[GitHub] [incubator-doris] imay commented on a change in pull request #1282: Add OrdinalPageIndex and EncodingInfo

[GitBox <gi...@apache.org>]

imay commented on a change in pull request #1282: Add OrdinalPageIndex and EncodingInfo
URL: https://github.com/apache/incubator-doris/pull/1282#discussion_r292720367
 
 

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 File path: be/src/olap/rowset/segment_v2/encoding_info.cpp
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 @@ -0,0 +1,131 @@
+// 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 "olap/rowset/segment_v2/encoding_info.h"
+
+#include "olap/olap_common.h"
+
+namespace doris {
+namespace segment_v2 {
+
+struct EncodingMapHash {
+    size_t operator()(const std::pair<FieldType, EncodingTypePB>& pair) const {
+        return (pair.first << 5) ^ pair.second;
+    }
+};
+
+template<FieldType type, EncodingTypePB encoding>
+struct TypeEncodingTraits { };
+
+template<FieldType type>
+struct TypeEncodingTraits<type, PLAIN_ENCODING> {
+    static Status create_page_builder(PageBuilder** builder) {
+        return Status::OK;
+    }
+    static Status create_page_decoder(PageDecoder** decoder) {
+        return Status::OK;
+    }
+};
+
+class EncodingInfoResolver {
+public:
+    EncodingInfoResolver();
+    ~EncodingInfoResolver();
+
+    EncodingTypePB get_default_encoding_type(FieldType type) const {
+        auto it = _default_encoding_type_map.find(type);
+        if (it != std::end(_default_encoding_type_map)) {
+            return it->second;
+        }
+        return DEFAULT_ENCODING;
+    }
+
+    Status get(FieldType data_type, EncodingTypePB encoding_type, const EncodingInfo** out);
+
+private:
+    template<FieldType type, EncodingTypePB encoding_type>
+    void _add_map() {
+        TypeEncodingTraits<type, encoding_type> traits;
+        std::unique_ptr<EncodingInfo> encoding(new EncodingInfo(traits));
+        if (_default_encoding_type_map.find(type) == std::end(_default_encoding_type_map)) {
+            _default_encoding_type_map[type] = encoding_type;
+        }
+        auto key = std::make_pair(type, encoding_type);
+        _encoding_map.emplace(key, encoding.release());
+    }
+
+    std::unordered_map<FieldType, EncodingTypePB, std::hash<int>> _default_encoding_type_map;
+
+    std::unordered_map<std::pair<FieldType, EncodingTypePB>,
+        EncodingInfo*, EncodingMapHash> _encoding_map;
+};
+
+EncodingInfoResolver::EncodingInfoResolver() {
+    _add_map<OLAP_FIELD_TYPE_TINYINT, PLAIN_ENCODING>();
+    _add_map<OLAP_FIELD_TYPE_SMALLINT, PLAIN_ENCODING>();
+    _add_map<OLAP_FIELD_TYPE_INT, PLAIN_ENCODING>();
+    _add_map<OLAP_FIELD_TYPE_BIGINT, PLAIN_ENCODING>();
+    _add_map<OLAP_FIELD_TYPE_LARGEINT, PLAIN_ENCODING>();
+    _add_map<OLAP_FIELD_TYPE_FLOAT, PLAIN_ENCODING>();
+    _add_map<OLAP_FIELD_TYPE_DOUBLE, PLAIN_ENCODING>();
 
 Review comment:
   Yes, this is temporary 

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