[NSE-856] Optimize of string/binary split

native-sql-engine/cpp/CMakeLists.txt

@@ -1,8 +1,8 @@
 cmake_minimum_required(VERSION 3.16)
 project(spark_columnar_plugin)
 
-#add_definitions(-DSKIPWRITE -DSKIPCOMPRESS -DPROCESSROW)
-add_definitions(-DPROCESSROW)
+#add_definitions(-DSKIPWRITE -DSKIPCOMPRESS )
+#add_definitions(-DAVX512SUPPORT )
 
 #add_compile_options(-g)
 set(CMAKE_EXPORT_COMPILE_COMMANDS ON)

native-sql-engine/cpp/src/benchmarks/shuffle_split_benchmark.cc

@@ -51,7 +51,7 @@ void print_trace(void) {
 namespace sparkcolumnarplugin {
 namespace shuffle {
 
-#define ALIGNMENT 2048 * 1024
+#define ALIGNMENT 2 * 1024 * 1024
 
 const int batch_buffer_size = 32768;
 const int split_buffer_size = 8192;
@@ -127,7 +127,7 @@ class LargePageMemoryPool : public MemoryPool {
       return pool_->Reallocate(old_size, new_size, ptr);
     } else {
       Status st = pool_->AlignReallocate(old_size, new_size, ptr, ALIGNMENT);
-      // madvise(*ptr, new_size, /*MADV_HUGEPAGE */ 14);
+      madvise(*ptr, new_size, /*MADV_HUGEPAGE */ 14);
       return st;
     }
 #else
@@ -320,28 +320,30 @@ class BenchmarkShuffleSplit_CacheScan_Benchmark : public BenchmarkShuffleSplit {
                 int64_t& num_batches, int64_t& num_rows, int64_t& split_time,
                 const int num_partitions, SplitOptions options, benchmark::State& state) {
     std::vector<int> local_column_indices;
-    local_column_indices.push_back(0);
+    // local_column_indices.push_back(0);
     /*    local_column_indices.push_back(0);
         local_column_indices.push_back(1);
         local_column_indices.push_back(2);
         local_column_indices.push_back(4);
         local_column_indices.push_back(5);
         local_column_indices.push_back(6);
-        local_column_indices.push_back(7);*/
+        local_column_indices.push_back(7);
+*/
+    local_column_indices.push_back(8);
+    local_column_indices.push_back(9);
+    local_column_indices.push_back(13);
+    local_column_indices.push_back(14);
+    local_column_indices.push_back(15);
 
     std::shared_ptr<arrow::Schema> local_schema;
-    local_schema = std::make_shared<arrow::Schema>(*schema.get());
-
-    /*    ARROW_ASSIGN_OR_THROW(local_schema, local_schema->RemoveField(15));
-        ARROW_ASSIGN_OR_THROW(local_schema, local_schema->RemoveField(14));
-        ARROW_ASSIGN_OR_THROW(local_schema, local_schema->RemoveField(13));
-        ARROW_ASSIGN_OR_THROW(local_schema, local_schema->RemoveField(12));
-        ARROW_ASSIGN_OR_THROW(local_schema, local_schema->RemoveField(11));
-        ARROW_ASSIGN_OR_THROW(local_schema, local_schema->RemoveField(10));
-        ARROW_ASSIGN_OR_THROW(local_schema, local_schema->RemoveField(9));
-        ARROW_ASSIGN_OR_THROW(local_schema, local_schema->RemoveField(8));
-        ARROW_ASSIGN_OR_THROW(local_schema, local_schema->RemoveField(3));
-    */
+    arrow::FieldVector fields;
+    fields.push_back(schema->field(8));
+    fields.push_back(schema->field(9));
+    fields.push_back(schema->field(13));
+    fields.push_back(schema->field(14));
+    fields.push_back(schema->field(15));
+    local_schema = std::make_shared<arrow::Schema>(fields);
+
     if (state.thread_index() == 0) std::cout << local_schema->ToString() << std::endl;
 
     ARROW_ASSIGN_OR_THROW(splitter,