aokolnychyi commented on a change in pull request #1473:
URL: https://github.com/apache/iceberg/pull/1473#discussion_r491044238



##########
File path: 
spark3-extensions/src/main/scala/org/apache/spark/sql/catalyst/analysis/ResolveIcebergProcedures.scala
##########
@@ -0,0 +1,132 @@
+/*
+ * 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,
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+ * "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.AnalysisException
+import org.apache.spark.sql.catalyst.CatalystTypeConverters
+import org.apache.spark.sql.catalyst.expressions.{Expression, Literal}
+import org.apache.spark.sql.catalyst.plans.logical.{Call, CallArgument, 
LogicalPlan}
+import org.apache.spark.sql.catalyst.procedures.{IcebergProcedureRegistry, 
OptionalParameter, Parameter, Procedure}
+import org.apache.spark.sql.catalyst.rules.Rule
+import scala.collection.mutable
+
+// TODO: case sensitivity?
+object ResolveIcebergProcedures extends Rule[LogicalPlan] {

Review comment:
       I guess we can try to think how it can look like in Spark. For example, 
we may have something like this:
   
   ```
   public interface ProcedureCatalog extends CatalogPlugin {
     Procedure loadProcedure(Identifier ident);
   }
   
   public interface Procedure {
     String name();
     Parameter[] parameters();
     MethodHandle methodHandle();
   }
   ```
   
   We will have to keep these in `org.apache.spark.sql.connector.catalog` in 
Spark3 and implement in Iceberg catalogs.
   
   Then we can have generic rules for procedure resolution in spark3-extensions.
   
   @rdblue, is this what you mean?




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