[jira] [Created] (SPARK-28007) Caret operator (^) means bitwise XOR in Spark and exponentiation in Postgres/Redshift

["Josh Rosen (JIRA)" <ji...@apache.org>]

Josh Rosen created SPARK-28007:
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             Summary: Caret operator (^) means bitwise XOR in Spark and exponentiation in Postgres/Redshift
                 Key: SPARK-28007
                 URL: https://issues.apache.org/jira/browse/SPARK-28007
             Project: Spark
          Issue Type: Sub-task
          Components: SQL
    Affects Versions: 3.0.0
            Reporter: Josh Rosen


The expression {{expr1 ^ expr2}} has different meanings in Spark and Postgres:
 * [In Postgres|https://www.postgresql.org/docs/11/functions-math.html] and [Redshift|https://docs.aws.amazon.com/redshift/latest/dg/r_OPERATOR_SYMBOLS.html] , this returns {{expr1}} raised to the exponent {{expr2}} (additionally, the Postgres docs explicitly state that this operation is left-associative).
 * [In Spark|https://spark.apache.org/docs/2.4.3/api/sql/index.html#_14] and [Hive|https://cwiki.apache.org/confluence/display/Hive/LanguageManual+UDF#LanguageManualUDF-ArithmeticOperators], this returns the bitwise exclusive OR of {{expr1}} and {{expr2}}.

I'm reporting this under the Postgres compatibility umbrella. If we have SQL dialect support (e.g. a Postgres compatibility dialect), maybe this behavior could be flagged there?



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