uros-db commented on code in PR #46040:
URL: https://github.com/apache/spark/pull/46040#discussion_r1565610737
##########
sql/core/src/test/scala/org/apache/spark/sql/CollationStringExpressionsSuite.scala:
##########
@@ -163,6 +163,155 @@ class CollationStringExpressionsSuite
})
}
+ test("Support Left/Right/Substr with implicit collation") {
+ case class SubstringTestCase(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(
+ SubstringTestCase(s"select left(left('$longString' collate " + c + ",
5), 1)", c, Row("I")),
+ SubstringTestCase(
+ s"select right(right('$longString' collate " + c + ", 5), 1)", c,
Row("s")),
+ SubstringTestCase(
+ 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("Support Left/Right/Substr with explicit proper collation") {
+ case class SubstringTestCase(query: String, collation: String, result: Row)
+ val checks = Seq("utf8_binary_lcase", "utf8_binary", "unicode",
"unicode_ci").flatMap(
+ c => Seq(
+ SubstringTestCase("select left('abc' collate " + c + ", 1)", c,
Row("a")),
+ SubstringTestCase("select right('def' collate " + c + ", 1)", c,
Row("f")),
+ SubstringTestCase("select substr('abc' collate " + c + ", 2)", c,
Row("bc")),
+ SubstringTestCase("select substr('example' collate " + c + ", 0, 2)",
c, Row("ex")),
+ SubstringTestCase("select substr('example' collate " + c + ", 1, 2)",
c, Row("ex")),
+ SubstringTestCase("select substr('example' collate " + c + ", 0, 7)",
c, Row("example")),
+ SubstringTestCase("select substr('example' collate " + c + ", 1, 7)",
c, Row("example")),
+ SubstringTestCase("select substr('example' collate " + c + ", 0,
100)", c, Row("example")),
+ SubstringTestCase("select substr('example' collate " + c + ", 1,
100)", c, Row("example")),
+ SubstringTestCase("select substr('example' collate " + c + ", 2, 2)",
c, Row("xa")),
+ SubstringTestCase("select substr('example' collate " + c + ", 1, 6)",
c, Row("exampl")),
+ SubstringTestCase("select substr('example' collate " + c + ", 2,
100)", c, Row("xample")),
+ SubstringTestCase("select substr('example' collate " + c + ", 0, 0)",
c, Row("")),
+ SubstringTestCase("select substr('example' collate " + c + ", 100,
4)", c, Row("")),
+ SubstringTestCase("select substr('example' collate " + c + ", 0,
100)", c, Row("example")),
+ SubstringTestCase("select substr('example' collate " + c + ", 1,
100)", c, Row("example")),
+ SubstringTestCase("select substr('example' collate " + c + ", 2,
100)", c, Row("xample")),
+ SubstringTestCase("select substr('example' collate " + c + ", -3, 2)",
c, Row("pl")),
+ SubstringTestCase("select substr('example' collate " + c + ", -100,
4)", c, Row("")),
+ SubstringTestCase("select substr('example' collate " + c + ",
-2147483648, 6)", c, Row("")),
+ SubstringTestCase("select substr(' a世a ' collate " + c + ", 2, 3)", c,
Row("a世a")), // scalastyle:ignore
+ SubstringTestCase("select left(' a世a ' collate " + c + ", 3)", c,
Row(" a世")), // scalastyle:ignore
+ SubstringTestCase("select right(' a世a ' collate " + c + ", 3)", c,
Row("世a ")), // scalastyle:ignore
+ SubstringTestCase("select substr('AaAaAaAa000000' collate " + c + ",
2, 3)", c, Row("aAa")),
+ SubstringTestCase("select left('AaAaAaAa000000' collate " + c + ",
3)", c, Row("AaA")),
+ SubstringTestCase("select right('AaAaAaAa000000' collate " + c + ",
3)", c, Row("000")),
+ SubstringTestCase("select substr('' collate " + c + ", 1, 1)", c,
Row("")),
+ SubstringTestCase("select left('' collate " + c + ", 1)", c, Row("")),
+ SubstringTestCase("select right('' collate " + c + ", 1)", c, Row("")),
+ SubstringTestCase("select left('ghi' collate " + c + ", 1)", c,
Row("g"))
+ )
+ )
+
+ 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("Support Left/Right/Substr with explicit improper collation") {
+ case class SubstringTestCase(query: String, collation: String, result: Row)
+ val checks = Seq("utf8_binary_lcase", "utf8_binary", "unicode",
"unicode_ci").flatMap(
+ c => Seq(
+ SubstringTestCase("select left(null collate " + c + ", 1)", c,
Row(null)),
+ SubstringTestCase("select right(null collate " + c + ", 1)", c,
Row(null)),
+ SubstringTestCase("select substr(null collate " + c + ", 1)", c,
Row(null)),
+ SubstringTestCase("select substr(null collate " + c + ", 1, 1)", c,
Row(null)),
+ SubstringTestCase("select left('' collate " + c + ", null)", c,
Row(null)),
+ SubstringTestCase("select right('' collate " + c + ", null)", c,
Row(null)),
+ SubstringTestCase("select substr('' collate " + c + ", null)", c,
Row(null)),
+ SubstringTestCase("select substr('' collate " + c + ", null, null)",
c, Row(null))
+ )
+ )
+ 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("Support Left/Right/Substr with explicit improper length & position") {
+ case class SubstringTestCase(query: String, collation: String, result: Row)
+ val checks = Seq("utf8_binary_lcase", "utf8_binary", "unicode",
"unicode_ci").flatMap(
+ c => Seq(
+ SubstringTestCase("select left(' a世a ' collate " + c + ", '3')", c,
Row(" a世")), // scalastyle:ignore
+ SubstringTestCase("select right(' a世a ' collate " + c + ", '3')", c,
Row("世a ")), // scalastyle:ignore
+ SubstringTestCase("select right('' collate " + c + ", null)", c,
Row(null)),
+ SubstringTestCase("select substr('' collate " + c + ", null)", c,
Row(null)),
+ SubstringTestCase("select substr('' collate " + c + ", null, null)",
c, Row(null)),
+ SubstringTestCase("select left('' collate " + c + ", null)", c,
Row(null))
+ )
+ )
+ 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("Support Left/Right/Substr with session collation") {
+ case class SubstringTestCase(query: String, collation: String, result: Row)
+ val checks = Seq("utf8_binary_lcase", "utf8_binary", "unicode",
"unicode_ci")
+ .flatMap { c =>
+ Seq(
+ SubstringTestCase("select left('abc', 1)", c, Row("a")),
+ SubstringTestCase("select right('def', 1)", c, Row("f")),
+ SubstringTestCase("select substr('ghi', 1)", c, Row("ghi"))
+ )
+ }
+ checks.foreach(check => {
+ withSQLConf(SqlApiConf.DEFAULT_COLLATION -> check.collation) {
+ // Result & data type
+ checkAnswer(sql(check.query), check.result)
+
assert(sql(check.query).schema.fields.head.dataType.sameType(StringType(check.collation)))
+ }
+ })
+ }
Review Comment:
I think this test is not needed
it's good that you verified that this works, but I think session default
collation is a separate effort
we shouldn't need to test whether every single string expression works with
DEFAULT_COLLATION, because there's nothing specific about them
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