liutang123 commented on a change in pull request #3025:
URL: https://github.com/apache/incubator-doris/pull/3025#discussion_r521096363



##########
File path: be/src/olap/column_vector.cpp
##########
@@ -0,0 +1,212 @@
+// 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.
+
+#include "column_vector.h"
+#include "olap/field.h"
+
+namespace doris {
+
+ColumnVectorBatch::~ColumnVectorBatch() = default;
+
+Status ColumnVectorBatch::resize(size_t new_cap) {
+    if (_nullable) {
+        _null_signs.resize(new_cap);
+    }
+    _capacity = new_cap;
+    return Status::OK();
+}
+
+Status ColumnVectorBatch::create(size_t init_capacity,
+        bool is_nullable,
+        const TypeInfo* type_info,
+        Field* field,
+        std::unique_ptr<ColumnVectorBatch>* column_vector_batch) {
+    if (is_scalar_type(type_info->type())) {
+        std::unique_ptr<ColumnVectorBatch> local;
+        switch (type_info->type()) {
+            case OLAP_FIELD_TYPE_BOOL:
+                local.reset(new 
ScalarColumnVectorBatch<CppTypeTraits<OLAP_FIELD_TYPE_BOOL>::CppType>(type_info,
 is_nullable));
+                break;
+            case OLAP_FIELD_TYPE_TINYINT:
+                local.reset(new 
ScalarColumnVectorBatch<CppTypeTraits<OLAP_FIELD_TYPE_TINYINT>::CppType>(type_info,
 is_nullable));
+                break;
+            case OLAP_FIELD_TYPE_SMALLINT:
+                local.reset(new 
ScalarColumnVectorBatch<CppTypeTraits<OLAP_FIELD_TYPE_SMALLINT>::CppType>(type_info,
 is_nullable));
+                break;
+            case OLAP_FIELD_TYPE_INT:
+                local.reset(new 
ScalarColumnVectorBatch<CppTypeTraits<OLAP_FIELD_TYPE_INT>::CppType>(type_info, 
is_nullable));
+                break;
+            case OLAP_FIELD_TYPE_UNSIGNED_INT:
+                local.reset(new 
ScalarColumnVectorBatch<CppTypeTraits<OLAP_FIELD_TYPE_UNSIGNED_INT>::CppType>(type_info,
 is_nullable));
+                break;
+            case OLAP_FIELD_TYPE_BIGINT:
+                local.reset(new 
ScalarColumnVectorBatch<CppTypeTraits<OLAP_FIELD_TYPE_BIGINT>::CppType>(type_info,
 is_nullable));
+                break;
+            case OLAP_FIELD_TYPE_UNSIGNED_BIGINT:
+                local.reset(new 
ScalarColumnVectorBatch<CppTypeTraits<OLAP_FIELD_TYPE_UNSIGNED_BIGINT>::CppType>(type_info,
 is_nullable));
+                break;
+            case OLAP_FIELD_TYPE_LARGEINT:
+                local.reset(new 
ScalarColumnVectorBatch<CppTypeTraits<OLAP_FIELD_TYPE_LARGEINT>::CppType>(type_info,
 is_nullable));
+                break;
+            case OLAP_FIELD_TYPE_FLOAT:
+                local.reset(new 
ScalarColumnVectorBatch<CppTypeTraits<OLAP_FIELD_TYPE_FLOAT>::CppType>(type_info,
 is_nullable));
+                break;
+            case OLAP_FIELD_TYPE_DOUBLE:
+                local.reset(new 
ScalarColumnVectorBatch<CppTypeTraits<OLAP_FIELD_TYPE_DOUBLE>::CppType>(type_info,
 is_nullable));
+                break;
+            case OLAP_FIELD_TYPE_DECIMAL:
+                local.reset(new 
ScalarColumnVectorBatch<CppTypeTraits<OLAP_FIELD_TYPE_DECIMAL>::CppType>(type_info,
 is_nullable));
+                break;
+            case OLAP_FIELD_TYPE_DATE:
+                local.reset(new 
ScalarColumnVectorBatch<CppTypeTraits<OLAP_FIELD_TYPE_DATE>::CppType>(type_info,
 is_nullable));
+                break;
+            case OLAP_FIELD_TYPE_DATETIME:
+                local.reset(new 
ScalarColumnVectorBatch<CppTypeTraits<OLAP_FIELD_TYPE_DATETIME>::CppType>(type_info,
 is_nullable));
+                break;
+            case OLAP_FIELD_TYPE_CHAR:
+                local.reset(new 
ScalarColumnVectorBatch<CppTypeTraits<OLAP_FIELD_TYPE_CHAR>::CppType>(type_info,
 is_nullable));
+                break;
+            case OLAP_FIELD_TYPE_VARCHAR:
+                local.reset(new 
ScalarColumnVectorBatch<CppTypeTraits<OLAP_FIELD_TYPE_VARCHAR>::CppType>(type_info,
 is_nullable));
+                break;
+            case OLAP_FIELD_TYPE_HLL:
+                local.reset(new 
ScalarColumnVectorBatch<CppTypeTraits<OLAP_FIELD_TYPE_HLL>::CppType>(type_info, 
is_nullable));
+                break;
+            case OLAP_FIELD_TYPE_OBJECT:
+                local.reset(new 
ScalarColumnVectorBatch<CppTypeTraits<OLAP_FIELD_TYPE_OBJECT>::CppType>(type_info,
 is_nullable));
+                break;
+            default:
+                return Status::NotSupported("unsupported type for 
ColumnVectorBatch: " + std::to_string(type_info->type()));
+        }
+        RETURN_IF_ERROR(local->resize(init_capacity));
+        *column_vector_batch = std::move(local);
+        return Status::OK();
+    } else {
+        switch (type_info->type()) {
+        case FieldType::OLAP_FIELD_TYPE_ARRAY: {
+            if (field == nullptr) {
+                return Status::NotSupported("When create 
ArrayColumnVectorBatch, `Field` is indispensable");
+            }
+            std::unique_ptr<ColumnVectorBatch> local(new 
ArrayColumnVectorBatch(type_info, is_nullable, init_capacity, field));
+            RETURN_IF_ERROR(local->resize(init_capacity));
+            *column_vector_batch = std::move(local);
+            return Status::OK();
+        }
+        default:
+            return Status::NotSupported("unsupported type for 
ColumnVectorBatch: " + std::to_string(type_info->type()));
+        }
+    }
+}
+
+template <class ScalarType>
+ScalarColumnVectorBatch<ScalarType>::ScalarColumnVectorBatch(const TypeInfo* 
type_info, bool is_nullable)
+: ColumnVectorBatch(type_info, is_nullable), _data(0) {
+}
+
+template <class ScalarType>
+ScalarColumnVectorBatch<ScalarType>::~ScalarColumnVectorBatch() = default;
+
+template <class ScalarType>
+Status ScalarColumnVectorBatch<ScalarType>::resize(size_t new_cap) {
+    if (capacity() < new_cap) { // before first init, _capacity is 0.
+        RETURN_IF_ERROR(ColumnVectorBatch::resize(new_cap));
+        _data.resize(new_cap);
+    }
+    return Status::OK();
+}
+
+ArrayColumnVectorBatch::ArrayColumnVectorBatch(
+        const TypeInfo* type_info,
+        bool is_nullable,
+        size_t init_capacity,
+        Field* field) : ColumnVectorBatch(type_info, is_nullable), _data(0), 
_item_offsets(1) {
+    auto array_type_info = reinterpret_cast<const ArrayTypeInfo*>(type_info);
+    _item_offsets[0] = 0;
+    ColumnVectorBatch::create(
+            init_capacity * 2,

Review comment:
       This is based on item's number is usually bigger than array's.




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