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https://issues.apache.org/jira/browse/SPARK-29737?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16985714#comment-16985714
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Xiao Li commented on SPARK-29737:
---------------------------------
We do not need to change the Spark behavior, although it is different from pgSQL
> Concat for array in Spark SQL is not the one in PostgreSQL but array_cat
> ------------------------------------------------------------------------
>
> Key: SPARK-29737
> URL: https://issues.apache.org/jira/browse/SPARK-29737
> Project: Spark
> Issue Type: Sub-task
> Components: SQL
> Affects Versions: 3.0.0
> Reporter: Kent Yao
> Priority: Major
>
> {code:sql}
> postgres=# select array_cat(array[1,2], array[2]);
> array_cat
> -----------
> {1,2,2}
> (1 row)
> postgres=# select concat(array[1,2], array[2]);
> concat
> ----------
> {1,2}{2}
> (1 row)
> {code}
> {code:sql}
> // Some comments here
> spark-sql> select concat(array(1,2), array(2));
> [1,2,2]
> {code}
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