wangyum opened a new pull request #24852: [SPARK-28027][SQL] Add bitwise shift 
left/right operators
URL: https://github.com/apache/spark/pull/24852
 
 
   ## What changes were proposed in this pull request?
   
   This pr add bitwise shift left/right operators:
   
   Operator | Description | Example | Result
   -- | -- | -- | --
   << | bitwise shift left | 1 << 4 | 16
   \>\> | bitwise shift right | 8 >> 2 | 2
   
   
   PostgreSQL, Vertica, Redshift and MySQL support these operators:
   https://www.postgresql.org/docs/11/functions-math.html
   
https://www.vertica.com/docs/9.2.x/HTML/Content/Authoring/SQLReferenceManual/LanguageElements/Operators/BitwiseOperators.htm
   https://docs.aws.amazon.com/redshift/latest/dg/r_OPERATOR_SYMBOLS.html
   https://dev.mysql.com/doc/refman/5.7/en/bit-functions.html
   
   ## How was this patch tested?
   
   unit tests
   

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