BTree | Fast sorted collections for Swift using in-memory B-trees | Dataset library

by attaswift Swift Version: v4.1.0 License: MIT

X-Ray Key Features Code Snippets(3)Community Discussions(10)Vulnerabilities Install Support

kandi X-RAY | BTree Summary

BTree is a Swift library typically used in Artificial Intelligence, Dataset applications. BTree has no bugs, it has no vulnerabilities, it has a Permissive License and it has medium support. You can download it from GitHub.

Fast sorted collections for Swift using in-memory B-trees

Support

Quality

Security

License

Reuse

Support

BTree has a medium active ecosystem.

It has 1283 star(s) with 102 fork(s). There are 32 watchers for this library.

It had no major release in the last 12 months.

There are 13 open issues and 16 have been closed. On average issues are closed in 63 days. There are 3 open pull requests and 0 closed requests.

It has a neutral sentiment in the developer community.

The latest version of BTree is v4.1.0

Quality

BTree has no bugs reported.

Security

BTree has no vulnerabilities reported, and its dependent libraries have no vulnerabilities reported.

License

BTree is licensed under the MIT License. This license is Permissive.

Permissive licenses have the least restrictions, and you can use them in most projects.

Reuse

BTree releases are available to install and integrate.

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BTree Key Features

No Key Features are available at this moment for BTree.

BTree Examples and Code Snippets

Creates a BTree .

javascript

Lines of Code : 19

License : Non-SPDX (Apache License 2.0)

Copy

function BTree(minimumDegree) {
	/**
	 * The root of the tree.
	 * @type {BNode}
	 */
	this.root = new BNode();

	/**
	 * The minimum number of the keys of a node.
	 * @type {number}
	 */
	this.t = minimumDegree;

	/**
	 * The number of items stored

Btree .

javascript

Lines of Code : 7

License : Non-SPDX (Apache License 2.0)

Copy

function BSTree() {
	/**
	 * The root of the tree.
	 * @type {BSNode|null}
	 */
	this.root = null;
}

Validates a BT B BTree .

javascript

Lines of Code : 4

License : No License

Copy

function validateBalancedBT_3(tree) {
  if (!tree || !tree.root) return true;
  return checkHeight(tree.root) !== Number.MIN_SAFE_INTEGER;
}

Community Discussions

Trending Discussions on BTree

Ecto - unable to drop custom-named unique index

Postgres syntax error with creat when use $$

Why I'm getting a deadlock from mysql using SELECT ... FOR UPDATE lock?

How can I make this basic MySQL SELECT query faster on 1 billion rows?

PostgreSQL UPSERT (INSERT ... ON CONFLICT UPDATE) fails

How to Compile Object files into an Archive using Make

Sequelize returning one result when counting AVG in Eager Loading

set the time property as the m-dimension of postgis geometry or as a separate attribute

Hash Index on Pgsql table in EFCore

How to insert long text (>3K chars) in columns with unique constraint

QUESTION

Ecto - unable to drop custom-named unique index

Asked 2021-Jun-10 at 21:04

I'm unable to successfully run an Ecto migration to drop a unique index that, when originally created, had been provided with a :name attribute (so that the default index name was not used). However, I am now unable to drop that index, because it seems as though Ecto is trying to look for an index with the incorrect name (although I've provided it).

The unique index was originally created via a migration like so:

...

ANSWER

Answered 2021-Jun-10 at 21:04

When you do drop index("foo", [:bar_pending_index]) you're invoking the same index/3 function used to create an index, similar to unique_index/3.

Looking at the documentation of those two functions you'll notice that the second argument is always the columns to be used for the index (the example on drop: drop index("posts", [:name]) is a bit ambiguous because of the column name :name).

So, what you should do is actually something very similar to the way you created the index, like:

Source https://stackoverflow.com/questions/67926561

QUESTION

Postgres syntax error with creat when use $$

Asked 2021-Jun-10 at 15:20

I want execute next script migration. But i catch syntax error. How can i resolve it?

Script example:

...

ANSWER

Answered 2021-Jun-10 at 15:20

I think postgresql get confused between dollar quoting inside function, probably if you give it a tag name will solve the issue

Source https://stackoverflow.com/questions/67923521

QUESTION

Why I'm getting a deadlock from mysql using SELECT ... FOR UPDATE lock?

Asked 2021-Jun-09 at 13:29

I have two threads, they have to update the same table but the first one is using a primary key to lock a single record, the second thread have to lock a set of records using another index. The lock is made with SELECT ... FOR UPDATE steatment, I cannot understand why they run into a deadlock.

This is the table:

...

ANSWER

Answered 2021-Jun-08 at 18:39

Please elaborate your use case. If you two have threads trying to secure a lock you can simply fire the update statements simultaneously and based on row count returned from the update you can frame the logic accordingly. Need more information to be able to comment.

Source https://stackoverflow.com/questions/67892643

QUESTION

How can I make this basic MySQL SELECT query faster on 1 billion rows?

Asked 2021-Jun-08 at 08:40

I have a large 100GB dataset of website content that's around 1 billion rows that I've indexed into a single MySQL 8 table.

...

ANSWER

Answered 2021-Jun-08 at 08:40

You don't have a index / query issue (because of the count(*) quick time. It's IO / network issue, so you can try to add selected fields into the index to put data in memory :

https://mariadb.com/kb/en/building-the-best-index-for-a-given-select/

part : "Covering" indexes

Source https://stackoverflow.com/questions/67883378

QUESTION

PostgreSQL UPSERT (INSERT ... ON CONFLICT UPDATE) fails

Asked 2021-Jun-07 at 15:57

I have a row in my postgresql database that I want to update.

...

ANSWER

Answered 2021-Jun-07 at 15:57

The NOT NULL constraints are checked first. That makes sense, because they must be satisfied for an INSERT to succeed.

If you know for sure that there is already a matching row, use a regular UPDATE.

An alternative might be to use a CHECK (colname IS NOT NULL) constraint instead of NOT NULL.

Source https://stackoverflow.com/questions/67874661

QUESTION

How to Compile Object files into an Archive using Make

Asked 2021-Jun-05 at 21:17

Problem

I'm writing a B-tree in c and it's getting pretty big. I have a struct for the tree, one for the nodes, and one for the items (key/value). I'd like to compile the object files from all three header files into an archive (.a) using make. Whenever I try to compile using make it uses the archive without every building the objects. Any idea why?

...

ANSWER

Answered 2021-Jun-05 at 21:12

Most likely because your sources variable src is empty. Which means your objects list variable obj is empty. Which means that your library lib/btree.a doesn't depend on anything, so make doesn't build anything.

This is most likely because this:

Source https://stackoverflow.com/questions/67853928

QUESTION

Sequelize returning one result when counting AVG in Eager Loading

Asked 2021-Jun-03 at 16:24

I have been trying to fix this problem for a day now but no luck. I am using Sequelize With Nodejs and MySQL dialect.

I am querying for Influencers whilst also calculating their average ratings from a InfluencerRating record. They are associated through a oneToMany relation.

Here is my Influencer modal:

...

ANSWER

Answered 2021-Jun-03 at 16:24

Made some changes to findAll. Can give it a try:

Source https://stackoverflow.com/questions/67774307

QUESTION

set the time property as the m-dimension of postgis geometry or as a separate attribute

Asked 2021-Jun-02 at 16:39

Basic version info first:

...

ANSWER

Answered 2021-Jun-02 at 16:39

You can tell the index to sort its records already using geom as 2D by means of using the function ST_Force2D in the index creation, so that the database doesn't need to do it in query time:

Source https://stackoverflow.com/questions/67803635

QUESTION

Hash Index on Pgsql table in EFCore

Asked 2021-May-29 at 04:37

How can I specify the index type as "hash" for pgsql db in Efcore fluent api?

Eg:

modelBuilder.Entity().HasIndex(u => u.PId).IsUnique();

Is there any extension method specific to pgsql that accepts the index type? The default index type being created is 'btree'.

...

ANSWER

Answered 2021-May-29 at 04:37

you can use the HasMethod like this:

Source https://stackoverflow.com/questions/67501673

QUESTION

How to insert long text (>3K chars) in columns with unique constraint

Asked 2021-May-27 at 04:15

There are some problems with inserting text in postgres that is too long. when I have a simple table with text, I can insert text as long as I like (I tested up to 40K chars). However, when I add a unique constraint I begin to encounter a strange btree problem, see the minimal working example (MWE) below

MWE:

...

ANSWER

Answered 2021-May-27 at 04:01

I found a solution over at UNIQUE constraint on large VARCHARs - PostgreSQL

Solution:

Source https://stackoverflow.com/questions/67715283

Community Discussions, Code Snippets contain sources that include Stack Exchange Network

Vulnerabilities

No vulnerabilities reported

Install BTree

You can download it from GitHub.

Support

For any new features, suggestions and bugs create an issue on GitHub. If you have any questions check and ask questions on community page Stack Overflow .

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