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https://issues.apache.org/jira/browse/SPARK-38334?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17694868#comment-17694868
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Gengliang Wang commented on SPARK-38334:
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[~dtenedor] Shall we write docs under
https://spark.apache.org/docs/latest/sql-ref.html?
> Implement support for DEFAULT values for columns in tables
> -----------------------------------------------------------
>
> Key: SPARK-38334
> URL: https://issues.apache.org/jira/browse/SPARK-38334
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 3.4.0
> Reporter: Daniel
> Assignee: Daniel
> Priority: Major
> Labels: releasenotes
> Fix For: 3.4.0
>
>
> This story tracks the implementation of DEFAULT values for columns in tables.
> CREATE TABLE and ALTER TABLE invocations will support setting column default
> values for future operations. Following INSERT, UPDATE, MERGE statements may
> then reference the value using the DEFAULT keyword as needed.
> Examples:
> {code:sql}
> CREATE TABLE T(a INT, b INT NOT NULL);
> -- The default default is NULL
> INSERT INTO T VALUES (DEFAULT, 0);
> INSERT INTO T(b) VALUES (1);
> SELECT * FROM T;
> (NULL, 0)
> (NULL, 1)
> -- Adding a default to a table with rows, sets the values for the
> -- existing rows (exist default) and new rows (current default).
> ALTER TABLE T ADD COLUMN c INT DEFAULT 5;
> INSERT INTO T VALUES (1, 2, DEFAULT);
> SELECT * FROM T;
> (NULL, 0, 5)
> (NULL, 1, 5)
> (1, 2, 5) {code}
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