uros-db commented on code in PR #46040: URL: https://github.com/apache/spark/pull/46040#discussion_r1565412168
########## 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) + val checks = Seq("utf8_binary_lcase", "utf8_binary", "unicode", "unicode_ci").flatMap( + c => Seq( + QTestCase("select left('abc' collate " + c + ", 1)", c, Row("a")), + QTestCase("select right('def' collate " + c + ", 1)", c, Row("f")), + QTestCase("select substr('abc' collate " + c + ", 2)", c, Row("bc")), + QTestCase("select substr('example' collate " + c + ", 0, 2)", c, Row("ex")), + QTestCase("select substr('example' collate " + c + ", 1, 2)", c, Row("ex")), + QTestCase("select substr('example' collate " + c + ", 0, 7)", c, Row("example")), + QTestCase("select substr('example' collate " + c + ", 1, 7)", c, Row("example")), + QTestCase("select substr('example' collate " + c + ", 0, 100)", c, Row("example")), + QTestCase("select substr('example' collate " + c + ", 1, 100)", c, Row("example")), + QTestCase("select substr('example' collate " + c + ", 2, 2)", c, Row("xa")), + QTestCase("select substr('example' collate " + c + ", 1, 6)", c, Row("exampl")), + QTestCase("select substr('example' collate " + c + ", 2, 100)", c, Row("xample")), + QTestCase("select substr('example' collate " + c + ", 0, 0)", c, Row("")), + QTestCase("select substr('example' collate " + c + ", 100, 4)", c, Row("")), + QTestCase("select substr('example' collate " + c + ", 0, 100)", c, Row("example")), + QTestCase("select substr('example' collate " + c + ", 1, 100)", c, Row("example")), + QTestCase("select substr('example' collate " + c + ", 2, 100)", c, Row("xample")), + QTestCase("select substr('example' collate " + c + ", -3, 2)", c, Row("pl")), + QTestCase("select substr('example' collate " + c + ", -100, 4)", c, Row("")), + QTestCase("select substr('example' collate " + c + ", -2147483648, 6)", c, Row("")), + QTestCase("select substr(' a世a ' collate " + c + ", 2, 3)", c, Row("a世a")), // scalastyle:ignore + QTestCase("select left(' a世a ' collate " + c + ", 3)", c, Row(" a世")), // scalastyle:ignore + QTestCase("select right(' a世a ' collate " + c + ", 3)", c, Row("世a ")), // scalastyle:ignore + QTestCase("select substr('AaAaAaAa000000' collate " + c + ", 2, 3)", c, Row("aAa")), + QTestCase("select left('AaAaAaAa000000' collate " + c + ", 3)", c, Row("AaA")), + QTestCase("select right('AaAaAaAa000000' collate " + c + ", 3)", c, Row("000")), + QTestCase("select substr('' collate " + c + ", 1, 1)", c, Row("")), + QTestCase("select left('' collate " + c + ", 1)", c, Row("")), + QTestCase("select right('' collate " + c + ", 1)", c, Row("")), + QTestCase("select left('ghi' collate " + c + ", 1)", c, Row("g")) Review Comment: I don't think we need this many test cases here, if you didn't modify the way Substring/Left/Right expressions behave when given collated strings (i.e. you didn't introduce any collation awareness to nullSafeEval/doCodeGen), then there should be no need to go this deep - a couple of test cases should do the trick just fine -- This is an automated message from the Apache Git Service. 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