Flink SQL string literal does not support double quotation?

Posted by 徐涛 on
URL: http://deprecated-apache-flink-user-mailing-list-archive.369.s1.nabble.com/Flink-SQL-string-literal-does-not-support-double-quotation-tp24199.html

Hi Experts,

When I am running the following SQL in FLink 1.6.2, I got org.apache.calcite.sql.parser.impl.ParseException

select 

 BUYER_ID, 

 AMOUNT, 

 concat( 

 from_unixtime(unix_timestamp(CREATE_TIME, 'EEE MMM dd HH:mm:ss zzz yyyy'),'yyyyMMdd'), 

 case when 1>= 10 and 1<= 21 

 then "02" else "01” 

 end 

 ) as date12 

 from 

 vip_order

but when I use single quotes , such as  ’02’ , it does not complain anything, it is a bit wired, because normally in SQL user can use double quotation or single quotation equally.

I want to know it is a Flink limitation or a bug? If it is a limitation, why?

Thank you.

Best 

Henry