uros-db commented on code in PR #46040:
URL: https://github.com/apache/spark/pull/46040#discussion_r1565372366
##########
sql/core/src/test/scala/org/apache/spark/sql/CollationStringExpressionsSuite.scala:
##########
@@ -163,6 +163,169 @@ class CollationStringExpressionsSuite
})
}
+ test("substring check output type on explicitly collated string") {
+ case class SubstringTestCase[R](args: Seq[String], collation: String,
result: R)
+ val checks = Seq(
+ SubstringTestCase(Seq("Spark", "2"), "UTF8_BINARY", "park"),
+ SubstringTestCase(Seq("Spark", "2"), "UTF8_BINARY_LCASE", "park")
+ )
+ checks.foreach(ct => {
+ val query = s"SELECT substr(collate('${ct.args.head}',
'${ct.collation}')," +
+ s" ${ct.args.tail.head})"
+ // Result & data type
+ checkAnswer(sql(query), Row(ct.result))
+
assert(sql(query).schema.fields.head.dataType.sameType(StringType(ct.collation)))
+ })
+ }
+
+ test("left/right/substr on implicitly collated string returns proper value
and type") {
+ case class QTestCase(query: String, collation: String, result: Row)
+ val longString = "In the course of human events"
+ val checks = Seq("utf8_binary_lcase", "utf8_binary", "unicode",
"unicode_ci").flatMap(
+ c => Seq(
+ QTestCase(s"select left(left('$longString' collate " + c + ", 5), 1)",
c, Row("I")),
+ QTestCase(s"select right(right('$longString' collate " + c + ", 5),
1)", c, Row("s")),
+ QTestCase(
+ s"select substr(substr('$longString' collate " + c + ", 4), 2)", c,
+ Row("he course of human events"))
+ )
+ )
+
+ checks.foreach { check =>
+ // Result & data type
+ checkAnswer(sql(check.query), check.result)
+
assert(sql(check.query).schema.fields.head.dataType.sameType(StringType(check.collation)))
+ }
+ }
+
+ test("left/right/substr on explicitly collated proper string returns proper
value and type") {
+ case class QTestCase(query: String, collation: String, result: Row)
Review Comment:
Instead of QTestCase, let's use meaningful names such as `SubstringTestCase`
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