xuanyuanking opened a new pull request #26584: [SPARK-29951][SQL] Make the 
behavior of Postgre dialect independent of ansi mode config
URL: https://github.com/apache/spark/pull/26584
 
 
   ### What changes were proposed in this pull request?
   Fix the inconsistent behavior of build-in function SQL LEFT/RIGHT.
   
   ### Why are the changes needed?
   As the comment in 
https://github.com/apache/spark/pull/26497#discussion_r345708065, Postgre 
dialect should not be affected by the ANSI mode config.
   During reran the existing tests, only the LEFT/RIGHT build-in SQL function 
break the assumption, we fix this by following 
https://www.postgresql.org/docs/12/sql-keywords-appendix.html: LEFT/RIGHT 
reserved (can be function or type)
   
   
   ### Does this PR introduce any user-facing change?
   Yes, the Postgre dialect will not be affected by the ANSI mode config.
   
   
   ### How was this patch tested?
   Existing UT.

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