omt | A cache-efficiency weight balanced binary tree | Key Value Database library
kandi X-RAY | omt Summary
kandi X-RAY | omt Summary
OMT is short for Order Maintenance Tree, which is dreamed up by Tokutek, and used in TokuDB. It's a weight balanced binary tree, each node maintains the weights of its left and right subtrees. OMT having better CPU cache efficiency than skiplist (it's very cool as you improve it to vEB layout). For more details, please see Cartesian Tree: After rebalance: /* * * (key-5) * / * (key-4) (key-7) * / / * (key-1) (key-6) (key-71) * */.
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QUESTION
I would like to copy some columns data from two different sheets. Columns are not the same since this information comes from two different data bases.
The highlighted columns are the information I need to copy into the new Database:
In this database there are two green highlighted columns.
If there's id data on column "M" I take this if not I copy from column "F":
My code works. The problem is from the moment I load an important amount of data, Excel crashes.
...ANSWER
Answered 2021-Feb-26 at 16:23Some suggestions below. You do not need to loop for most of the copying, and as Nathan points out you could switch to assigning Value
directly as that would be faster, as long as you don't also need to copy formatting.
QUESTION
What is the relationship corresponding to implementation inheritance (realized with private inheritance in C++) in the current UML specification (2.5.1, December 2017)?
Not to be confused with interface inheritance (subtyping) which corresponds in UML to the interface realization relationship denoted by a dashed line and hollow triangle, nor with implementation and interface inheritance (subclassing) which corresponds in UML to the generalization relationship denoted by a solid line and hollow triangle.
Note. — The book Design Patterns by Erich Gamma et al. published in 1994 (before UML) whose class diagrams are based on OMT (an ancestor of UML) used informally a solid line and hollow triangle with an “(implementation)” modifier for denoting implementation inheritance:
Figure. — OMT class diagram of the class Adapter design pattern.
...ANSWER
Answered 2020-Dec-20 at 02:39GoF proposes some terminology (p. 13-15) which you seem to have adopted:
- an object packages data (attributes) and procedures (operations) that operate on these data.
- the interface to an object is the set of its operations’ signatures.
- a type is the name of a particular interface.
- a subtype is a type that is a superset of another type.
- a supertype is a type that is a subset of another type.
- the implementation of an object is the set of its attributes and operations’ implementations.
- a class defines an object’s interface and implementation.
- a subclass defines a class that is a superset of another class.
- a superclass defines a class that is a subset of another class.
- inheritance in this understanding corresponds to reusing an implementation.
This understanding is driven by reuse, the main topic of their book: types are just reuse of an interface, whereas classes are reuse of an implementation. This view is reductionist:
- Nothing is said about the promises and expectations behind an interface (e.g. that I can only
pop()
from the stack if I havepush()
ed something on it first). It is just about the ability to accept the requests defined by the interface. - The distinction between an abstract class (which defines an interface without providing an implementation) and an interface is not at all clarified.
The last point is perfectly illustrated in your graphical example.
- In the GoF narrative,
Target
andAdaptee
are both defined as interface (see p. 141, section "participants"), whereasAdapter
implements these interfaces. - Yet, in the schema,
Target
is represented as an abstract class (see p. 365) andAdapter
’sRequest()
is implemented by callingSpecificRequest()
but it is not shown thatAdapter
must implementSpecificRequest()
as well. - Finally, GoF explains that
Adapter
is a subclass ofAdaptee
, which seems somewhat inconsistent.
The UML definition of an interface is much closer to what Liskov would call a type:
An Interface […] represents a declaration of a set of public Features and obligations that together constitute a coherent service. An Interface specifies a contract […]. The obligations associated with an Interface are in the form of constraints (such as pre- and postconditions) or protocol specifications, which may impose ordering restrictions on interactions through the Interface. Interfaces may not be instantiated. Instead, an Interface specification is implemented or realized […].
Classes define sets of features, may implement interfaces and can be instantiated.
What you call interface inheritance is ambiguous:
- If you mean a class that implements the interface, it is interface realization, denoted by a dotted line with a hollow triangle on the side of the interface to be realized.
- If you mean an interface that inherits another interface (subtyping), it is interface specialization, denoted by a plain line with a hollow triangle on the side of the more general interface.
What you call implementation and interface inheritance is ambiguous, since it is not clear if inheritance applies only to interface or also to implementation:
- If you mean the implementation of an existing interface with a class, it is interface realization with a dotted line with a hollow triangle on the side of the interface to be realized.
- If you mean the simultaneous inheritance of both an interface and their implementation, then it is class specialization, denoted by a plain line with a hollow triangle on the side of the more general class.
If with implementation inheritance you were thinking of inheriting the implementation without inheriting the interface, i.e. private inheritance, then there is nothing special foreseen in UML, and you have to translate your implementation intent into UML concepts, as explained for example in this SO question.
Now to illustrate the graphical notation, here is the class Adapter pattern as described in GoF using the participant roles:
And here is a more logic diagram, if considering that Adaptee
is in reality an existing implementation that needs to be adapted:
QUESTION
Can you please tell me why is the percentage of a used drive (disk space) shows 28.5% with ansible while the df -k shows only 19% used on remote Linux host?
Here is my playbook code:
...ANSWER
Answered 2020-Mar-25 at 17:30The question is not really about ansible as you would have the same problem with manual calculation.
To get the exact same percentage as df, you'll have to add the reserved bloc count of the partition. You can get this value for example with tune2fs. In your case:
QUESTION
I'm unable to convert the select query to the update statement.
...ANSWER
Answered 2020-Feb-12 at 05:41You can use such an Update statement containing with .. as
clause :
QUESTION
I have a gulp task that runs rollup, compiles typescript and generates modules for dynamic imports:
...ANSWER
Answered 2019-Oct-01 at 09:47I have resolved my problem via the beautiful Rich Harris shimport:
In the HTML I've done this:
QUESTION
I have a list of word that I want to correct using unspell but in these words, there could be some specific word that hunspell didn't know and that he has to not correct(the list is not defined and too long to be added by hand)
what method do I could use to solve that?
I already tried to find and upgrade the dictionary
here is a list of the word :
...ANSWER
Answered 2019-Jul-15 at 10:50Use dictionary()
with add_words
parameter -
QUESTION
Following is the query
...ANSWER
Answered 2019-Mar-07 at 12:34Try using a subquery:
QUESTION
I'm creating a simple Text Editor in Qt.
I'm able to edit selected text and make it, for example, bold or underline or both. The problem is when the selected text is partially bold, normal or other.
So the only way to make it good is to take the selected text and edit it char by char (if it is already cursive and i want it bold too, the char must be both).
This is part of my code in which i can change selected text into bold:
...ANSWER
Answered 2018-Jun-08 at 13:35Perhaps you can use QTextCursor::mergeCharFormat(const QTextCharFormat & modifier)
? http://doc.qt.io/qt-5/qtextcursor.html#mergeCharFormat
Example:
QUESTION
If we're using OpenMapTiles, can we point Nominatim to OMT's database, or are the schemas different?
It is taking us quite a long time to processes the global OSM dataset for Nominatim, but we could save ourselves some time/storage/etc. if both products can share the same Postgres database.
...ANSWER
Answered 2018-May-25 at 07:02The geocoder Nominatim uses a different database scheme than a tile server. Geocoders and tile servers need slightly different data. Furthermore, for maximum performance, the data has to be pre-processed in different ways. That's why you can't use the same database for both.
QUESTION
I'm trying to create new project sheets in a folder, however I can't find a way to ensure the sheet is a project sheet.
Here is my code so far:
...ANSWER
Answered 2018-Apr-05 at 16:17Create the sheet from a template, either using the global project template or a user defined template if you want to customize.
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