uros-db commented on code in PR #45216:
URL: https://github.com/apache/spark/pull/45216#discussion_r1505450164


##########
common/unsafe/src/main/java/org/apache/spark/unsafe/types/UTF8String.java:
##########
@@ -341,6 +342,21 @@ public boolean contains(final UTF8String substring) {
     return false;
   }
 
+  public boolean contains(final UTF8String substring, int collationId) throws 
SparkException {
+    if (CollationFactory.fetchCollation(collationId).isBinaryCollation) {
+      return this.containsBinary(substring);
+    }
+    if (collationId == CollationFactory.LOWERCASE_COLLATION_ID) {
+      return this.toLowerCase().containsBinary(substring.toLowerCase());
+    }
+    // TODO: enable ICU collation support for "contains"
+    Map<String, String> params = new HashMap<>();
+    params.put("functionName", 
Thread.currentThread().getStackTrace()[1].getMethodName());
+    params.put("collationName", 
CollationFactory.fetchCollation(collationId).collationName);
+    throw new SparkException("COLLATION_NOT_SUPPORTED_FOR_FUNCTION",

Review Comment:
   yes, will implement "contains" for non-binary collations in a future PR



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