aokolnychyi commented on a change in pull request #1852:
URL: https://github.com/apache/iceberg/pull/1852#discussion_r533419668



##########
File path: 
spark3-extensions/src/main/scala/org/apache/spark/sql/catalyst/analysis/DeleteFromTablePredicateCheck.scala
##########
@@ -0,0 +1,49 @@
+/*
+ * 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.AnalysisException
+import org.apache.spark.sql.catalyst.expressions.{Expression, InSubquery, Not}
+import org.apache.spark.sql.catalyst.plans.logical.{DeleteFromTable, 
LogicalPlan}
+
+object DeleteFromTablePredicateCheck extends (LogicalPlan => Unit) {
+
+  override def apply(plan: LogicalPlan): Unit = {
+    plan foreach {
+      case DeleteFromTable(_, Some(condition)) if 
hasNullAwarePredicateWithinNot(condition) =>

Review comment:
       Currently, Spark will fail all delete requests with subqueries so it 
felt OK. I do see the concern, though. I don't mind adding an extra check if we 
think it is worth it.




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