[jira] [Created] (SPARK-25638) Convert structs to CSV strings

["Maxim Gekk (JIRA)" <ji...@apache.org>]

Maxim Gekk created SPARK-25638:
----------------------------------

             Summary: Convert structs to CSV strings
                 Key: SPARK-25638
                 URL: https://issues.apache.org/jira/browse/SPARK-25638
             Project: Spark
          Issue Type: Improvement
          Components: SQL
    Affects Versions: 2.4.0
            Reporter: Maxim Gekk


New function to_csv() should convert a column of StructType to a column with CSV string. The function should accept the CSV options as CSV data source does. API should expose the following methods:
{code:scala}
def to_csv(e: Column, options: Map[String, String]): Column
{code}
and for Python/R:
{code:scala}
def to_csv(e: Column, options: java.util.Map[String, String]): Column
{code}

Here is an example of usage:
{code:sql}
select to_csv(named_struct('time', to_timestamp('2015-08-26', 'yyyy-MM-dd')), map('timestampFormat', 'dd/MM/yyyy'));
{code}
{code}
26/08/2015
{code}



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