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https://issues.apache.org/jira/browse/SPARK-28880?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17029752#comment-17029752
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jiaan.geng commented on SPARK-28880:
------------------------------------
[~lixiao]
> ANSI SQL: Bracketed comments
> ----------------------------
>
> Key: SPARK-28880
> URL: https://issues.apache.org/jira/browse/SPARK-28880
> Project: Spark
> Issue Type: Sub-task
> Components: SQL
> Affects Versions: 3.0.0
> Reporter: Yuming Wang
> Priority: Major
>
> We can not support these bracketed comments:
> *Case 1*:
> {code:sql}
> /* This is an example of SQL which should not execute:
> * select 'multi-line';
> */
> {code}
> *Case 2*:
> {code:sql}
> /*
> SELECT 'trailing' as x1; -- inside block comment
> */
> {code}
> *Case 3*:
> {code:sql}
> /* This block comment surrounds a query which itself has a block comment...
> SELECT /* embedded single line */ 'embedded' AS x2;
> */
> {code}
> *Case 4*:
> {code:sql}
> SELECT -- continued after the following block comments...
> /* Deeply nested comment.
> This includes a single apostrophe to make sure we aren't decoding this
> part as a string.
> SELECT 'deep nest' AS n1;
> /* Second level of nesting...
> SELECT 'deeper nest' as n2;
> /* Third level of nesting...
> SELECT 'deepest nest' as n3;
> */
> Hoo boy. Still two deep...
> */
> Now just one deep...
> */
> 'deeply nested example' AS sixth;
> {code}
> *bracketed comments*
> Bracketed comments are introduced by /* and end with */.
> [https://www.ibm.com/support/knowledgecenter/en/SSCJDQ/com.ibm.swg.im.dashdb.sql.ref.doc/doc/c0056402.html]
> [https://www.postgresql.org/docs/11/sql-syntax-lexical.html#SQL-SYNTAX-COMMENTS]
> Feature ID: T351
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