kanha-gupta commented on PR #24970:
URL: https://github.com/apache/shardingsphere/pull/24970#issuecomment-1501060512

   @strongduanmu Thanks a lot for guidance.
   select_substring task is done.  2 more doubts :
   1- for select_trim, There is a symbol BOTH which needs to parsed, I tried 
doing it using Expression segment & also LiteralExpressionSegment but it is 
being Parsed as String instead of Symbol therefore it results in "BOTH" instead 
of BOTH.
   2 - for select_extract, YEAR is a function & Extracting only FunctionName 
leads to Errors & parsing it as a function leads to parenthesis ( YEAR() )
   I request you to please provide your guidance regarding this Because rest of 
the 5 special function tasks have these type of parsing.
   Thank you 
   


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