dongjoon-hyun commented on a change in pull request #27502: [SPARK-30759][SQL]
Initialize cache for foldable patterns in StringRegexExpression
URL: https://github.com/apache/spark/pull/27502#discussion_r376741391
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File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/regexpExpressions.scala
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@@ -41,10 +41,12 @@ trait StringRegexExpression extends Expression
override def dataType: DataType = BooleanType
- // try cache the pattern for Literal
+ // try cache foldable pattern
private lazy val cache: Pattern = pattern match {
- case Literal(value: String, StringType) => compile(value)
- case _ => null
+ case p: Expression if p.foldable =>
Review comment:
This will consider `'a' + 'b'` from now. I prefer to consider SPARK-30759 as
a performance improvement and merge to `master` only.
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