GreenPlum中元数据查询

-- GP数据库表结构查询SQL语句
select 
       attname, -- 字段名
       typname,-- 类型
       CASE WHEN pg_truetypmod = -1 /* default typmod */
       THEN null
       WHEN pg_truetypid IN (1042, 1043) /* char, varchar */
       THEN pg_truetypmod - 4
       WHEN pg_truetypid IN (1560, 1562) /* bit, varbit */
       THEN pg_truetypmod
       ELSE null end type_max_length, -- 获取变长类型最大长度
       is_null,  -- 是否空
       default_data, -- 默认值
       isunique,  -- 是否唯一索引
       isprimary, -- 是否主键
       is_index,  --是否索引
       distribution,  -- 是否分布键
       description  -- 注释
from 
( 
SELECT   
         t1.attname,
         t2.typname,
         case when t1.attnotnull=true then 'Y' else '' end is_null ,
         t3.description,
         t4.adbin as default_data, -- 默认值
         case when t5.attrnums is not null then 'Y' else null end distribution, -- 分布键
         t6.indisunique isunique,
         t6.indisprimary isprimary,
         case when t6.indkey is not null then 'Y' else null end is_index,
         t1.attnum, -- 字段位置顺序
         CASE WHEN t2.typtype = 'd' THEN t2.typbasetype ELSE t1.atttypid END pg_truetypid, 
         CASE WHEN t2.typtype = 'd' THEN t2.typtypmod ELSE t1.atttypmod END  pg_truetypmod 
     FROM
           pg_attribute t1 -- 属性
           left join pg_type t2  on t1.atttypid = t2.oid -- 类型
           left join "pg_catalog"."pg_description" t3 on  t1.attrelid=t3.objoid and t3.objsubid = t1.attnum -- 注释
           left join pg_attrdef  t4 on t4.adrelid = t1.attrelid AND t4.adnum = t1.attnum -- 默认值
           left join gp_distribution_policy  t5 on t5.localoid = t1.attrelid and t1.attnum = any(t5.attrnums) -- 分布键
           left join pg_index t6 on t6.indrelid=t1.attrelid and t1.attnum = any(t6.indkey)  -- 索引，主键等
     WHERE
           t1.attnum > 0
       AND t1.attisdropped <> 't'
       and t1.attrelid= 'app_deng.bi_of_data'::regclass
) tt
order by attnum

-- 查看range分区表
SELECT 
    pp.parrelid::regclass table_name,
    pr1.parchildrelid::regclass child_tbl_name,
    pr1.parname as partition_name,
    pr1.parruleord as partitionposition,
    translate(pg_get_expr(pr1.parrangestart,pr1.parchildrelid),'-'':date character varying bpchar numeric double percision timestamp without time zone','') as partitionrangestart,
    translate(pg_get_expr(pr1.parrangeend,pr1.parchildrelid),'-'':date character varying bpchar numeric double percision timestamp without time zone','') as partitionrangeend,
    substring(parrangeend,'consttype ([0-9]+)')::integer::regtype rangetype
FROM  pg_partition pp, pg_partition_rule pr1
where pp.paristemplate = false and pr1.paroid=pp.oid and pp.parkind = 'r'
and pp.parrelid='app_deng.bi_of_data'::regclass

-- 查看list分区表的视图
SELECT 
    pp.parrelid::regclass table_name,
    pr1.parchildrelid::regclass child_tbl_name,
    pr1.parname as partition_name,
    pr1.parruleord as partitionposition,
    translate(pg_get_expr(pr1.parlistvalues,pr1.parchildrelid),'-'':date character varying bpchar numeric double percision timestamp without time zone','') as partitionlistvalue,
    substring(parlistvalues,'consttype ([0-9]+)')::integer::regtype listtype
FROM  pg_partition pp, pg_partition_rule pr1
where pp.paristemplate = false and pr1.paroid=pp.oid and pp.parkind = 'l'