maropu commented on a change in pull request #25001: [SPARK-28083][SQL] Support
LIKE ... ESCAPE syntax
URL: https://github.com/apache/spark/pull/25001#discussion_r302360877
##########
File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/regexpExpressions.scala
##########
@@ -103,13 +103,16 @@ abstract class StringRegexExpression extends
BinaryExpression
Use RLIKE to match with standard regular expressions.
""",
since = "1.0.0")
-case class Like(left: Expression, right: Expression) extends
StringRegexExpression {
+case class Like(left: Expression, right: Expression, escapeCharOpt:
Option[String] = None)
+ extends StringRegexExpression {
+
+ private lazy val escapeStr = escapeCharOpt.getOrElse("\\")
- override def escape(v: String): String = StringUtils.escapeLikeRegex(v)
+ override def escape(v: String): String = StringUtils.escapeLikeRegex(v,
escapeStr)
override def matches(regex: Pattern, str: String): Boolean =
regex.matcher(str).matches()
- override def toString: String = s"$left LIKE $right"
+ override def toString: String = s"$left LIKE $right ESCAPE $escapeStr"
Review comment:
This is an optional feature, so I think its better to hide this if
escapeCharOpt = None.
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