luis4a0 commented on code in PR #13103:
URL: https://github.com/apache/gluten/pull/13103#discussion_r4269482416


##########
ep/build-velox/src/get-velox.sh:
##########
@@ -25,7 +25,7 @@ RUN_SETUP_SCRIPT=ON
 ENABLE_ENHANCED_FEATURES=OFF
 
 # Developer use only for testing Velox PR.
-UPSTREAM_VELOX_PR_ID=""
+UPSTREAM_VELOX_PR_ID="19141"

Review Comment:
   Agreed that this must not become the normal merged dependency. This revision 
is intentionally a dependency-blocked validation companion: Rui explicitly 
requested exercising the upstream PR through the existing developer hook at 
https://github.com/facebookincubator/velox/pull/19141#discussion_r4264992214 . 
Clearing the hook now would test the stock dependency without the decimal fix. 
The PR description records the merge gate: land the upstream fix, qualify a 
normal dependency containing it, then restore the empty hook before merging. 
Keeping this thread open to track that required dependency step.



##########
gluten-ut/common/src/test/scala/org/apache/spark/sql/GlutenDecimalRoundSuite.scala:
##########
@@ -0,0 +1,137 @@
+/*
+ * 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
+
+import org.apache.gluten.config.GlutenConfig
+import org.apache.gluten.execution.ProjectExecTransformer
+
+import org.apache.spark.sql.catalyst.expressions.Round
+import org.apache.spark.sql.catalyst.optimizer.NullPropagation
+import org.apache.spark.sql.internal.SQLConf
+import org.apache.spark.sql.types._
+
+import scala.collection.JavaConverters._
+
+class GlutenDecimalRoundSuite extends GlutenSQLTestsTrait {
+  private def withInput(dataType: DecimalType, values: Seq[String])(f: => 
Unit): Unit = {
+    val schema = new StructType().add("value", dataType)
+    val rows = values.map(value => Row(new java.math.BigDecimal(value))) :+ 
Row(null)
+    withSQLConf(
+      SQLConf.ADAPTIVE_EXECUTION_ENABLED.key -> "false",
+      GlutenConfig.GLUTEN_ANSI_FALLBACK_ENABLED.key -> "false") {
+      withTempPath {
+        path =>
+          spark.createDataFrame(rows.asJava, 
schema).coalesce(1).write.parquet(path.toString)
+          withTempView("decimal_round_input") {
+            
spark.read.parquet(path.toString).createOrReplaceTempView("decimal_round_input")
+            f
+          }
+      }
+    }
+  }
+
+  private def assertExecution(df: DataFrame, native: Boolean): Unit = {
+    val plan = df.queryExecution.executedPlan
+    val locations = plan.collect {
+      case node if node.expressions.exists(_.exists(_.isInstanceOf[Round])) =>
+        node.isInstanceOf[ProjectExecTransformer]
+    }
+    assert(
+      locations.nonEmpty && locations.forall(_ == native),
+      s"Unexpected ROUND execution:\n$plan")
+  }
+
+  private def checkRound(scale: String, native: Boolean = true): Unit = {
+    val query = s"SELECT round(value, $scale) FROM decimal_round_input"
+    withSQLConf(GlutenConfig.GLUTEN_ENABLED.key -> "false") {
+      val vanilla = sql(query)
+      val expectedSchema = vanilla.schema
+      val expected = vanilla.collect().toSeq
+      withSQLConf(GlutenConfig.GLUTEN_ENABLED.key -> "true") {
+        val df = sql(query)
+        assertExecution(df, native)
+        assert(df.schema == expectedSchema)
+        checkAnswer(df, expected)
+      }
+    }
+  }
+
+  testGluten("decimal ROUND preserves schemas and HALF_UP results across 
storage boundaries") {
+    val cases = Seq(
+      (DecimalType(3, 1), Seq("2.5", "-2.5", "0")),
+      (DecimalType(18, 0), Seq("999999999999999999", "-999999999999999999")),
+      (DecimalType(19, 0), Seq("9999999999999999999", "-9999999999999999999")),
+      (DecimalType(38, 1), Seq("9" * 37 + ".9", "-" + "9" * 37 + ".9")),
+      (DecimalType(38, 38), Seq("0.6", "-0.6", "0.5", "-0.5"))
+    )
+    for ((dataType, values) <- cases) {
+      withInput(dataType, values) {
+        for (ansi <- Seq("false", "true")) {
+          withSQLConf(SQLConf.ANSI_ENABLED.key -> ansi) {
+            Seq(-400, -39, -1, 0, 1, 38, 400).foreach(scale => 
checkRound(scale.toString))
+            checkRound("-1 + 0")
+          }
+        }
+      }
+    }
+  }
+
+  testGluten("decimal ROUND handles the 38-digit HALF_UP tie and precision 
overflow") {
+    withInput(DecimalType(38, 0), Seq("4" + "9" * 37, "-4" + "9" * 37)) {
+      checkRound("-38")
+    }
+    for ((value, scale) <- Seq(("9" * 38, -1), ("5" + "0" * 37, -38), ("-5" + 
"0" * 37, -38))) {
+      withInput(DecimalType(38, 0), Seq(value)) {
+        for (ansi <- Seq("false", "true")) {
+          withSQLConf(SQLConf.ANSI_ENABLED.key -> ansi) {
+            val query = s"SELECT round(value, $scale) FROM decimal_round_input"
+            withSQLConf(GlutenConfig.GLUTEN_ENABLED.key -> "false") {
+              val error = intercept[Exception](sql(query).collect())
+              
assert(Iterator.iterate[Throwable](error)(_.getCause).takeWhile(_ != 
null).exists {
+                cause =>
+                  Option(cause.getMessage).exists {
+                    message =>
+                      message.contains("NUMERIC_VALUE_OUT_OF_RANGE") ||
+                      
message.contains("DECIMAL_PRECISION_EXCEEDS_MAX_PRECISION")
+                  }
+              })
+            }
+            val df = sql(query)
+            assertExecution(df, native = true)
+            val error = intercept[Exception](df.collect())
+            assert(Iterator.iterate[Throwable](error)(_.getCause).takeWhile(_ 
!= null).exists {
+              cause => Option(cause.getMessage).exists(_.contains("Decimal 
overflow"))
+            })

Review Comment:
   Keeping the narrow assertion intentionally. The upstream implementation 
under test explicitly reports `Decimal overflow in ...`: 
https://github.com/facebookincubator/velox/blob/d36b87cc2688500d8b646cc30bc998a13aca8947/velox/functions/sparksql/specialforms/DecimalRound.cpp#L171-L177
 . Its structured status is a generic user error, which would also admit 
unrelated conversion or metadata failures. The Spark-side allowlist covers two 
diagnostic identifiers actually observed across supported releases; there is no 
corresponding native diagnostic variation in this dependency. A future native 
diagnostic-contract change should update this focused assertion deliberately 
rather than silently accepting unrelated failures.



##########
gluten-ut/common/src/test/scala/org/apache/spark/sql/GlutenDecimalRoundSuite.scala:
##########
@@ -0,0 +1,137 @@
+/*
+ * 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
+
+import org.apache.gluten.config.GlutenConfig
+import org.apache.gluten.execution.ProjectExecTransformer
+
+import org.apache.spark.sql.catalyst.expressions.Round
+import org.apache.spark.sql.catalyst.optimizer.NullPropagation
+import org.apache.spark.sql.internal.SQLConf
+import org.apache.spark.sql.types._
+
+import scala.collection.JavaConverters._

Review Comment:
   This shared suite is also compiled on Scala 2.12 for Spark 3.4/3.5. 
`JavaConverters` works on both Scala 2.12 and 2.13 and matches the existing 
common-test convention: 
https://github.com/apache/gluten/blob/d66fbf998a83cac065e3275ba1e3503494a3862c/gluten-ut/common/src/test/scala/org/apache/spark/sql/GlutenSQLTestsTrait.scala#L34
 . Keeping that cross-version common-module convention intentionally; the 
deprecation is a compatibility tradeoff here. The maintained suite was compiled 
and run on Spark 3.4.4, 3.5.5, 4.0.2 and 4.1.1.



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