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[SPARK-47415][SQL] Add collation support for Levenshtein expression #46788

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[SPARK-47415][SQL] Add collation support for Levenshtein expression #46788

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0c90de1
Initial commit
uros-db May 29, 2024
7b6f4f1
Merge branch 'apache:master' into levenshtein
uros-db Jun 10, 2024
11008bb
Tests
uros-db Jun 10, 2024
5d4d06a
Update CollationStringExpressionsSuite.scala
uros-db Jun 10, 2024
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4 changes: 2 additions & 2 deletions ...catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/stringExpressions.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -2240,8 +2240,8 @@ case class Levenshtein(
}

override def inputTypes: Seq[AbstractDataType] = threshold match {
case Some(_) => Seq(StringType, StringType, IntegerType)
case _ => Seq(StringType, StringType)
case Some(_) => Seq(StringTypeAnyCollation, StringTypeAnyCollation, IntegerType)
case _ => Seq(StringTypeAnyCollation, StringTypeAnyCollation)
}

override def children: Seq[Expression] = threshold match {
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22 changes: 22 additions & 0 deletions sql/core/src/test/scala/org/apache/spark/sql/CollationStringExpressionsSuite.scala
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Expand Up @@ -645,6 +645,28 @@ class CollationStringExpressionsSuite
})
}

test("Levenshtein string expression with collation") {
// Supported collations
case class LevenshteinTestCase(
left: String, right: String, collationName: String, threshold: Option[Int], result: Int
)
val testCases = Seq(
LevenshteinTestCase("kitten", "sitTing", "UTF8_BINARY", None, result = 4),
LevenshteinTestCase("kitten", "sitTing", "UTF8_BINARY_LCASE", None, result = 4),
LevenshteinTestCase("kitten", "sitTing", "UNICODE", Some(3), result = -1),
LevenshteinTestCase("kitten", "sitTing", "UNICODE_CI", Some(3), result = -1)
)
testCases.foreach(t => {
withSQLConf(SQLConf.DEFAULT_COLLATION.key -> t.collationName) {
val th = if (t.threshold.isDefined) s", ${t.threshold.get}" else ""
val query = s"select levenshtein('${t.left}', '${t.right}'$th)"
// Result & data type
checkAnswer(sql(query), Row(t.result))
assert(sql(query).schema.fields.head.dataType.sameType(IntegerType))
}
})
}

test("Support Left/Right/Substr with collation") {
case class SubstringTestCase(
method: String,
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