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https://issues.apache.org/jira/browse/SPARK-39107?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17555111#comment-17555111
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Thomas Graves commented on SPARK-39107:
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[~srowen] I think this actually went into 3.1.4, not 3.1.3, could you
confirm before I update Fixed versions?
> Silent change in regexp_replace's handling of empty strings
> -----------------------------------------------------------
>
> Key: SPARK-39107
> URL: https://issues.apache.org/jira/browse/SPARK-39107
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 3.1.2
> Reporter: Willi Raschkowski
> Assignee: Lorenzo Martini
> Priority: Major
> Labels: correctness, release-notes
> Fix For: 3.1.3, 3.3.0, 3.2.2
>
>
> Hi, we just upgraded from 3.0.2 to 3.1.2 and noticed a silent behavior change
> that a) seems incorrect, and b) is undocumented in the [migration
> guide|https://spark.apache.org/docs/latest/sql-migration-guide.html]:
> {code:title=3.0.2}
> scala> val df = spark.sql("SELECT '' AS col")
> df: org.apache.spark.sql.DataFrame = [col: string]
> scala> df.withColumn("replaced", regexp_replace(col("col"), "^$",
> "<empty>")).show
> +---+--------+
> |col|replaced|
> +---+--------+
> | | <empty>|
> +---+--------+
> {code}
> {code:title=3.1.2}
> scala> val df = spark.sql("SELECT '' AS col")
> df: org.apache.spark.sql.DataFrame = [col: string]
> scala> df.withColumn("replaced", regexp_replace(col("col"), "^$",
> "<empty>")).show
> +---+--------+
> |col|replaced|
> +---+--------+
> | | |
> +---+--------+
> {code}
> Note, the regular expression {{^$}} should match the empty string, but
> doesn't in version 3.1. E.g. this is the Java behavior:
> {code}
> scala> "".replaceAll("^$", "<empty>");
> res1: String = <empty>
> {code}
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