[SPARK-28880] ANSI SQL: Nested bracketed comments - ASF JIRA

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Details

Type: Sub-task
Status: Resolved
Priority: Major
Resolution: Fixed
Affects Version/s: 3.0.0
Fix Version/s: 3.1.0
Component/s: SQL
Labels:
None

Description

Spark SQL support these bracketed comments:
Case 1:

/* This is an example of SQL which should not execute:
 * select 'multi-line';
 */

Case 2:

/*
SELECT 'trailing' as x1; -- inside block comment
*/

But Spark SQL not support nested bracketed comments show below:

Case 3:

/* This block comment surrounds a query which itself has a block comment...
SELECT /* embedded single line */ 'embedded' AS x2;
*/

Case 4:

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;