索引列修改字段长度或者是精度由小变大，表、全局索引不需要重写，但是本地索引需要重写。
2.4.分区表修改表结构总结：
分区表修改非索引列字段长度或者是精度由小变大，跟普通表一样，不需要重写。
分区表修改全局（GLOBAL）索引列字段长度或者是精度由小变大，跟普通表一样，不需要重写。
分区表本地（LOCAL）索引列修改字段长度或者是精度由小变大，表、全局索引不需要重写，但是本地索引需要重写。
三、分区表变更表结构的思考：
通过以上测试可知：分区表修改本地索引依赖字段长度或者标度会导致索引重写。
如果分区表数据量大、子分区多、字段列依赖的索引多，修改分区表（本地索引）列字段长度会发生如下问题：
修改字段长度由小到大：分区表所有的子表不会发生重写，但是索引会发生重写，索引越多阻塞时间越长。
目前想到的解决方法：删除被修改列依赖的所有本地索引，避免长时间的AccessExclusiveLock，修改完成后子表使用concurrently的方式创建。
修改字段长度由大到小：分区表所有的子表都会发生重写，只要表发生重写所有的索引都需要重写，此过程会导致业务不可用（影响太大）。
对分区表使用detach？分区表要求所有子分区的表结构必须跟父表一致，所有的子分区全部修改完成后再attach回去，跟直接改区别不大，可以避免业务中断。需要根据业务提前准备好脚本。
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