[Coral-Trino] Fix redundant transforms/casts from GenericProjectTrans…

…former (linkedin#512)

* fix redundant transforms/casts

* spotless

* fix fuzzyunionsqlrewriter incorrect struct type when building structs

* remove unused

* spotless

* spotless

coral-common/src/main/java/com/linkedin/coral/common/FuzzyUnionSqlRewriter.java

@@ -1,5 +1,5 @@
 /**
- * Copyright 2019-2023 LinkedIn Corporation. All rights reserved.
+ * Copyright 2019-2024 LinkedIn Corporation. All rights reserved.
  * Licensed under the BSD-2 Clause license.
  * See LICENSE in the project root for license information.
  */
@@ -237,7 +237,8 @@ private RelDataType getUnionDataType(final List<RelDataType> dataTypes) {
     if (baseDataType.isStruct()) {
       // Build the common UNION type using the first branch that appears in the query
       final RelDataTypeFactory.Builder builder =
-          new RelDataTypeFactory.Builder(toRelConverter.getRelBuilder().getTypeFactory());
+          new RelDataTypeFactory.Builder(toRelConverter.getRelBuilder().getTypeFactory())
+              .kind(baseDataType.getStructKind());
 
       // Build a set of common fields by name in the given dataTypes
       Set<String> commonFieldNames =