Sql 如何在所有行中搜索文本，而不单独指定每一列

例如

给定下表和数据，查找包含单词“on”的行（不区分大小写）

简单（但有限）的解决方案 此解决方案仅与包含“基元”类型的表相关
（无结构、数组、映射等）

---

该解决方案的问题是，所有列都没有分隔符（否，

concat_ws（*）

产生一个异常），因此边界中的单词变成单个单词，例如-

Greyhound

和

On

变成

GreyhoundOn

select  i
       ,regexp_replace(concat(*),'(?i)on','==>$0<==') as rec

from    t

where   concat(*) rlike '(?i)on'    
;

---

---

选择cast（拆分（rec，\\x01'）[0]作为int）作为i
，regexp_replace（regexp_replace（rec），（？ix）\\b on\\b'，'=>0美元
select  i
       ,regexp_replace(concat(*),'(?i)on','==>$0<==') as rec

from    t

where   concat(*) rlike '(?i)on'    
;

+---+-----------------------------------------------------------------------------------------------------------+
|   |                                                    rec                                                    |
+---+-----------------------------------------------------------------------------------------------------------+
| 1 | 12017-03-15Now we take our timeso n==>on<==chalantAnd spend our nights so b==>on<== vivant                |
| 2 | 22017-03-16Quick as a winkShe changed her mindShe stood ==>on<== the tracks                               |
| 3 | 32017-03-17But I’m talking a Greyhound==>On<== the Huds==>on<== River LineI’m in a New York state of mind |
+---+-----------------------------------------------------------------------------------------------------------+

select  i
       ,regexp_replace(concat(*),'(?ix)\\b on \\b','==>$0<==') as delim_rec

from   (select  i
               ,printf(concat('%s',repeat('|||%s',field(unhex(1),*,unhex(1))-2)),*)   as delim_rec   

        from    t
        ) t

where  delim_rec rlike '(?ix)\\b on \\b'        
;

+---+------------------------------------------------------------------------------------------------------------------+
| i |                                                    delim_rec                                                     |
+---+------------------------------------------------------------------------------------------------------------------+
| 2 | 22|||2017-03-16|||Quick as a wink|||She changed her mind|||She stood ==>on<== the tracks                         |
| 3 | 33|||2017-03-17|||But I’m talking a Greyhound|||==>On<== the Hudson River Line|||I’m in a New York state of mind |
+---+------------------------------------------------------------------------------------------------------------------+

create external table t_ext (rec string) 
row format delimited
fields terminated by '0'
location '/user/hive/warehouse/t'   
;

select  cast(split(rec,'\\x01')[0] as int)                                              as i
       ,regexp_replace(regexp_replace(rec,'(?ix)\\b on \\b','==>$0<=='),'\\x01','|||')  as rec

from    t_ext

where   rec rlike '(?ix)\\b on \\b'               
;

+---+-----------------------------------------------------------------------------------------------------------------+
| i |                                                       rec                                                       |
+---+-----------------------------------------------------------------------------------------------------------------+
| 2 | 2|||2017-03-16|||Quick as a wink|||She changed her mind|||She stood ==>on<== the tracks                         |
| 3 | 3|||2017-03-17|||But I’m talking a Greyhound|||==>On<== the Hudson River Line|||I’m in a New York state of mind |
+---+-----------------------------------------------------------------------------------------------------------------+