Github user rxin commented on a diff in the pull request:
https://github.com/apache/spark/pull/7468#discussion_r34967396
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/stringOperations.scala
---
@@ -774,6 +774,114 @@ case class Encode(value: Expression, charset:
Expression)
}
/**
+ * Replace all substrings of str that match regexp with rep.
+ *
+ * NOTE: this expression is not THREAD-SAFE, we have to create a instance
for each thread.
+ */
+case class RegExpReplace(subject: Expression, regexp: Expression, rep:
Expression)
+ extends Expression with ImplicitCastInputTypes with CodegenFallback {
--- End diff --
@chenghao-intel the reason I want codegen is not to improve performance of
this expression itself, but to prevent using fallback because once we fallback,
all the children expressions will be called without codegen and require a lot
of boxing.
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