Spark SQL support these bracketed comments:
/* This is an example of SQL which should not execute:
* select 'multi-line';
SELECT 'trailing' as x1; */
But Spark SQL not support nested bracketed comments show below:
/* This block comment surrounds a query which itself has a block comment...
SELECT /* embedded single line */ 'embedded' AS x2;
SELECT /* 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;
Bracketed comments are introduced by /* and end with */.
Feature ID: T351