beliefer commented on a change in pull request #25001: [SPARK-28083][SQL]
Support LIKE ... ESCAPE syntax
URL: https://github.com/apache/spark/pull/25001#discussion_r354125673
##########
File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/regexpExpressions.scala
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@@ -83,16 +83,15 @@ abstract class StringRegexExpression extends
BinaryExpression
% matches zero or more characters in the input (similar to .* in
posix regular
expressions)
- The escape character is '\'. If an escape character precedes a
special symbol or another
- escape character, the following character is matched literally. It
is invalid to escape
- any other character.
-
Since Spark 2.0, string literals are unescaped in our SQL parser.
For example, in order
to match "\abc", the pattern should be "\\abc".
When SQL config 'spark.sql.parser.escapedStringLiterals' is enabled,
it fallbacks
to Spark 1.6 behavior regarding string literal parsing. For example,
if the config is
enabled, the pattern to match "\abc" should be "\abc".
+ * escape - an optional string added since Spark 3.0. The default escape
character is the '\'.
Review comment:
OK
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