stefankandic commented on code in PR #45725:
URL: https://github.com/apache/spark/pull/45725#discussion_r1544730418
##########
sql/core/src/test/scala/org/apache/spark/sql/CollationStringExpressionsSuite.scala:
##########
@@ -73,6 +73,84 @@ class CollationStringExpressionsSuite extends QueryTest
})
}
+ test("SUBSTRING_INDEX check result on explicitly collated strings") {
+ def testSubstringIndex(str: String, delim: String, cnt: Integer,
+ collationId: Integer, expected: String): Unit = {
+ val string = Literal.create(str, StringType(collationId))
+ val delimiter = Literal.create(delim, StringType(collationId))
+ val count = Literal(cnt)
+
+ checkEvaluation(SubstringIndex(string, delimiter, count), expected)
+ }
+
+ testSubstringIndex("wwwgapachegorg", "g", -3, 0, "apachegorg")
+ testSubstringIndex("www||apache||org", "||", 2, 0, "www||apache")
+ // UTF8_BINARY_LCASE
Review Comment:
instead of separating these blocks with comments describing the collation
used how about using a variable denoting the current collation
```
var collationId = CollationFactory.nameToId("UTF8_BINARY")
testcases ...
collationId = CollationFactory.nameToId("UNICODE")
testcases ...
```
this way we won't have to litter the code with [magic
constants](https://en.wikipedia.org/wiki/Magic_number_(programming)) which
should make it more readable
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