Oushu HAWQ++ 2.2.0版本比Oushu HAWQ++ 2.1.1版本有如下新特性增强：


在csv和text文件格式中增加了对非ASCII字符串或长度大于1的字符串作为分隔符的支持(2.1.1中只能支持单个ASCII字符作为分隔符)。涉及copy语句和create external语句。

关键Bug fixes


多字符分隔符支持示例建表与查询

create writable external table exttable_option_multibytesDelimiter_w0(p varchar, q varchar) location ('hdfs://localhost:8020/hawq_default/exttable_option_multibytesDelimiter_w0.csv') format 'csv' (delimiter '^_^' escape '&' null 'NULL') encoding 'gbk';insert into exttable_option_multibytesDelimiter_w0 values('&','&');insert into exttable_option_multibytesDelimiter_w0 values('分隔符','^_^');insert into exttable_option_multibytesDelimiter_w0 values('&分隔符','&^_^');insert into exttable_option_multibytesDelimiter_w0 values('中','国');insert into exttable_option_multibytesDelimiter_w0 values('chi','na');select * from exttable_option_multibytesDelimiter_w0; p | q----------+------ & | & 分隔符 | ^_^ &分隔符 | &^_^ 中 | 国 chi | na(5 rows)生成的csv文件内容

&^_^&分隔符^_^"^_^"&分隔符^_^"&&^_^"中^_^国chi^_^na非ASCII分隔符支持示例建表与查询

create writable external table exttable_option_multibytesDelimiter_w0(p varchar, q varchar) location ('hdfs://localhost:8020/hawq_default/exttable_option_multibytesDelimiter_w0.csv') format 'csv' (delimiter '分隔符' escape '&' null 'NULL') encoding 'gbk';insert into exttable_option_multibytesDelimiter_w0 values('&','&');insert into exttable_option_multibytesDelimiter_w0 values('分隔符','^_^');insert into exttable_option_multibytesDelimiter_w0 values('&分隔符','&^_^');insert into exttable_option_multibytesDelimiter_w0 values('中','国');insert into exttable_option_multibytesDelimiter_w0 values('chi','na');select * from exttable_option_multibytesDelimiter_w0; p | q---------+------ & | & 分隔符 | ^_^ &分隔符 | &^_^ 中 | 国 chi | na(5 rows)对应的csv文件内容

&分隔符&"分隔符"分隔符^_^"&&分隔符"分隔符&^_^中分隔符国chi分隔符na