[SPARK-49673][CONNECT] Increase CONNECT_GRPC_ARROW_MAX_BATCH_SIZE to …

…0.7 * CONNECT_GRPC_MAX_MESSAGE_SIZE

### What changes were proposed in this pull request?
Increases the default `maxBatchSize` from 4MiB * 0.7 to 128MiB (=
CONNECT_GRPC_MAX_MESSAGE_SIZE) * 0.7. This makes better use of the allowed maximum message size.
This limit is used when creating Arrow batches for the `SqlCommandResult` in the `SparkConnectPlanner` and for `ExecutePlanResponse.ArrowBatch` in `processAsArrowBatches`. This, for example, lets us return much larger `LocalRelations` in the `SqlCommandResult` (i.e., for the `SHOW PARTITIONS` command) while still staying within the GRPC message size limit.

### Why are the changes needed?
There are `SqlCommandResults` that exceed 0.7 * 4MiB.

### Does this PR introduce _any_ user-facing change?
Now support `SqlCommandResults` <= 0.7 * 128 MiB instead of only <= 0.7 * 4MiB and ExecutePlanResponses will now better use the limit of 128MiB.

### How was this patch tested?
Existing tests.

### Was this patch authored or co-authored using generative AI tooling?
No.

Closes #48122 from dillitz/increase-sql-command-batch-size.

Authored-by: Robert Dillitz <robert.dillitz@databricks.com>
Signed-off-by: Hyukjin Kwon <gurwls223@apache.org>

connector/connect/client/jvm/src/test/scala/org/apache/spark/sql/ClientE2ETestSuite.scala

@@ -23,7 +23,7 @@ import java.util.Properties
 
 import scala.collection.mutable
 import scala.concurrent.{ExecutionContext, Future}
-import scala.concurrent.duration.DurationInt
+import scala.concurrent.duration.{DurationInt, FiniteDuration}
 import scala.jdk.CollectionConverters._
 
 import org.apache.commons.io.FileUtils
@@ -37,7 +37,7 @@ import org.apache.spark.sql.catalyst.analysis.{NamespaceAlreadyExistsException,
 import org.apache.spark.sql.catalyst.encoders.AgnosticEncoders.StringEncoder
 import org.apache.spark.sql.catalyst.expressions.GenericRowWithSchema
 import org.apache.spark.sql.catalyst.parser.ParseException
-import org.apache.spark.sql.connect.client.{SparkConnectClient, SparkResult}
+import org.apache.spark.sql.connect.client.{RetryPolicy, SparkConnectClient, SparkResult}
 import org.apache.spark.sql.functions._
 import org.apache.spark.sql.internal.SqlApiConf
 import org.apache.spark.sql.test.{ConnectFunSuite, IntegrationTestUtils, RemoteSparkSession, SQLHelper}
@@ -1566,6 +1566,25 @@ class ClientE2ETestSuite
     val result = df.select(trim(col("col"), " ").as("trimmed_col")).collect()
     assert(result sameElements Array(Row("a"), Row("b"), Row("c")))
   }
+
+  test("SPARK-49673: new batch size, multiple batches") {
+    val maxBatchSize = spark.conf.get("spark.connect.grpc.arrow.maxBatchSize").dropRight(1).toInt
+    // Adjust client grpcMaxMessageSize to maxBatchSize (10MiB; set in RemoteSparkSession config)
+    val sparkWithLowerMaxMessageSize = SparkSession
+      .builder()
+      .client(
+        SparkConnectClient
+          .builder()
+          .userId("test")
+          .port(port)
+          .grpcMaxMessageSize(maxBatchSize)
+          .retryPolicy(RetryPolicy
+            .defaultPolicy()
+            .copy(maxRetries = Some(10), maxBackoff = Some(FiniteDuration(30, "s"))))
+          .build())
+      .create()
+    assert(sparkWithLowerMaxMessageSize.range(maxBatchSize).collect().length == maxBatchSize)
+  }
 }
 
 private[sql] case class ClassData(a: String, b: Int)

connector/connect/client/jvm/src/test/scala/org/apache/spark/sql/test/RemoteSparkSession.scala

@@ -124,6 +124,8 @@ object SparkConnectServerUtils {
       // to make the tests exercise reattach.
       "spark.connect.execute.reattachable.senderMaxStreamDuration=1s",
       "spark.connect.execute.reattachable.senderMaxStreamSize=123",
+      // Testing SPARK-49673, setting maxBatchSize to 10MiB
+      s"spark.connect.grpc.arrow.maxBatchSize=${10 * 1024 * 1024}",
       // Disable UI
       "spark.ui.enabled=false")
     Seq("--jars", catalystTestJar) ++ confs.flatMap(v => "--conf" :: v :: Nil)

sql/connect/server/src/main/scala/org/apache/spark/sql/connect/config/Connect.scala

@@ -63,7 +63,7 @@ object Connect {
           "conservatively use 70% of it because the size is not accurate but estimated.")
       .version("3.4.0")
       .bytesConf(ByteUnit.BYTE)
-      .createWithDefault(4 * 1024 * 1024)
+      .createWithDefault(ConnectCommon.CONNECT_GRPC_MAX_MESSAGE_SIZE)
 
   val CONNECT_GRPC_MAX_INBOUND_MESSAGE_SIZE =
     buildStaticConf("spark.connect.grpc.maxInboundMessageSize")