mihailom-db commented on code in PR #45383:
URL: https://github.com/apache/spark/pull/45383#discussion_r1546370140

@@ -0,0 +1,135 @@
+ * 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 javax.annotation.Nullable
+import scala.annotation.tailrec
+import org.apache.spark.sql.catalyst.analysis.TypeCoercion.hasStringType
+import org.apache.spark.sql.catalyst.expressions.{BinaryExpression, Cast, 
ComplexTypeMergingExpression, CreateArray, ExpectsInputTypes, Expression, 
Predicate, SortOrder}
+import org.apache.spark.sql.errors.QueryCompilationErrors
+import org.apache.spark.sql.internal.SQLConf
+import org.apache.spark.sql.types.{AbstractDataType, ArrayType, DataType, 
+object CollationTypeCasts extends TypeCoercionRule {
+  override val transform: PartialFunction[Expression, Expression] = {
+    case e if !e.childrenResolved => e
+    case sc @ (_: BinaryExpression
+              | _: Predicate
+              | _: SortOrder
+              | _: ExpectsInputTypes
+              | _: ComplexTypeMergingExpression) =>
+      val newChildren = collateToSingleType(sc.children)
+      sc.withNewChildren(newChildren)
+    case pesc @ (_: CreateArray) =>

Review Comment:
   This might be a good question for @srielau. How do we want this query to 
behave: `SELECT array('a', 'b' collate UNICODE) || ('c' collate UNICODE_CI)` 
(Concat_Ws in our implementation)? This query in Postgre fails with explicit 
type mismatch. Do we want to propagate explicit collations from elements to 
arrays. I would say yes, as ArrayType is constructed with a parameter called 
`elementType`. This suggests, if elements are explicit, then ArrayType should 
be as well. Also, on other operations with arrays, as we defined that function 
outputs are implicit, I would say array creation is then the only place where 
we should propagate this explicit meaning.

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