uros-db commented on code in PR #46599:
URL: https://github.com/apache/spark/pull/46599#discussion_r1604444330

@@ -0,0 +1,62 @@
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.spark.sql.catalyst.analysis
+import org.apache.spark.sql.catalyst.expressions.{AttributeReference, 
CollationKey, EqualNullSafe, EqualTo, Lower}
+import org.apache.spark.sql.catalyst.plans.logical.{Join, LogicalPlan}
+import org.apache.spark.sql.catalyst.rules.Rule
+import org.apache.spark.sql.catalyst.util.CollationFactory
+import org.apache.spark.sql.types.StringType
+object RewriteCollationJoin extends Rule[LogicalPlan] {
+  def apply(plan: LogicalPlan): LogicalPlan = plan transformUpWithNewOutput {
+    case j @ Join(_, _, _, Some(condition), _) =>
+      val newCondition = condition transform {
+        case EqualTo(l: AttributeReference, r: AttributeReference) =>
+          (l.dataType, r.dataType) match {
+            case (st: StringType, _: StringType) =>

Review Comment:
   additional note for reviewers: for now, complex structures like that will 
_not_ pass the `hashJoinSupported` check, so there's no breaking changes or 
unexpected behaviour with changes introduced in this PR

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