fix: Mark WindowsExec as incompatible

common/src/main/scala/org/apache/comet/CometConf.scala

@@ -79,6 +79,8 @@ object CometConf extends ShimCometConf {
 
   val COMET_EXPR_CONFIG_PREFIX: String = s"$COMET_PREFIX.expression";
 
+  val COMET_OPERATOR_CONFIG_PREFIX: String = s"$COMET_PREFIX.operator";
+
   val COMET_ENABLED: ConfigEntry[Boolean] = conf("spark.comet.enabled")
     .category(CATEGORY_EXEC)
     .doc(
@@ -747,6 +749,18 @@ object CometConf extends ShimCometConf {
     s"${CometConf.COMET_EXPR_CONFIG_PREFIX}.${exprClass.getSimpleName}.allowIncompatible"
   }
 
+  def isOperatorAllowIncompat(name: String, conf: SQLConf = SQLConf.get): Boolean = {
+    getBooleanConf(getOperatorAllowIncompatConfigKey(name), defaultValue = false, conf)
+  }
+
+  def getOperatorAllowIncompatConfigKey(name: String): String = {
+    s"${CometConf.COMET_OPERATOR_CONFIG_PREFIX}.$name.allowIncompatible"
+  }
+
+  def getOperatorAllowIncompatConfigKey(exprClass: Class[_]): String = {
+    s"${CometConf.COMET_OPERATOR_CONFIG_PREFIX}.${exprClass.getSimpleName}.allowIncompatible"
+  }
+
   def getBooleanConf(name: String, defaultValue: Boolean, conf: SQLConf): Boolean = {
     conf.getConfString(name, defaultValue.toString).toLowerCase(Locale.ROOT) == "true"
   }

spark/src/main/scala/org/apache/comet/serde/CometOperatorSerde.scala

@@ -29,6 +29,22 @@ import org.apache.comet.serde.OperatorOuterClass.Operator
  */
 trait CometOperatorSerde[T <: SparkPlan] {
 
+  /**
+   * Get the optional Comet configuration entry that is used to enable or disable native support
+   * for this operator.
+   */
+  def enabledConfig: Option[ConfigEntry[Boolean]]
+
+  /**
+   * Determine the support level of the operator based on its attributes.
+   *
+   * @param operator
+   *   The Spark operator.
+   * @return
+   *   Support level (Compatible, Incompatible, or Unsupported).
+   */
+  def getSupportLevel(operator: T): SupportLevel = Compatible(None)
+
   /**
    * Convert a Spark operator into a protocol buffer representation that can be passed into native
    * code.
@@ -49,9 +65,4 @@ trait CometOperatorSerde[T <: SparkPlan] {
       builder: Operator.Builder,
       childOp: Operator*): Option[OperatorOuterClass.Operator]
 
-  /**
-   * Get the optional Comet configuration entry that is used to enable or disable native support
-   * for this operator.
-   */
-  def enabledConfig: Option[ConfigEntry[Boolean]]
 }

spark/src/main/scala/org/apache/comet/serde/QueryPlanSerde.scala

@@ -47,7 +47,7 @@ import org.apache.comet.serde.OperatorOuterClass.Operator
 import org.apache.comet.serde.Types.{DataType => ProtoDataType}
 import org.apache.comet.serde.Types.DataType._
 import org.apache.comet.serde.literals.CometLiteral
-import org.apache.comet.serde.operator.{CometLocalTableScan, CometProject, CometSort, CometSortOrder}
+import org.apache.comet.serde.operator._
 import org.apache.comet.shims.CometExprShim
 
 /**
@@ -61,8 +61,18 @@ object QueryPlanSerde extends Logging with CometExprShim {
   private val opSerdeMap: Map[Class[_ <: SparkPlan], CometOperatorSerde[_]] =
     Map(
       classOf[ProjectExec] -> CometProject,
+      classOf[FilterExec] -> CometFilter,
+      classOf[LocalLimitExec] -> CometLocalLimit,
+      classOf[GlobalLimitExec] -> CometGlobalLimit,
+      classOf[ExpandExec] -> CometExpand,
+      classOf[HashAggregateExec] -> CometHashAggregate,
+      classOf[ObjectHashAggregateExec] -> CometObjectHashAggregate,
+      classOf[BroadcastHashJoinExec] -> CometBroadcastHashJoin,
+      classOf[ShuffledHashJoinExec] -> CometShuffleHashJoin,
+      classOf[SortMergeJoinExec] -> CometSortMergeJoin,
       classOf[SortExec] -> CometSort,
-      classOf[LocalTableScanExec] -> CometLocalTableScan)
+      classOf[LocalTableScanExec] -> CometLocalTableScan,
+      classOf[WindowExec] -> CometWindow)
 
   private val arrayExpressions: Map[Class[_ <: Expression], CometExpressionSerde[_]] = Map(
     classOf[ArrayAppend] -> CometArrayAppend,
@@ -924,51 +934,26 @@ object QueryPlanSerde extends Logging with CometExprShim {
     val builder = OperatorOuterClass.Operator.newBuilder().setPlanId(op.id)
     childOp.foreach(builder.addChildren)
 
+    // look for registered handler first
+    val serde = opSerdeMap.get(op.getClass)
+    serde match {
+      case Some(handler) if isOperatorEnabled(handler, op) =>
+        val opSerde = handler.asInstanceOf[CometOperatorSerde[SparkPlan]]
+        val maybeConverted = opSerde.convert(op, builder, childOp: _*)
+        if (maybeConverted.isDefined) {
+          return maybeConverted
+        }
+      case _ =>
+    }
+
+    // now handle special cases that cannot be handled as a simple mapping from class name
+    // and see if operator can be used as a sink
     op match {
 
       // Fully native scan for V1
       case scan: CometScanExec if scan.scanImpl == CometConf.SCAN_NATIVE_DATAFUSION =>
         CometNativeScan.convert(scan, builder, childOp: _*)
 
-      case filter: FilterExec if CometConf.COMET_EXEC_FILTER_ENABLED.get(conf) =>
-        CometFilter.convert(filter, builder, childOp: _*)
-
-      case limit: LocalLimitExec if CometConf.COMET_EXEC_LOCAL_LIMIT_ENABLED.get(conf) =>
-        CometLocalLimit.convert(limit, builder, childOp: _*)
-
-      case globalLimitExec: GlobalLimitExec
-          if CometConf.COMET_EXEC_GLOBAL_LIMIT_ENABLED.get(conf) =>
-        CometGlobalLimit.convert(globalLimitExec, builder, childOp: _*)
-
-      case expand: ExpandExec if CometConf.COMET_EXEC_EXPAND_ENABLED.get(conf) =>
-        CometExpand.convert(expand, builder, childOp: _*)
-
-      case _: WindowExec if CometConf.COMET_EXEC_WINDOW_ENABLED.get(conf) =>
-        withInfo(op, "Window expressions are not supported")
-        None
-
-      case aggregate: HashAggregateExec if CometConf.COMET_EXEC_AGGREGATE_ENABLED.get(conf) =>
-        CometHashAggregate.convert(aggregate, builder, childOp: _*)
-
-      case aggregate: ObjectHashAggregateExec
-          if CometConf.COMET_EXEC_AGGREGATE_ENABLED.get(conf) =>
-        CometObjectHashAggregate.convert(aggregate, builder, childOp: _*)
-
-      case join: BroadcastHashJoinExec
-          if CometConf.COMET_EXEC_BROADCAST_HASH_JOIN_ENABLED.get(conf) =>
-        CometBroadcastHashJoin.convert(join, builder, childOp: _*)
-
-      case join: ShuffledHashJoinExec if CometConf.COMET_EXEC_HASH_JOIN_ENABLED.get(conf) =>
-        CometShuffleHashJoin.convert(join, builder, childOp: _*)
-
-      case join: SortMergeJoinExec =>
-        if (CometConf.COMET_EXEC_SORT_MERGE_JOIN_ENABLED.get(conf)) {
-          CometSortMergeJoin.convert(join, builder, childOp: _*)
-        } else {
-          withInfo(join, "SortMergeJoin is not enabled")
-          None
-        }
-
       case op if isCometSink(op) =>
         val supportedTypes =
           op.output.forall(a => supportedDataType(a.dataType, allowComplex = true))
@@ -1048,6 +1033,49 @@ object QueryPlanSerde extends Logging with CometExprShim {
     }
   }
 
+  private def isOperatorEnabled(handler: CometOperatorSerde[_], op: SparkPlan): Boolean = {
+    val enabled = handler.enabledConfig.forall(_.get(op.conf))
+    val opName = op.getClass.getSimpleName
+    if (enabled) {
+      val opSerde = handler.asInstanceOf[CometOperatorSerde[SparkPlan]]
+      opSerde.getSupportLevel(op) match {
+        case Unsupported(notes) =>
+          withInfo(op, notes.getOrElse(""))
+          false
+        case Incompatible(notes) =>
+          val allowIncompat = CometConf.isOperatorAllowIncompat(opName)
+          val incompatConf = CometConf.getOperatorAllowIncompatConfigKey(opName)
+          if (allowIncompat) {
+            if (notes.isDefined) {
+              logWarning(
+                s"Comet supports $opName when $incompatConf=true " +
+                  s"but has notes: ${notes.get}")
+            }
+            true
+          } else {
+            val optionalNotes = notes.map(str => s" ($str)").getOrElse("")
+            withInfo(
+              op,
+              s"$opName is not fully compatible with Spark$optionalNotes. " +
+                s"To enable it anyway, set $incompatConf=true. " +
+                s"${CometConf.COMPAT_GUIDE}.")
+            false
+          }
+        case Compatible(notes) =>
+          if (notes.isDefined) {
+            logWarning(s"Comet supports $opName but has notes: ${notes.get}")
+          }
+          true
+      }
+    } else {
+      withInfo(
+        op,
+        s"Native support for operator $opName is disabled. " +
+          s"Set ${handler.enabledConfig.get.key}=true to enable it.")
+      false
+    }
+  }
+
   /**
    * Whether the input Spark operator `op` can be considered as a Comet sink, i.e., the start of
    * native execution. If it is true, we'll wrap `op` with `CometScanWrapper` or
@@ -1066,7 +1094,6 @@ object QueryPlanSerde extends Logging with CometExprShim {
       case _: CollectLimitExec => true
       case _: UnionExec => true
       case _: TakeOrderedAndProjectExec => true
-      case _: WindowExec => true
       case _ => false
     }
   }
@@ -1144,25 +1171,3 @@ object QueryPlanSerde extends Logging with CometExprShim {
   }
 
 }
-
-sealed trait SupportLevel
-
-/**
- * Comet either supports this feature with full compatibility with Spark, or may have known
- * differences in some specific edge cases that are unlikely to be an issue for most users.
- *
- * Any compatibility differences are noted in the
- * [[https://datafusion.apache.org/comet/user-guide/compatibility.html Comet Compatibility Guide]].
- */
-case class Compatible(notes: Option[String] = None) extends SupportLevel
-
-/**
- * Comet supports this feature but results can be different from Spark.
- *
- * Any compatibility differences are noted in the
- * [[https://datafusion.apache.org/comet/user-guide/compatibility.html Comet Compatibility Guide]].
- */
-case class Incompatible(notes: Option[String] = None) extends SupportLevel
-
-/** Comet does not support this feature */
-case class Unsupported(notes: Option[String] = None) extends SupportLevel

spark/src/main/scala/org/apache/comet/serde/SupportLevel.scala

@@ -0,0 +1,42 @@
+/*
+ * 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.comet.serde
+
+sealed trait SupportLevel
+
+/**
+ * Comet either supports this feature with full compatibility with Spark, or may have known
+ * differences in some specific edge cases that are unlikely to be an issue for most users.
+ *
+ * Any compatibility differences are noted in the
+ * [[https://datafusion.apache.org/comet/user-guide/compatibility.html Comet Compatibility Guide]].
+ */
+case class Compatible(notes: Option[String] = None) extends SupportLevel
+
+/**
+ * Comet supports this feature but results can be different from Spark.
+ *
+ * Any compatibility differences are noted in the
+ * [[https://datafusion.apache.org/comet/user-guide/compatibility.html Comet Compatibility Guide]].
+ */
+case class Incompatible(notes: Option[String] = None) extends SupportLevel
+
+/** Comet does not support this feature */
+case class Unsupported(notes: Option[String] = None) extends SupportLevel

spark/src/main/scala/org/apache/comet/serde/CometAggregate.scala → spark/src/main/scala/org/apache/comet/serde/operator/CometAggregate.scala

@@ -17,7 +17,7 @@
  * under the License.
  */
 
-package org.apache.comet.serde
+package org.apache.comet.serde.operator
 
 import scala.jdk.CollectionConverters._
 
@@ -28,6 +28,7 @@ import org.apache.spark.sql.types.MapType
 
 import org.apache.comet.{CometConf, ConfigEntry}
 import org.apache.comet.CometSparkSessionExtensions.withInfo
+import org.apache.comet.serde.{CometOperatorSerde, OperatorOuterClass}
 import org.apache.comet.serde.OperatorOuterClass.{AggregateMode => CometAggregateMode, Operator}
 import org.apache.comet.serde.QueryPlanSerde.{aggExprToProto, exprToProto}
 

spark/src/main/scala/org/apache/comet/serde/CometExpand.scala → spark/src/main/scala/org/apache/comet/serde/operator/CometExpand.scala

@@ -17,7 +17,7 @@
  * under the License.
  */
 
-package org.apache.comet.serde
+package org.apache.comet.serde.operator
 
 import scala.jdk.CollectionConverters._
 
@@ -26,6 +26,7 @@ import org.apache.spark.sql.execution.ExpandExec
 
 import org.apache.comet.{CometConf, ConfigEntry}
 import org.apache.comet.CometSparkSessionExtensions.withInfo
+import org.apache.comet.serde.{CometOperatorSerde, OperatorOuterClass}
 import org.apache.comet.serde.OperatorOuterClass.Operator
 import org.apache.comet.serde.QueryPlanSerde.exprToProto
 

spark/src/main/scala/org/apache/comet/serde/CometFilter.scala → spark/src/main/scala/org/apache/comet/serde/operator/CometFilter.scala

@@ -17,12 +17,13 @@
  * under the License.
  */
 
-package org.apache.comet.serde
+package org.apache.comet.serde.operator
 
 import org.apache.spark.sql.execution.FilterExec
 
 import org.apache.comet.{CometConf, ConfigEntry}
 import org.apache.comet.CometSparkSessionExtensions.withInfo
+import org.apache.comet.serde.{CometOperatorSerde, OperatorOuterClass}
 import org.apache.comet.serde.OperatorOuterClass.Operator
 import org.apache.comet.serde.QueryPlanSerde.exprToProto
 

spark/src/main/scala/org/apache/comet/serde/CometGlobalLimit.scala → spark/src/main/scala/org/apache/comet/serde/operator/CometGlobalLimit.scala

@@ -17,12 +17,13 @@
  * under the License.
  */
 
-package org.apache.comet.serde
+package org.apache.comet.serde.operator
 
 import org.apache.spark.sql.execution.GlobalLimitExec
 
 import org.apache.comet.{CometConf, ConfigEntry}
 import org.apache.comet.CometSparkSessionExtensions.withInfo
+import org.apache.comet.serde.{CometOperatorSerde, OperatorOuterClass}
 import org.apache.comet.serde.OperatorOuterClass.Operator
 
 object CometGlobalLimit extends CometOperatorSerde[GlobalLimitExec] {

spark/src/main/scala/org/apache/comet/serde/CometHashJoin.scala → spark/src/main/scala/org/apache/comet/serde/operator/CometHashJoin.scala

@@ -17,17 +17,18 @@
  * under the License.
  */
 
-package org.apache.comet.serde
+package org.apache.comet.serde.operator
 
 import scala.jdk.CollectionConverters._
 
 import org.apache.spark.sql.catalyst.expressions.Expression
 import org.apache.spark.sql.catalyst.optimizer.{BuildLeft, BuildRight}
-import org.apache.spark.sql.catalyst.plans.{FullOuter, Inner, LeftAnti, LeftOuter, LeftSemi, RightOuter}
+import org.apache.spark.sql.catalyst.plans._
 import org.apache.spark.sql.execution.joins.{BroadcastHashJoinExec, HashJoin, ShuffledHashJoinExec}
 
 import org.apache.comet.{CometConf, ConfigEntry}
 import org.apache.comet.CometSparkSessionExtensions.withInfo
+import org.apache.comet.serde.{CometOperatorSerde, OperatorOuterClass}
 import org.apache.comet.serde.OperatorOuterClass.{BuildSide, JoinType, Operator}
 import org.apache.comet.serde.QueryPlanSerde.exprToProto
 

spark/src/main/scala/org/apache/comet/serde/CometLocalLimit.scala → spark/src/main/scala/org/apache/comet/serde/operator/CometLocalLimit.scala

@@ -17,12 +17,13 @@
  * under the License.
  */
 
-package org.apache.comet.serde
+package org.apache.comet.serde.operator
 
 import org.apache.spark.sql.execution.LocalLimitExec
 
 import org.apache.comet.{CometConf, ConfigEntry}
 import org.apache.comet.CometSparkSessionExtensions.withInfo
+import org.apache.comet.serde.{CometOperatorSerde, OperatorOuterClass}
 import org.apache.comet.serde.OperatorOuterClass.Operator
 
 object CometLocalLimit extends CometOperatorSerde[LocalLimitExec] {

spark/src/main/scala/org/apache/comet/serde/CometNativeScan.scala → spark/src/main/scala/org/apache/comet/serde/operator/CometNativeScan.scala

@@ -17,7 +17,7 @@
  * under the License.
  */
 
-package org.apache.comet.serde
+package org.apache.comet.serde.operator
 
 import scala.collection.mutable.ListBuffer
 import scala.jdk.CollectionConverters._
@@ -35,6 +35,7 @@ import org.apache.comet.{CometConf, ConfigEntry}
 import org.apache.comet.CometSparkSessionExtensions.withInfo
 import org.apache.comet.objectstore.NativeConfig
 import org.apache.comet.parquet.CometParquetUtils
+import org.apache.comet.serde.{CometOperatorSerde, OperatorOuterClass}
 import org.apache.comet.serde.ExprOuterClass.Expr
 import org.apache.comet.serde.OperatorOuterClass.Operator
 import org.apache.comet.serde.QueryPlanSerde.{exprToProto, serializeDataType}