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Difference between partition key, composite key and clustering key in Cassandra?
...y in the order they're set.
so the valid queries are (excluding secondary indexes)
col1 and col2
col1 and col2 and col10
col1 and col2 and col10 and col 4
Invalid:
col1 and col2 and col4
anything that does not contain both col1 and col2
Hope this helps.
...
HashSet vs. List performance
... List potentially might calculate offset for the specific element by it's index (because all elements are the same type and potentially occupy same memory size). So List is not necessary enumerates it's elements
– Lu55
Oct 21 '14 at 11:54
...
How do I Sort a Multidimensional Array in PHP [duplicate]
...
foreach ($mdarray as $key => $row) {
// replace 0 with the field's index/key
$dates[$key] = $row[0];
}
array_multisort($dates, SORT_DESC, $mdarray);
For PHP >= 5.5.0 just extract the column to sort by. No need for the loop:
array_multisort(array_column($mdarray, 0), SORT_DESC, $...
TypeScript Objects as Dictionary types as in C#
... That's a useful way to make sure that the compiler restricts indexes to strings. Interesting. Doesn't look like you can specify the index type to be anything other than strings or integers, but that makes sense, since it just maps to the native JS object indexes.
–...
WAMP 403 Forbidden message on Windows 7
...onf (Apache's config file) :
<Directory "c:/wamp/www/">
Options Indexes FollowSymLinks
AllowOverride all
Order Deny,Allow
Deny from all
Allow from 127.0.0.1
</Directory>
The same goes for your PHPMyAdmin access, the config file is phpmyadmin.conf :
<Directory "...
Elegant solution to duplicate, const and non-const, getters? [duplicate]
...bout:
template<typename IN, typename OUT>
OUT BigChunk(IN self, int index) {
// big, non-trivial chunk of code...
return something;
}
struct FooBar {
Something &getSomething(int index) {
return BigChunk<FooBar*, Something&>(this,index);
}
const Some...
Remove the last three characters from a string
...ly asked question]
You can use string.Substring and give it the starting index and it will get the substring starting from given index till end.
myString.Substring(myString.Length-3)
Retrieves a substring from this instance. The substring starts at a
specified character position. MSDN
E...
How do I undo 'git add' before commit?
... commit with
git reset <file>
which will remove it from the current index (the "about to be committed" list) without changing anything else.
You can use
git reset
without any file name to unstage all due changes. This can come in handy when there are too many files to be listed one by one in...
ALTER TABLE without locking the table?
.../O overhead associated with copying the table and reconstructing secondary indexes.
see MySQL 5.6 Reference Manual -> InnoDB and Online DDL for more info.
It seems that online DDL also available in MariaDB
Alternatively you can use ALTER ONLINE TABLE to ensure that your ALTER
TABLE does n...
Java List.add() UnsupportedOperationException
...ractCollection<E> implements List<E> {
public void add(int index, E element) {
throw new UnsupportedOperationException();
}
public E set(int index, E element) {
throw new UnsupportedOperationException();
}
public E remove(int index) {
throw new...