Max Gekk created SPARK-42746:
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Summary: 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
{{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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