[SPARK-54847][BUILD] unify the proto/antlr output folder between sbt and maven

### What changes were proposed in this pull request?

People may use sbt and maven together: local test with sbt, IDE with Maven. As of today this will trigger duplicated class issue during compilation, because sbt and Maven use different output folder for generated proto/antlr java classes. This PR updates the sbt build to use the same folder as Maven for proto/antlr output.

### Why are the changes needed?

Improve dev experience.

### Does this PR introduce _any_ user-facing change?

No

### How was this patch tested?

Manual test

### Was this patch authored or co-authored using generative AI tooling?

cursor 2.2.43

Closes #53616 from cloud-fan/shim.

Lead-authored-by: Wenchen Fan <[email protected]>
Co-authored-by: Wenchen Fan <[email protected]>
Signed-off-by: Wenchen Fan <[email protected]>

Author: cloud-fan

.sbtopts

@@ -0,0 +1,20 @@
+#
+# 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.
+#
+
+-J-Xmx8g
+-J-Xms8g
+-J-XX:MaxMetaspaceSize=1g

project/SparkBuild.scala

@@ -648,8 +648,10 @@ object Core {
         "com.google.protobuf" % "protobuf-java" % protoVersion % "protobuf"
       )
     },
+    // Use Maven's output directory so sbt and Maven can share generated sources.
+    // Core uses protoc-jar-maven-plugin which outputs to target/generated-sources.
     (Compile / PB.targets) := Seq(
-      PB.gens.java -> (Compile / sourceManaged).value
+      PB.gens.java -> target.value / "generated-sources"
     )
   ) ++ {
     val sparkProtocExecPath = sys.props.get("spark.protoc.executable.path")
@@ -734,19 +736,20 @@ object SparkConnectCommon {
   ) ++ {
     val sparkProtocExecPath = sys.props.get("spark.protoc.executable.path")
     val connectPluginExecPath = sys.props.get("connect.plugin.executable.path")
+    // Use Maven's output directory so sbt and Maven can share generated sources
     if (sparkProtocExecPath.isDefined && connectPluginExecPath.isDefined) {
       Seq(
         (Compile / PB.targets) := Seq(
-          PB.gens.java -> (Compile / sourceManaged).value,
-          PB.gens.plugin(name = "grpc-java", path = connectPluginExecPath.get) -> (Compile / sourceManaged).value
+          PB.gens.java -> target.value / "generated-sources" / "protobuf" / "java",
+          PB.gens.plugin(name = "grpc-java", path = connectPluginExecPath.get) -> target.value / "generated-sources" / "protobuf" / "grpc-java"
         ),
         PB.protocExecutable := file(sparkProtocExecPath.get)
       )
     } else {
       Seq(
         (Compile / PB.targets) := Seq(
-          PB.gens.java -> (Compile / sourceManaged).value,
-          PB.gens.plugin("grpc-java") -> (Compile / sourceManaged).value
+          PB.gens.java -> target.value / "generated-sources" / "protobuf" / "java",
+          PB.gens.plugin("grpc-java") -> target.value / "generated-sources" / "protobuf" / "grpc-java"
         )
       )
     }
@@ -1286,7 +1289,9 @@ object SqlApi {
     (Antlr4 / antlr4PackageName) := Some("org.apache.spark.sql.catalyst.parser"),
     (Antlr4 / antlr4GenListener) := true,
     (Antlr4 / antlr4GenVisitor) := true,
-    (Antlr4 / antlr4TreatWarningsAsErrors) := true
+    (Antlr4 / antlr4TreatWarningsAsErrors) := true,
+    // Use Maven's output directory so sbt and Maven can share generated sources
+    (Antlr4 / javaSource) := target.value / "generated-sources" / "antlr4"
   )
 }
 
@@ -1303,8 +1308,10 @@ object SQL {
         "com.google.protobuf" % "protobuf-java" % protoVersion % "protobuf"
       )
     },
+    // Use Maven's output directory so sbt and Maven can share generated sources.
+    // sql/core uses protoc-jar-maven-plugin which outputs to target/generated-sources.
     (Compile / PB.targets) := Seq(
-      PB.gens.java -> (Compile / sourceManaged).value
+      PB.gens.java -> target.value / "generated-sources"
     )
   ) ++ {
     val sparkProtocExecPath = sys.props.get("spark.protoc.executable.path")