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<dt style="clear: both; float: left; font-weight: bold; width: 8em">Author</dt>
<dd style="margin-left: 8.5em">susumu.yata <susum****@gmail*****></dd>
<dt style="clear: both; float: left; font-weight: bold; width: 8em">Date</dt>
<dd style="margin-left: 8.5em">2015-10-14 17:35:49 +0900 (Wed, 14 Oct 2015)</dd>
<dt style="clear: both; float: left; font-weight: bold; width: 8em">New Revision</dt>
<dd style="margin-left: 8.5em"><a href="https://github.com/groonga/groonga.org/commit/b2118147028bb4fb63a3a7fb13f3092f30801ed6">b2118147028bb4fb63a3a7fb13f3092f30801ed6</a></dd>
<dt style="clear: both; float: left; font-weight: bold; width: 8em">Message</dt>
<dd style="margin-left: 8.5em"><pre style="border: 1px solid #aaa; font-family: Consolas, Menlo, "Liberation Mono", Courier, monospace; line-height: 1.2; padding: 0.5em; width: auto">Put a draft of a blog article that introduces grn_ts</pre></dd>
<dt style="clear: both; float: left; font-weight: bold; width: 8em">Added files</dt>
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<li><a href="https://github.com/groonga/groonga.org/commit/b2118147028bb4fb63a3a7fb13f3092f30801ed6#diff-c9aa94b8f298a8c7669fb009cfefd2fb">ja/_posts/2015-10-15-grn_ts.md</a></li>
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<pre style="border: 0; font-family: Consolas, Menlo, "Liberation Mono", Courier, monospace; line-height: 1.2; margin: 0; padding: 0.5em; white-space: normal; width: auto"><span class="diff-line-number-hunk-header" style="display: block; white-space: pre"><a href="https://github.com/groonga/groonga.org/commit/b2118147028bb4fb63a3a7fb13f3092f30801ed6#diff-c9aa94b8f298a8c7669fb009cfefd2fb">...</a></span>
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<span class="diff-line-number-added" style="background-color: #dbffdb; color: #000000; display: block; white-space: pre"><a href="https://github.com/groonga/groonga.org/commit/b2118147028bb4fb63a3a7fb13f3092f30801ed6#diff-c9aa94b8f298a8c7669fb009cfefd2fbR77">77</a></span>
<span class="diff-line-number-added" style="background-color: #dbffdb; color: #000000; display: block; white-space: pre"><a href="https://github.com/groonga/groonga.org/commit/b2118147028bb4fb63a3a7fb13f3092f30801ed6#diff-c9aa94b8f298a8c7669fb009cfefd2fbR78">78</a></span>
<span class="diff-line-number-added" style="background-color: #dbffdb; color: #000000; display: block; white-space: pre"><a href="https://github.com/groonga/groonga.org/commit/b2118147028bb4fb63a3a7fb13f3092f30801ed6#diff-c9aa94b8f298a8c7669fb009cfefd2fbR79">79</a></span>
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<span class="diff-line-number-added" style="background-color: #dbffdb; color: #000000; display: block; white-space: pre"><a href="https://github.com/groonga/groonga.org/commit/b2118147028bb4fb63a3a7fb13f3092f30801ed6#diff-c9aa94b8f298a8c7669fb009cfefd2fbR81">81</a></span>
</pre>
</th>
<td class="diff-content" style="border: 1px solid #aaa">
<pre style="border: 0; font-family: Consolas, Menlo, "Liberation Mono", Courier, monospace; line-height: 1.2; margin: 0; padding: 0.5em; white-space: normal; width: auto"><span class="diff-hunk-header" style="background-color: #eaf2f5; color: #999999; display: block; white-space: pre">@@ -0,0 +1,81 @@</span>
<span class="diff-added" style="background-color: #dbffdb; color: #000000; display: block; white-space: pre">+---</span>
<span class="diff-added" style="background-color: #dbffdb; color: #000000; display: block; white-space: pre">+layout: post.ja</span>
<span class="diff-added" style="background-color: #dbffdb; color: #000000; display: block; white-space: pre">+title: grn_ts （ぐるんたす）の紹介</span>
<span class="diff-added" style="background-color: #dbffdb; color: #000000; display: block; white-space: pre">+description: grn_ts を紹介します！</span>
<span class="diff-added" style="background-color: #dbffdb; color: #000000; display: block; white-space: pre">+published: false</span>
<span class="diff-added" style="background-color: #dbffdb; color: #000000; display: block; white-space: pre">+---</span>
<span class="diff-added" style="background-color: #dbffdb; color: #000000; display: block; white-space: pre">+</span>
<span class="diff-added" style="background-color: #dbffdb; color: #000000; display: block; white-space: pre">+## grn_ts （ぐるんたす）の紹介</span>
<span class="diff-added" style="background-color: #dbffdb; color: #000000; display: block; white-space: pre">+</span>
<span class="diff-added" style="background-color: #dbffdb; color: #000000; display: block; white-space: pre">+Groonga の実験的な機能として， `select` の新しい内部エンジン grn_ts が追加されています． grn_ts の TS は Turbo Selector の略であり，まだ使えない機能がたくさんあるものの，単純なフィルタリングをおこなうだけであれば，従来エンジンより高速に動作します．以下, grn_ts の特徴や使い方を簡単に紹介します．</span>
<span class="diff-added" style="background-color: #dbffdb; color: #000000; display: block; white-space: pre">+</span>
<span class="diff-added" style="background-color: #dbffdb; color: #000000; display: block; white-space: pre">+### 特徴</span>
<span class="diff-added" style="background-color: #dbffdb; color: #000000; display: block; white-space: pre">+</span>
<span class="diff-added" style="background-color: #dbffdb; color: #000000; display: block; white-space: pre">+grn_ts は Groonga が列指向なデータベースであることを強く意識した実装となっているため，特にカラムの走査が高速です． 擬似乱数を保存した 10 列 x 100 万行のテーブルを使った実験では，索引を使わない検索速度が従来エンジンと比べて **約 10 倍** になることが確認されています．</span>
<span class="diff-added" style="background-color: #dbffdb; color: #000000; display: block; white-space: pre">+</span>
<span class="diff-added" style="background-color: #dbffdb; color: #000000; display: block; white-space: pre">+高速な検索以外の特徴として， `output_columns` に式を記述することができます．たとえば， `--output_columns '_id, _key, ColA + ColB'` と記述すれば， `_id`, `_key` に加えて `ColA + ColB` を評価した結果が出力されます．</span>
<span class="diff-added" style="background-color: #dbffdb; color: #000000; display: block; white-space: pre">+</span>
<span class="diff-added" style="background-color: #dbffdb; color: #000000; display: block; white-space: pre">+### 有効にする方法</span>
<span class="diff-added" style="background-color: #dbffdb; color: #000000; display: block; white-space: pre">+</span>
<span class="diff-added" style="background-color: #dbffdb; color: #000000; display: block; white-space: pre">+grn_ts はまだ実験的な機能であり，デフォルトでは有効になっていません． grn_ts を有効化するには， `configure` スクリプトを実行するとき，以下のように指定してください． `GRN_WITH_TS` というマクロが定義され， grn_ts が有効になります．</span>
<span class="diff-added" style="background-color: #dbffdb; color: #000000; display: block; white-space: pre">+</span>
<span class="diff-added" style="background-color: #dbffdb; color: #000000; display: block; white-space: pre">+```</span>
<span class="diff-added" style="background-color: #dbffdb; color: #000000; display: block; white-space: pre">+$ ./configure CFLAGS="-g -O2 -DGRN_WITH_TS"</span>
<span class="diff-added" style="background-color: #dbffdb; color: #000000; display: block; white-space: pre">+```</span>
<span class="diff-added" style="background-color: #dbffdb; color: #000000; display: block; white-space: pre">+</span>
<span class="diff-added" style="background-color: #dbffdb; color: #000000; display: block; white-space: pre">+現在は Ubuntu 14.04 で開発を進めているため，ほかの環境ではビルドに失敗したり，動作がおかしくなったりする可能性があります．問題が見つかったときは， [GitHub Issues](https://github.com/groonga/groonga/issues) や [メーリングリスト](http://lists.osdn.me/mailman/listinfo/groonga-dev) よりご連絡ください．</span>
<span class="diff-added" style="background-color: #dbffdb; color: #000000; display: block; white-space: pre">+</span>
<span class="diff-added" style="background-color: #dbffdb; color: #000000; display: block; white-space: pre">+### 使い方</span>
<span class="diff-added" style="background-color: #dbffdb; color: #000000; display: block; white-space: pre">+</span>
<span class="diff-added" style="background-color: #dbffdb; color: #000000; display: block; white-space: pre">+`select` の `filter` を指定するとき，先頭に `?` を追加すれば grn_ts が適用されます．以下に例を示します．以下の例において， `Table` は擬似乱数を保存した 10 列 x 100 万行のテーブルです．従来エンジンと grn_ts の検索時間を比較すると， grn_ts では約 1/10 に短縮されていることがわかります．</span>
<span class="diff-added" style="background-color: #dbffdb; color: #000000; display: block; white-space: pre">+</span>
<span class="diff-added" style="background-color: #dbffdb; color: #000000; display: block; white-space: pre">+```</span>
<span class="diff-added" style="background-color: #dbffdb; color: #000000; display: block; white-space: pre">+> # 従来エンジン</span>
<span class="diff-added" style="background-color: #dbffdb; color: #000000; display: block; white-space: pre">+> select Table --filter 'Col0 < 50' --output_columns '_id, Col0'</span>
<span class="diff-added" style="background-color: #dbffdb; color: #000000; display: block; white-space: pre">+[[0,1444290905.65602,0.2112135887146],</span>
<span class="diff-added" style="background-color: #dbffdb; color: #000000; display: block; white-space: pre">+ [[[499510],</span>
<span class="diff-added" style="background-color: #dbffdb; color: #000000; display: block; white-space: pre">+ [["_id","UInt32"],["Col0","Int64"]],</span>
<span class="diff-added" style="background-color: #dbffdb; color: #000000; display: block; white-space: pre">+ [4,41],[5,13],[9,23],[11,25],[13,26],[15,24],[16,40],[19,30],[21,29],[24,20]]]]</span>
<span class="diff-added" style="background-color: #dbffdb; color: #000000; display: block; white-space: pre">+</span>
<span class="diff-added" style="background-color: #dbffdb; color: #000000; display: block; white-space: pre">+> # grn_ts</span>
<span class="diff-added" style="background-color: #dbffdb; color: #000000; display: block; white-space: pre">+> select Table --filter '?Col0 < 50' --output_columns '_id, Col0'</span>
<span class="diff-added" style="background-color: #dbffdb; color: #000000; display: block; white-space: pre">+[[0,1444290923.81565,0.0201132297515869],</span>
<span class="diff-added" style="background-color: #dbffdb; color: #000000; display: block; white-space: pre">+ [[[499510],</span>
<span class="diff-added" style="background-color: #dbffdb; color: #000000; display: block; white-space: pre">+ [["_id","UInt32"],["Col0","Int64"]],</span>
<span class="diff-added" style="background-color: #dbffdb; color: #000000; display: block; white-space: pre">+ [4,41],[5,13],[9,23],[11,25],[13,26],[15,24],[16,40],[19,30],[21,29],[24,20]]]]</span>
<span class="diff-added" style="background-color: #dbffdb; color: #000000; display: block; white-space: pre">+```</span>
<span class="diff-added" style="background-color: #dbffdb; color: #000000; display: block; white-space: pre">+</span>
<span class="diff-added" style="background-color: #dbffdb; color: #000000; display: block; white-space: pre">+次に `output_columns` に式を記述した `select` の例を示します．従来であればカラム名が出力されるところには，式がそのまま出力されています．</span>
<span class="diff-added" style="background-color: #dbffdb; color: #000000; display: block; white-space: pre">+</span>
<span class="diff-added" style="background-color: #dbffdb; color: #000000; display: block; white-space: pre">+```</span>
<span class="diff-added" style="background-color: #dbffdb; color: #000000; display: block; white-space: pre">+> select Table --filter '?Col0 + Col1 < 100 ' --output_columns '_id, Col0, Col1, Col0 + Col1'</span>
<span class="diff-added" style="background-color: #dbffdb; color: #000000; display: block; white-space: pre">+[[0,1444291081.77697,0.0250604152679443],</span>
<span class="diff-added" style="background-color: #dbffdb; color: #000000; display: block; white-space: pre">+ [[[505001],</span>
<span class="diff-added" style="background-color: #dbffdb; color: #000000; display: block; white-space: pre">+ [["_id","UInt32"],["Col0","Int64"],["Col1","Int64"],["Col0 + Col1","Int64"]],</span>
<span class="diff-added" style="background-color: #dbffdb; color: #000000; display: block; white-space: pre">+ [4,41,8,49],[6,57,21,78],[7,51,10,61],[9,23,53,76],[11,25,51,76],</span>
<span class="diff-added" style="background-color: #dbffdb; color: #000000; display: block; white-space: pre">+ [13,26,2,28],[15,24,47,71],[16,40,51,91],[17,67,31,98],[18,66,10,76]]]]</span>
<span class="diff-added" style="background-color: #dbffdb; color: #000000; display: block; white-space: pre">+```</span>
<span class="diff-added" style="background-color: #dbffdb; color: #000000; display: block; white-space: pre">+</span>
<span class="diff-added" style="background-color: #dbffdb; color: #000000; display: block; white-space: pre">+※ 見やすくするため，検索結果には改行を挿入しています．</span>
<span class="diff-added" style="background-color: #dbffdb; color: #000000; display: block; white-space: pre">+</span>
<span class="diff-added" style="background-color: #dbffdb; color: #000000; display: block; white-space: pre">+### 制限事項</span>
<span class="diff-added" style="background-color: #dbffdb; color: #000000; display: block; white-space: pre">+</span>
<span class="diff-added" style="background-color: #dbffdb; color: #000000; display: block; white-space: pre">+現在， grn_ts で使える `select` のオプションは以下の通りです．</span>
<span class="diff-added" style="background-color: #dbffdb; color: #000000; display: block; white-space: pre">+</span>
<span class="diff-added" style="background-color: #dbffdb; color: #000000; display: block; white-space: pre">+- `filter`</span>
<span class="diff-added" style="background-color: #dbffdb; color: #000000; display: block; white-space: pre">+- `output_columns`</span>
<span class="diff-added" style="background-color: #dbffdb; color: #000000; display: block; white-space: pre">+- `offset`</span>
<span class="diff-added" style="background-color: #dbffdb; color: #000000; display: block; white-space: pre">+- `limit`</span>
<span class="diff-added" style="background-color: #dbffdb; color: #000000; display: block; white-space: pre">+</span>
<span class="diff-added" style="background-color: #dbffdb; color: #000000; display: block; white-space: pre">+ただし，関数や索引が使えなかったり，テーブル参照が暗黙的に解決されなかったり，一部の演算子に対応していなかったりという制限があります．具体的な制限については，日々更新されていくため，ここでは省略させていただきます．</span>
<span class="diff-added" style="background-color: #dbffdb; color: #000000; display: block; white-space: pre">+</span>
<span class="diff-added" style="background-color: #dbffdb; color: #000000; display: block; white-space: pre">+### 今後</span>
<span class="diff-added" style="background-color: #dbffdb; color: #000000; display: block; white-space: pre">+</span>
<span class="diff-added" style="background-color: #dbffdb; color: #000000; display: block; white-space: pre">+今後の課題として大きなものを挙げると以下のようになります．</span>
<span class="diff-added" style="background-color: #dbffdb; color: #000000; display: block; white-space: pre">+</span>
<span class="diff-added" style="background-color: #dbffdb; color: #000000; display: block; white-space: pre">+- 整列</span>
<span class="diff-added" style="background-color: #dbffdb; color: #000000; display: block; white-space: pre">+- 索引</span>
<span class="diff-added" style="background-color: #dbffdb; color: #000000; display: block; white-space: pre">+- 全文検索</span>
<span class="diff-added" style="background-color: #dbffdb; color: #000000; display: block; white-space: pre">+- ドリルダウン</span>
<span class="diff-added" style="background-color: #dbffdb; color: #000000; display: block; white-space: pre">+</span>
<span class="diff-added" style="background-color: #dbffdb; color: #000000; display: block; white-space: pre">+近い内に，どの機能から実装を進めて欲しいかを尋ねるアンケートをさせていただくかもしれません．</span>
</pre>
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