HyukjinKwon commented on code in PR #38192:
URL: https://github.com/apache/spark/pull/38192#discussion_r995357356


##########
connector/connect/src/main/scala/org/apache/spark/sql/connect/dsl/package.scala:
##########
@@ -34,59 +36,109 @@ package object dsl {
       val identifier = CatalystSqlParser.parseMultipartIdentifier(s)
 
       def protoAttr: proto.Expression =
-        proto.Expression.newBuilder()
+        proto.Expression
+          .newBuilder()
           .setUnresolvedAttribute(
-            proto.Expression.UnresolvedAttribute.newBuilder()
+            proto.Expression.UnresolvedAttribute
+              .newBuilder()
               .addAllParts(identifier.asJava)
               .build())
           .build()
     }
 
     implicit class DslExpression(val expr: proto.Expression) {
-      def as(alias: String): proto.Expression = 
proto.Expression.newBuilder().setAlias(
-        
proto.Expression.Alias.newBuilder().setName(alias).setExpr(expr)).build()
-
-      def < (other: proto.Expression): proto.Expression =
-        proto.Expression.newBuilder().setUnresolvedFunction(
-          proto.Expression.UnresolvedFunction.newBuilder()
-            .addParts("<")
-            .addArguments(expr)
-            .addArguments(other)
-        ).build()
+      def as(alias: String): proto.Expression = proto.Expression

Review Comment:
   qq is this just a style change? Maybe it's better to exclude these unrelated 
changes.



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