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What is the difference between partitioning and bucketing a table in Hive ?
...reflecting the partitioning structure like
.../employees/country=ABC/DEPT=XYZ.
If query limits for employee from country=ABC, it will only scan the contents of one directory country=ABC. This can dramatically improve query performance, but only if the partitioning scheme reflects common filterin...
When should static_cast, dynamic_cast, const_cast and reinterpret_cast be used?
...gLog::OnMessage(Message *msg)
{
static DebugMsgData *debug;
static XYZMsgData *xyz;
if(debug = dynamic_cast<DebugMsgData*>(msg->pdata)){
// debug message
}
else if(xyz = dynamic_cast<XYZMsgData*>(msg->pdata)){
// xyz message
}
else/* if(...
Connection to SQL Server Works Sometimes
...f 30 seconds into the connection string eg:
ConnectionString="Data Source=xyz;Initial Catalog=xyz;Integrated Security=True;Connection Timeout=30;"
In my situation the only affected connection was one that was using integrated Security and I was impersonating a user before connecting, other connec...
Load different colorscheme when using vimdiff
...n) or use an autocommand:
au FilterWritePre * if &diff | colorscheme xyz | endif
FilterWritePre is called before filtering through an external program (the diff utility) and the &diff-option is set by vim when it's going into diff-mode (among others, see :help diff)
I'm not sure which au...
正则表达式 30 分钟入门教程 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...?。如果你想查找某个目录下的所有的Word文档的话，你会搜索*.doc。在这里，*会被解释成任意的字符串。和通配符类似，正则表达式也是用来进行文本匹配的工具，只不过比起通配符，它能更精确地描述你的需求——当然，代价...
用户界面（UI）组件 · App Inventor 2 中文网
...序设计”视图中设置元素属性，是一个列表属性。
显示搜索框属性设置为 真，将生成可搜索列表，其他属性影响按钮的外观 (文本对齐,
背景颜色等) 以及是否可以被点击（启用）。
属性
背景颜色
设置列表选择器的背景...
What package naming convention do you use for personal/hobby projects in Java?
...
So If I want to address the package name as com.xyz should this package name be registered somewhere?? P.S. xyz is my client.
– Prasad
Dec 29 '14 at 10:02
...
Not equal != operator on NULL
... the column. Also, a SELECT statement that uses WHERE column_name <> XYZ_value returns all rows that are not XYZ_value and that are not NULL. IMHO, this last statement seems a little odd in it's exclusion of nulls from the results!
– DarthPablo
Jun 23 '14...
Dynamically select data frame columns using $ and a character value
... in loop as well
reverse way to add dynamic name eg if A is data frame and xyz is column to be named as x then I do like this
A$tmp=xyz
colnames(A)[colnames(A)=="tmp"]=x
again this can also be added in loop
share
...
Send Email Intent
...ew Intent(Intent.ACTION_SENDTO);
emailIntent.setData(Uri.parse("mailto:abc@xyz.com"));
startActivity(Intent.createChooser(emailIntent, "Send feedback"));
Kotlin version
val emailIntent = Intent(Intent.ACTION_SENDTO).apply {
data = Uri.parse("mailto:abc@xyz.com")
}
startActivity(Intent.createC...