[jira] [Created] (SPARK-28783) Support plus + operator as concatenation for StringType columns in pyspark

["Louis Yang (Jira)" <ji...@apache.org>]

Louis Yang created SPARK-28783:
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             Summary: Support plus + operator as concatenation for StringType columns in pyspark
                 Key: SPARK-28783
                 URL: https://issues.apache.org/jira/browse/SPARK-28783
             Project: Spark
          Issue Type: Wish
          Components: PySpark
    Affects Versions: 2.4.3
            Reporter: Louis Yang


Right now if one try to use plus operator for two columns in pyspark like `F.col('a') + F.col('b')`, pyspark always try to treat it as arithmetic addition like `2+3=5`. If the columns are `StringType`, pyspark try to convert them to number then do the addition. However, in python and pandas world, the plus operation for string type means concatenation not arithmetic addition. So it will be great that pyspark also support the same logic that `F.col('str1') + F.col('str2') + F.col('str3')` yields `F.concat(F.col('str1'), F.col('str2'), F.col('str3'))`.



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