Github user viirya commented on a diff in the pull request:
https://github.com/apache/spark/pull/7561#discussion_r35077566
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/stringOperations.scala
---
@@ -187,6 +187,64 @@ case class Like(left: Expression, right: Expression)
override def matches(regex: Pattern, str: String): Boolean =
regex.matcher(str).matches()
override def toString: String = s"$left LIKE $right"
+
+ override protected def genCode(ctx: CodeGenContext, ev:
GeneratedExpressionCode): String = {
+ val patternClass = classOf[Pattern].getName
+
+ val literalRight: String = right match {
+ case x @ Literal(value: String, StringType) => escape(value)
+ case _ => null
+ }
+
+ val leftGen = left.gen(ctx)
+ val rightGen = right.gen(ctx)
+
+ val patternCode =
+ if (literalRight != null) {
+ s"${patternClass} pattern = $patternClass.compile($literalRight);"
+ } else {
+ s"""
+ StringBuilder regex = new StringBuilder("(?s)");
+ for (int idx = 1; idx < rightStr.length(); idx++) {
+ char prev = rightStr.charAt(idx - 1);
+ char curr = rightStr.charAt(idx);
+ if (prev == '\\\\') {
+ if (curr == '_') {
+ regex.append("_");
+ } else if (curr == '%') {
+ regex.append("%");
+ } else {
+ regex.append(${patternClass}.quote("\\\\" + curr));
+ }
+ } else {
+ if (curr != '\\\\') {
+ if (curr == '_') {
+ regex.append(".");
+ } else if (curr == '%') {
+ regex.append(".*");
+ } else {
+ regex.append(${patternClass}.quote((new
Character(curr)).toString()));
+ }
+ }
+ }
+ }
+ ${patternClass} pattern =
${patternClass}.compile(regex.toString());
+ """
+ }
--- End diff --
I am not sure I get your point. I think we don't want to call `escape` in
the generated java codes?
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