MaxGekk commented on code in PR #49191:
URL: https://github.com/apache/spark/pull/49191#discussion_r1923230780
##########
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/stringExpressions.scala:
##########
@@ -3723,3 +3723,40 @@ case class Luhncheck(input: Expression) extends
RuntimeReplaceable with Implicit
override protected def withNewChildrenInternal(
newChildren: IndexedSeq[Expression]): Expression = copy(newChildren(0))
}
+
+/**
+ * A function that prepends a backslash to each instance of single quote
+ * in the given string and encloses the result by single quotes.
+ */
+@ExpressionDescription(
+ usage = """
+ _FUNC_(str) - Returns `str` enclosed by single quotes and
+ each instance of single quote in it is preceded by a backslash.
Review Comment:
It would be better to leave one string because the new line character occurs
in docs.
##########
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/stringExpressions.scala:
##########
@@ -3723,3 +3723,40 @@ case class Luhncheck(input: Expression) extends
RuntimeReplaceable with Implicit
override protected def withNewChildrenInternal(
newChildren: IndexedSeq[Expression]): Expression = copy(newChildren(0))
}
+
+/**
+ * A function that prepends a backslash to each instance of single quote
+ * in the given string and encloses the result by single quotes.
+ */
+@ExpressionDescription(
+ usage = """
+ _FUNC_(str) - Returns `str` enclosed by single quotes and
+ each instance of single quote in it is preceded by a backslash.
+ """,
+ examples = """
+ Examples:
+ > SELECT _FUNC_('Don\'t');
+ 'Don\'t'
+ """,
+ since = "4.0.0",
+ group = "string_funcs")
+case class Quote(input: Expression) extends RuntimeReplaceable with
ImplicitCastInputTypes
+ with UnaryLike[Expression] {
+ override def nullIntolerant: Boolean = true
+
+ override lazy val replacement: Expression = Invoke(input, "quote",
input.dataType)
Review Comment:
Can't you use `StaticInvoke`?
##########
sql/core/src/test/scala/org/apache/spark/sql/StringFunctionsSuite.scala:
##########
@@ -1452,4 +1452,21 @@ class StringFunctionsSuite extends QueryTest with
SharedSparkSession {
Seq(Row("abc", "def")))
}
}
+
+ test("SPARK-50582: string quote function") {
+ val df = Seq(("Don't")).toDF("value")
+
+ checkAnswer(
+ df.select(quote($"value")),
+ Row("'Don\\'t'"))
+
+ checkAnswer(
+ df.selectExpr("quote('Spark')"),
+ Row("'Spark'")
+ )
+
+ checkAnswer(
+ df.selectExpr("quote(NULL)"),
+ Row(null))
Review Comment:
This is duplicates of checks in `string-functions.sql`?
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