gatorsmile commented on issue #23276: [SPARK-26321][SQL] Split a SQL in correct way URL: https://github.com/apache/spark/pull/23276#issuecomment-446476683 Let us first update the PR description to explain the problem we want to resolve. Regarding comments, our SQL parser follows PostgreSQL. You can read SqlBase.g4 to confirm it. ``` SIMPLE_COMMENT : '--' ~[\r\n]* '\r'? '\n'? -> channel(HIDDEN) ; BRACKETED_EMPTY_COMMENT : '/**/' -> channel(HIDDEN) ; BRACKETED_COMMENT : '/*' ~[+] .*? '*/' -> channel(HIDDEN) ; ``` In PostgreSQL doc: https://www.postgresql.org/docs/9.4/sql-syntax-lexical.html > A comment is a sequence of characters beginning with double dashes and extending to the end of the line, e.g.: ``` -- This is a standard SQL comment ``` > Alternatively, C-style block comments can be used: ``` /* multiline comment * with nesting: /* nested block comment */ */ ``` > where the comment begins with /* and extends to the matching occurrence of */. These block comments nest, as specified in the SQL standard but unlike C, so that one can comment out larger blocks of code that might contain existing block comments. > A comment is removed from the input stream before further syntax analysis and is effectively replaced by whitespace.
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