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Posted to user@flink.apache.org by Xingcan Cui <xi...@gmail.com> on 2018/11/01 11:59:20 UTC

Re: Flink SQL string literal does not support double quotation?

Hi Henry,

In most SQL conventions, single quotes are for Strings, while double quotes are for identifiers.

Best,
Xingcan

> On Oct 31, 2018, at 7:53 PM, 徐涛 <ha...@gmail.com> wrote:
> 
> 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