{"id":121901,"date":"2025-02-13T14:22:07","date_gmt":"2025-02-13T12:22:07","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/reliz-subd-duckdb-1-2-0"},"modified":"2025-02-13T14:22:07","modified_gmt":"2025-02-13T12:22:07","slug":"reliz-subd-duckdb-1-2-0","status":"publish","type":"post","link":"https:\/\/prohoster.info\/cs\/blog\/news\/reliz-subd-duckdb-1-2-0","title":{"rendered":"Vyd\u00e1n\u00ed datab\u00e1zov\u00e9ho syst\u00e9mu DuckDB 1.2.0","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Byla vyd\u00e1na verze datab\u00e1zov\u00e9ho syst\u00e9mu DuckDB 1.2.0, zam\u011b\u0159en\u00e1 na prov\u00e1d\u011bn\u00ed analytick\u00fdch dotaz\u016f a konceptu\u00e1ln\u011b p\u0159ipom\u00ednaj\u00edc\u00ed SQLite. DuckDB kombinuje vlastnosti SQLite, jako je kompaktnost, p\u0159ipojen\u00ed ve form\u011b vestav\u011bn\u00e9 knihovny, ukl\u00e1d\u00e1n\u00ed datab\u00e1ze do jednoho souboru a CLI rozhran\u00ed, s mo\u017enostmi a optimalizacemi pro prov\u00e1d\u011bn\u00ed analytick\u00fdch dotaz\u016f, kter\u00e9 zahrnuj\u00ed zna\u010dnou \u010d\u00e1st ulo\u017een\u00fdch dat, nap\u0159\u00edklad prov\u00e1d\u011bn\u00ed agregace ve\u0161ker\u00e9ho obsahu tabulek nebo slou\u010den\u00ed n\u011bkolika velk\u00fdch tabulek. K\u00f3d projektu je naps\u00e1n v jazyce C++ a je distribuov\u00e1n pod licenc\u00ed MIT.     <\/p>\n<p>DuckDB poskytuje roz\u0161\u00ed\u0159en\u00fd dialekt jazyka SQL, kter\u00fd zahrnuje dal\u0161\u00ed mo\u017enosti pro zpracov\u00e1n\u00ed velmi slo\u017eit\u00fdch a dlouho b\u011b\u017e\u00edc\u00edch dotaz\u016f. Je mo\u017en\u00e9 pou\u017e\u00edvat slo\u017eit\u00e9 typy (pole, struktury, unie), jako\u017e i vykon\u00e1vat libovoln\u00e9 a vno\u0159en\u00e9 korelovan\u00e9 poddotazy. Podporuje se sou\u010dasn\u00e9 prov\u00e1d\u011bn\u00ed n\u011bkolika dotaz\u016f a mo\u017enost spou\u0161t\u011bt dotazy p\u0159\u00edmo z soubor\u016f ve form\u00e1tech CSV a Parquet. Je dostupn\u00e1 podpora importu z datab\u00e1zov\u00e9ho syst\u00e9mu PostgreSQL.    <\/p>\n<p>Projekt vyu\u017e\u00edv\u00e1 shell ze SQLite, parser z PostgreSQL, komponentu Date Math z MonetDB, vlastn\u00ed implementaci okenn\u00edch funkc\u00ed (na z\u00e1klad\u011b algoritmu Segment Tree Aggregation), zpracovatele regul\u00e1rn\u00edch v\u00fdraz\u016f zalo\u017een\u00e9ho na knihovn\u011b RE2, vlastn\u00ed optimaliz\u00e1tor dotaz\u016f, MVCC mechanismus spr\u00e1vy sou\u010dasn\u00e9ho vykon\u00e1v\u00e1n\u00ed \u00faloh (Multi-Version Concurrency Control) a vektorov\u00fd engine pro vykon\u00e1v\u00e1n\u00ed dotaz\u016f na z\u00e1klad\u011b algoritmu Hyper-Pipelining Query Execution, kter\u00fd umo\u017e\u0148uje zpracov\u00e1vat velk\u00e9 sady hodnot v jednom kroku.    <\/p>\n<p>V nov\u00e9 verzi:  <\/p>\n<ul>\n<li class=\"l\"> Byla implementov\u00e1na podpora nov\u00fdch metod komprese, kter\u00e9 nejsou ve v\u00fdchoz\u00edm nastaven\u00ed zahrnuty pro zaji\u0161t\u011bn\u00ed kompatibility soubor\u016f datab\u00e1ze s p\u0159edchoz\u00edmi verzemi DuckDB. Pro pou\u017eit\u00ed vylep\u0161en\u00e9ho form\u00e1tu datab\u00e1zov\u00fdch soubor\u016f byla navr\u017eena mo\u017enost p\u0159ipojen\u00ed datab\u00e1ze k \u010d\u00edslu verze \u2014 p\u0159i otev\u0159en\u00ed souboru pomoc\u00ed parametru \u201eSTORAGE_VERSION\u201c nyn\u00ed lze zadat minim\u00e1ln\u011b podporovanou verzi datab\u00e1ze (\u2018ATTACH \u2018file.db\u2019 (STORAGE_VERSION \u2018v1.2.0\u2019);\u2019). Pro transformaci nov\u00e9ho form\u00e1tu na star\u00fd lze pou\u017e\u00edt SQL p\u0159\u00edkaz COPY, nap\u0159\u00edklad:       ATTACH \u2018file1.db\u2019;     ATTACH \u2018converted_file.db\u2019 (STORAGE_VERSION \u2018v1.0.0\u2019);     COPY FROM DATABASE file1 TO converted_file;\n<li class=\"l\"> Byla p\u0159id\u00e1na podpora SQL p\u0159\u00edkazu \u201eALTER TABLE \u2026 ADD PRIMARY KEY\u201c pro p\u0159id\u00e1n\u00ed prim\u00e1rn\u00edho kl\u00ed\u010de k existuj\u00edc\u00ed tabulce.\n<li class=\"l\"> Bylo odstran\u011bno omezen\u00ed, kter\u00e9 nedovolovalo znovu p\u0159id\u00e1vat identifik\u00e1tory, pro kter\u00e9 existuje index sledov\u00e1n\u00ed uniqueness, pokud byly dan\u00e9 identifik\u00e1tory odstran\u011bny v aktu\u00e1ln\u00ed transakci. Nap\u0159\u00edklad n\u00ed\u017ee uveden\u00fd SQL k\u00f3d nyn\u00ed nezp\u016fsobuje chybu:       CREATE TABLE students (id INTEGER PRIMARY KEY, name VARCHAR);     INSERT INTO students VALUES (1, \u2018John Doe\u2019);       BEGIN;        DELETE FROM students WHERE id = 1;        INSERT INTO students VALUES (1, \u2018Jane Doe\u2019);\n<li class=\"l\"> Byla p\u0159id\u00e1na podpora pro na\u010d\u00edt\u00e1n\u00ed CSV soubor\u016f v k\u00f3dov\u00e1n\u00ed Latin-1 a UTF-16 (d\u0159\u00edve bylo podporov\u00e1no pouze k\u00f3dov\u00e1n\u00ed UTF-8).       FROM read_csv(\u2018cities-latin-1.csv\u2019, encoding = \u2018latin-1\u2019);\n<li class=\"l\"> Byla p\u0159id\u00e1na podpora pou\u017e\u00edv\u00e1n\u00ed v\u00edcibajtov\u00fdch odd\u011blova\u010d\u016f v CSV souborech (a\u017e 4 bajty), co\u017e umo\u017e\u0148uje pou\u017e\u00edvat emoji jako odd\u011blova\u010d sloupc\u016f.         a\ud83c\udf54b     hello\ud83c\udf54world       FROM read_csv(\u2018example.dsv\u2019, sep = \u2018\ud83c\udf54\u2019);\n<li class=\"l\"> Ve v\u00fdchoz\u00edm nastaven\u00ed je zapnut\u00fd p\u0159\u00edsn\u00fd re\u017eim anal\u00fdzy CSV soubor\u016f (\u201estrict_mode = true\u201c), kter\u00fd kontroluje dodr\u017eov\u00e1n\u00ed form\u00e1tov\u00e1n\u00ed podle specifikace RFC 4180. V p\u0159\u00edsn\u00e9m re\u017eimu je povoleno pou\u017e\u00edvat pouze jeden znak pro odd\u011blen\u00ed \u0159\u00e1dk\u016f, co\u017e povede k chyb\u011b p\u0159i pokusu o anal\u00fdzu soubor\u016f, kde je pro odd\u011blen\u00ed \u0159\u00e1dk\u016f pou\u017e\u00edv\u00e1n nejen znak nov\u00e9ho \u0159\u00e1dku, ale i znak n\u00e1vratu voz\u00edku (\u2018\r\n\u2019).\n<li class=\"l\"> V parseru CSV byl zaveden nov\u00fd algoritmus pro ur\u010den\u00ed nov\u00e9ho \u0159\u00e1dku, kter\u00fd podporuje paraleln\u00ed operace. Pou\u017eit\u00ed nov\u00e9ho algoritmu urychlilo anal\u00fdzu CSV p\u0159ibli\u017en\u011b o 15%.\n<li class=\"l\"> Bylo odstran\u011bno omezen\u00ed na velikost \u0159\u00e1dku v CSV souborech (d\u0159\u00edve \u0159\u00e1dek nem\u011bl p\u0159ekro\u010dit 8 MB).\n<li class=\"l\"> P\u0159i exportu dat ve form\u00e1tu Parquet byla implementov\u00e1na podpora hash\u016f (slovn\u00edk\u016f) a filtr\u016f na z\u00e1klad\u011b Bloomova filtru. Byla implementov\u00e1na metoda komprese DELTA_BINARY_PACKED, kter\u00e1 umo\u017e\u0148uje zna\u010dn\u00e9 zmen\u0161en\u00ed velikosti Parquet soubor\u016f.\n<li class=\"l\"> Do rozhran\u00ed p\u0159\u00edkazov\u00e9ho \u0159\u00e1dku byl p\u0159id\u00e1n bezpe\u010dn\u00fd re\u017eim, kter\u00fd lze aktivovat pomoc\u00ed mo\u017enosti \u201e-safe\u201c nebo p\u0159\u00edkazu \u201e.safe_mode\u201c. V tomto re\u017eimu je povolen p\u0159\u00edstup pouze k p\u016fvodn\u011b uveden\u00e9mu souboru datab\u00e1ze, a pokus o otev\u0159en\u00ed jin\u00fdch soubor\u016f povede k chybov\u00e9mu hl\u00e1\u0161en\u00ed.\n<li class=\"l\"> V rozhran\u00ed p\u0159\u00edkazov\u00e9ho \u0159\u00e1dku bylo vylep\u0161eno automatick\u00e9 dopl\u0148ov\u00e1n\u00ed vstupu. K\u00f3d pro automatick\u00e9 dopl\u0148ov\u00e1n\u00ed byl p\u0159eveden na pou\u017eit\u00ed PEG (parsing expression grammar).\n<li class=\"l\"> P\u0159i prov\u00e1d\u011bn\u00ed p\u0159\u00edkaz\u016f v rozhran\u00ed p\u0159\u00edkazov\u00e9ho \u0159\u00e1dku je realizov\u00e1no n\u00e1zorn\u00e9 zobrazen\u00ed velk\u00fdch \u010d\u00edsel, nap\u0159\u00edklad p\u0159i zobrazen\u00ed \u010d\u00edsla 100000000 bude nav\u00edc p\u0159ips\u00e1no &#171;(100 milion\u016f)&#187;.\n<li class=\"l\"> V SQL byla p\u0159id\u00e1na podpora syntaxe, kter\u00e1 umo\u017e\u0148uje uv\u00e1d\u011bt zkr\u00e1cen\u00e9 n\u00e1zvy tabulek a v\u00fdraz\u016f a\u017e do hodnot, na kter\u00e9 odkazuj\u00ed (nam\u00edsto pou\u017eit\u00ed syntaxe &#171;v\u00fdraz AS n\u00e1zev&#187;): SELECT e1: some_long_and_winding_expression, e2: t2.a_column_name FROM t1: long_schema.some_long_table_name, t2: short_s.tbl;\n<li class=\"l\"> V p\u0159\u00edkazu &#171;SELECT&#187; byla zavedena podpora operace &#171;RENAME&#187; pro p\u0159ejmenov\u00e1n\u00ed pol\u00ed, kter\u00e1 se zobrazuj\u00ed p\u0159i uveden\u00ed v\u00fdrazu &#171;*&#187;: SELECT * RENAME (col1 AS new_col1) FROM integers;\n<li class=\"l\"> V p\u0159\u00edkazu &#171;SELECT&#187; je povoleno pou\u017eit\u00ed operac\u00ed &#171;LIKE&#187; a &#171;SIMILAR TO&#187; p\u0159i v\u00fdstupu p\u0159es &#171;*&#187;: SELECT * LIKE &#8216;val%&#8217; FROM key_val;\n<li class=\"l\"> Byla zv\u00fd\u0161ena kvalita generov\u00e1n\u00ed pseudon\u00e1hodn\u00fdch \u010d\u00edsel.\n<li class=\"l\"> Byl modernizov\u00e1n optimaliz\u00e1tor dotaz\u016f. V\u00fdkon p\u0159i pr\u016fchodu testem TPC-H SF100 se zv\u00fd\u0161il o 13 %.\n<li class=\"l\"> Byl navr\u017een nov\u00fd API podobn\u00fd C pro v\u00fdvoj dopl\u0148k\u016f, kter\u00fd lze pou\u017e\u00edt nap\u0159\u00edklad k vytv\u00e1\u0159en\u00ed nov\u00fdch agrega\u010dn\u00edch nebo tabulkov\u00fdch funkc\u00ed.\n<li class=\"l\"> Byla p\u0159id\u00e1na podpora syst\u00e9m\u016f se standardn\u00ed knihovnou C Musl.          <\/ul>\n<p>Zdroj: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=62712\">opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u041e\u043f\u0443\u0431\u043b\u0438\u043a\u043e\u0432\u0430\u043d \u0432\u044b\u043f\u0443\u0441\u043a \u0421\u0423\u0411\u0414 DuckDB 1.2.0, \u043e\u0440\u0438\u0435\u043d\u0442\u0438\u0440\u043e\u0432\u0430\u043d\u043d\u043e\u0439 \u043d\u0430 \u0432\u044b\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u0435 \u0430\u043d\u0430\u043b\u0438\u0442\u0438\u0447\u0435\u0441\u043a\u0438\u0445 \u0437\u0430\u043f\u0440\u043e\u0441\u043e\u0432 \u0438 \u043a\u043e\u043d\u0446\u0435\u043f\u0442\u0443\u0430\u043b\u044c\u043d\u043e \u043d\u0430\u043f\u043e\u043c\u0438\u043d\u0430\u044e\u0449\u0435\u0439 SQLite. DuckDB \u0441\u043e\u0447\u0435\u0442\u0430\u0435\u0442 \u0442\u0430\u043a\u0438\u0435 \u0441\u0432\u043e\u0439\u0441\u0442\u0432\u0430 SQLite, \u043a\u0430\u043a \u043a\u043e\u043c\u043f\u0430\u043a\u0442\u043d\u043e\u0441\u0442\u044c, \u043f\u043e\u0434\u043a\u043b\u044e\u0447\u0435\u043d\u0438\u0435 \u0432 \u0444\u043e\u0440\u043c\u0435 \u0432\u0441\u0442\u0440\u0430\u0438\u0432\u0430\u0435\u043c\u043e\u0439 \u0431\u0438\u0431\u043b\u0438\u043e\u0442\u0435\u043a\u0438, \u0445\u0440\u0430\u043d\u0435\u043d\u0438\u0435 \u0411\u0414 \u0432 \u043e\u0434\u043d\u043e\u043c \u0444\u0430\u0439\u043b\u0435 \u0438 CLI-\u0438\u043d\u0442\u0435\u0440\u0444\u0435\u0439\u0441, \u0441 \u0432\u043e\u0437\u043c\u043e\u0436\u043d\u043e\u0441\u0442\u044f\u043c\u0438 \u0438 \u043e\u043f\u0442\u0438\u043c\u0438\u0437\u0430\u0446\u0438\u044f\u043c\u0438 \u0434\u043b\u044f \u0432\u044b\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u044f \u0430\u043d\u0430\u043b\u0438\u0442\u0438\u0447\u0435\u0441\u043a\u0438\u0445 \u0437\u0430\u043f\u0440\u043e\u0441\u043e\u0432, \u043e\u0445\u0432\u0430\u0442\u044b\u0432\u0430\u044e\u0449\u0438\u0445 \u0437\u043d\u0430\u0447\u0438\u0442\u0435\u043b\u044c\u043d\u0443\u044e \u0447\u0430\u0441\u0442\u044c \u0445\u0440\u0430\u043d\u0438\u043c\u044b\u0445 \u0434\u0430\u043d\u043d\u044b\u0445, \u043d\u0430\u043f\u0440\u0438\u043c\u0435\u0440, \u0432\u044b\u043f\u043e\u043b\u043d\u044f\u044e\u0449\u0438\u0445 \u0430\u0433\u0440\u0435\u0433\u0438\u0440\u043e\u0432\u0430\u043d\u0438\u0435 \u0432\u0441\u0435\u0433\u043e \u0441\u043e\u0434\u0435\u0440\u0436\u0438\u043c\u043e\u0433\u043e \u0442\u0430\u0431\u043b\u0438\u0446 \u0438\u043b\u0438 \u0441\u043b\u0438\u044f\u043d\u0438\u0435 \u043d\u0435\u0441\u043a\u043e\u043b\u044c\u043a\u0438\u0445 [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-121901","post","type-post","status-publish","format-standard","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.3 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u041e\u043f\u0443\u0431\u043b\u0438\u043a\u043e\u0432\u0430\u043d \u0432\u044b\u043f\u0443\u0441\u043a \u0421\u0423\u0411\u0414 DuckDB 1.2.0, \u043e\u0440\u0438\u0435\u043d\u0442\u0438\u0440\u043e\u0432\u0430\u043d\u043d\u043e\u0439 \u043d\u0430 \u0432\u044b\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u0435 \u0430\u043d\u0430\u043b\u0438\u0442\u0438\u0447\u0435\u0441\u043a\u0438\u0445 \u0437\u0430\u043f\u0440\u043e\u0441\u043e\u0432 \u0438 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