beliefer commented on a change in pull request #27495: [SPARK-28880][SQL]
Support ANSI nested bracketed comments
URL: https://github.com/apache/spark/pull/27495#discussion_r379483835
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File path:
sql/catalyst/src/main/antlr4/org/apache/spark/sql/catalyst/parser/SqlBase.g4
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@@ -1800,8 +1800,23 @@ BRACKETED_EMPTY_COMMENT
: '/**/' -> channel(HIDDEN)
;
+// The bracketed comment consists of six main parts, from left to right are:
+// "/*", ~[+], left part, nested bracketed comment, right part, "*/".
+// Ⅰ. '/*' is used to match the beginning of a bracketed comment.
Review comment:
OK
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