chore: Fallback to Spark for windows

Author: comphead

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

@@ -251,7 +251,7 @@ object CometConf extends ShimCometConf {
   val COMET_EXEC_EXPAND_ENABLED: ConfigEntry[Boolean] =
     createExecEnabledConfig("expand", defaultValue = true)
   val COMET_EXEC_WINDOW_ENABLED: ConfigEntry[Boolean] =
-    createExecEnabledConfig("window", defaultValue = true)
+    createExecEnabledConfig("window", defaultValue = false)
   val COMET_EXEC_TAKE_ORDERED_AND_PROJECT_ENABLED: ConfigEntry[Boolean] =
     createExecEnabledConfig("takeOrderedAndProject", defaultValue = true)
 

spark/src/test/scala/org/apache/comet/exec/CometWindowExecSuite.scala

@@ -258,7 +258,7 @@ class CometWindowExecSuite extends CometTestBase {
     }
   }
 
-  test("Windows support") {
+  ignore("Windows support") {
     Seq("true", "false").foreach(aqeEnabled =>
       withSQLConf(
         CometConf.COMET_EXEC_SHUFFLE_ENABLED.key -> "true",
@@ -284,7 +284,7 @@ class CometWindowExecSuite extends CometTestBase {
               s"SELECT $function OVER(order by _2 rows between current row and 1 following) FROM t1")
 
             queries.foreach { query =>
-              checkSparkAnswerAndOperator(query)
+              checkSparkAnswerAndFallbackReason(query, "Window expressions are not supported")
             }
           }
         }
@@ -303,7 +303,7 @@ class CometWindowExecSuite extends CometTestBase {
 
       spark.read.parquet(dir.toString).createOrReplaceTempView("window_test")
       val df = sql("SELECT a, b, c, COUNT(*) OVER () as cnt FROM window_test")
-      checkSparkAnswerAndOperator(df)
+      checkSparkAnswerAndFallbackReason(df, "Window expressions are not supported")
     }
   }
 
@@ -319,7 +319,7 @@ class CometWindowExecSuite extends CometTestBase {
 
       spark.read.parquet(dir.toString).createOrReplaceTempView("window_test")
       val df = sql("SELECT a, b, c, SUM(c) OVER (PARTITION BY a) as sum_c FROM window_test")
-      checkSparkAnswerAndOperator(df)
+      checkSparkAnswerAndFallbackReason(df, "Window expressions are not supported")
     }
   }
 
@@ -359,7 +359,7 @@ class CometWindowExecSuite extends CometTestBase {
           MAX(c) OVER (ORDER BY b) as max_c
         FROM window_test
       """)
-      checkSparkAnswerAndOperator(df)
+      checkSparkAnswerAndFallbackReason(df, "Window expressions are not supported")
     }
   }