beliefer commented on a change in pull request #32477:
URL: https://github.com/apache/spark/pull/32477#discussion_r632423582
##########
File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/util/StringUtils.scala
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@@ -66,6 +67,52 @@ object StringUtils extends Logging {
"(?s)" + out.result() // (?s) enables dotall mode, causing "." to match
new lines
}
+ /**
+ * Validate and convert SQL 'similar to' pattern to a Java regular
expression.
+ *
+ * This function is similar to escapeLikeRegex, but there are some
differences as follows:
+ * 1. If the escape character precedes the meta character for SIMILAR TO,
the meta character
+ * should convert to quote literal.
+ * 2. If '\' is not escape character, need convert to quote literal.
+ * 3. '.', '^' and '$' is not a meta character for SIMILAR TO,
+ * so we need convert it to quote literal.
+ * 4. Avoid convert the characters of Java regular expression to quote
literal.
+ * @param pattern the SQL pattern to convert
+ * @param escapeChar the escape character.
+ * @return the equivalent Java regular expression of the pattern for SIMILAR
TO
+ */
+ def escapeSimilarRegex(pattern: String, escapeChar: Char): String = {
Review comment:
escapeLikeRegex produces the_regex
escapeSimilarRegex produces ^the_regex$
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