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https://issues.apache.org/jira/browse/SPARK-42746?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17892830#comment-17892830
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Mikhail Nikoliukin commented on SPARK-42746:
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I will try to complete this ticket
> Add the LISTAGG() aggregate function
> ------------------------------------
>
> Key: SPARK-42746
> URL: https://issues.apache.org/jira/browse/SPARK-42746
> Project: Spark
> Issue Type: New Feature
> Components: SQL
> Affects Versions: 3.4.0
> Reporter: Max Gekk
> Assignee: Apache Spark
> Priority: Major
> Labels: pull-request-available
>
> {{listagg()}} is a common and useful aggregation function to concatenate
> string values in a column, optionally by a certain order. The systems below
> have supported such function already:
> * Oracle:
> [https://docs.oracle.com/cd/E11882_01/server.112/e41084/functions089.htm#SQLRF30030]
> * Snowflake: [https://docs.snowflake.com/en/sql-reference/functions/listagg]
> * Amazon Redshift:
> [https://docs.aws.amazon.com/redshift/latest/dg/r_LISTAGG.html]
> * Google BigQuery:
> [https://cloud.google.com/bigquery/docs/reference/standard-sql/functions-and-operators#string_agg]
> Need to introduce this new aggregate in Spark, both as a regular aggregate
> and as a window function.
> Proposed syntax:
> {code:sql}
> LISTAGG( [ DISTINCT ] <expr> [, <delimiter> ] ) [ WITHIN GROUP (
> <orderby_clause> ) ]
> {code}
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