Adding SparkSQLProperty for split-size

Author: shanthoosh

spark/v3.3/spark/src/main/java/org/apache/iceberg/spark/SparkReadConf.java

@@ -191,6 +191,7 @@ public long splitSize() {
     return confParser
         .longConf()
         .option(SparkReadOptions.SPLIT_SIZE)
+        .sessionConf(SparkSQLProperties.SPLIT_SIZE)
         .tableProperty(TableProperties.SPLIT_SIZE)
         .defaultValue(TableProperties.SPLIT_SIZE_DEFAULT)
         .parse();

spark/v3.3/spark/src/main/java/org/apache/iceberg/spark/SparkSQLProperties.java

@@ -66,4 +66,7 @@ private SparkSQLProperties() {}
 
   // Controls whether to report locality information to Spark while allocating input partitions
   public static final String LOCALITY = "spark.sql.iceberg.locality.enabled";
+
+  // Controls the spark input split size.
+  public static final String SPLIT_SIZE = "spark.sql.iceberg.split-size";
 }

spark/v3.4/spark/src/main/java/org/apache/iceberg/spark/SparkReadConf.java

@@ -201,6 +201,7 @@ public long splitSize() {
     return confParser
         .longConf()
         .option(SparkReadOptions.SPLIT_SIZE)
+        .sessionConf(SparkSQLProperties.SPLIT_SIZE)
         .tableProperty(TableProperties.SPLIT_SIZE)
         .defaultValue(TableProperties.SPLIT_SIZE_DEFAULT)
         .parse();

spark/v3.5/spark/src/main/java/org/apache/iceberg/spark/SparkReadConf.java

@@ -199,6 +199,7 @@ public long splitSize() {
     return confParser
         .longConf()
         .option(SparkReadOptions.SPLIT_SIZE)
+        .sessionConf(SparkSQLProperties.SPLIT_SIZE)
         .tableProperty(TableProperties.SPLIT_SIZE)
         .defaultValue(TableProperties.SPLIT_SIZE_DEFAULT)
         .parse();