Maxim Gekk created SPARK-30759:
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Summary: The cache in StringRegexExpression is not initialized for
foldable patterns
Key: SPARK-30759
URL: https://issues.apache.org/jira/browse/SPARK-30759
Project: Spark
Issue Type: Bug
Components: SQL
Affects Versions: 2.4.5, 3.0.0
Reporter: Maxim Gekk
Attachments: Screen Shot 2020-02-08 at 22.45.50.png
In the case of foldable patterns, the cache in StringRegexExpression should be
evaluated once but in fact it is compiled every time. Here is the example:
{code:sql}
SELECT '%SystemDrive%\Users\John' _FUNC_ '%SystemDrive%\\Users.*';
{code}
the code
https://github.com/apache/spark/blob/8aebc80e0e67bcb1aa300b8c8b1a209159237632/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/regexpExpressions.scala#L45-L48:
{code:scala}
// try cache the pattern for Literal
private lazy val cache: Pattern = pattern match {
case Literal(value: String, StringType) => compile(value)
case _ => null
}
{code}
The attached screenshot shows that foldable expression doesn't fall to the
first case.
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