for (JOIN_TAB **pos = best_ref + const_tables; *pos; pos++) { 一、遍历每张出现的表,寻找表里已经创建的索引。 二、判断表有join条件的情况,本次不涉及 三、判断表有表依赖的情况,本次不涉及 四、检查表是否可以通过key读取或表仅使用 const ref。 这里需要排除以下表: 1. 全文搜索,或 2. 嵌套...
} while ((const_table_map & found_ref) && ref_changed);以下是实际使用的时候表扫描方式类型汇总,其中JT_CONST和JT_SYSTEM就是我们本章要说明的。JT_SYSTEM类型,这个需要跟JT_CONST区分开,JT_SYSTEM主要是扩展表而不是物理表,JT_SYSTEM表没有索引。JT_SYSTEM类型也会被计入const_tables,详情见下面。join...
boolJOIN::make_join_plan(){if(!(query_block->active_options()&OPTION_NO_CONST_TABLES)){// Detect tables that are const (0 or 1 row) and read their contents.//根据表的统计信息table->file->stats.records直接寻找该值为0或者1的表,并且表的cached_table_flags必须为HA_STATS_RECORDS_IS_EXACT...
const Wrapper = ({children, active}: any) => { const resolveRef = useRef(); if (active) { resolveRef.current && resolveRef.current(); resolveRef.current = null; } else { throw new Promise((resolve) => { resolveRef.current = resolve; }) } return children; } const OffscreenKeepAli...
if (active) { resolveRef.current && resolveRef.current(); resolveRef.current = null; } else { throw new Promise((resolve) => { resolveRef.current = resolve; }) } return children; } const OffscreenKeepAlive = ({children, active}: any) => { ...
refhttps://dev.to/xflywind/wrap-const-char-in-the-nim-language-53no juancarlospaco, hamidb80, and xigoi reacted with thumbs up emoji 👍 Sorry, something went wrong. Copy link Collaborator juancarlospacocommentedMar 21, 2022 Maybe that@xflywindexamples can be in the official documentation ...
IXAPO::AddRef method (Windows) IActiveBasicDevice::IsMuteSupported method (Windows) ModemDMConfigProfile (Windows) ITransformPropertiesConfig::RemovePropertyByName AuthProtocol (Windows) TestCaseKey element (Windows) DeviceController.RemoveDevice method (Windows) Special-Purpose Command-line Options for ...
CCscSearchApiInterface::DelRef method (Windows) DDWM_UPDATEWINDOW message (Windows) DWordToPtrdiffT function (Windows) IStorage::RemoteEnumElements method (Windows) InterlockedCompareExchangePointerAcquire function (Windows) InterlockedXorRelease function (Windows) IntPtrToSIZET function (Windows) IShellTask...
(e, 0)} + dangerouslySetInnerHTML={{ __html: footer.name }}> + )} ); }; //左边组件 -const Assembly: React.FC<{ onDragStart: (parameter: string) => void }> = ({ - onDragStart, -}) => { +const Assembly: React.FC<{ + onDragStart: (parameter: string) => void; +}>...
Appliactive functors were originally named idom by McBride and Paterson, so Gibbons uses the term idiomatic interchangably with applicative througout this paper, even though McBride and Paterson renamed it to applicative functors. Monoidal applicative functors using Const datatype ...