Aleksei Akhundov created SPARK-59536:
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             Summary: Parse hint-shaped comments nested in bracketed comments
                 Key: SPARK-59536
                 URL: https://issues.apache.org/jira/browse/SPARK-59536
             Project: Spark
          Issue Type: Bug
          Components: SQL
    Affects Versions: 3.0.0
            Reporter: Aleksei Akhundov


Spark SQL fails to parse a valid nested bracketed comment when an inner comment 
starts with the SQL hint prefix {{{}/*+{}}}.

Reproducer:

{{SELECT /* outer /*+ inner */ outer tail */ 1 AS col1}}

Expected behavior:

{{SELECT 1 AS col1}}

Actual behavior: the nested {{/*+ inner */}} comment is parsed as a SQL hint, 
causing the remaining outer comment text to be parsed as SQL and the query to 
fail



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