Databend built in scalar function development guide

Original text: https://databend.rs/development/how-to-write-scalar-functions/ What is a scalar function? ¶ Scalar functions (sometimes referred to as user-defined functions / UDFs) return a single value for each record, rather than as a result SET, and can be used in most places in queries or SET statements, except for the ...

Posted on Mon, 06 Dec 2021 20:16:35 -0500 by PHP'er

The Rust Programming Language - Chapter 15 smart pointers - 15.5 RefCell < T > and internal variability mode

15 smart pointer The pointer points to the memory address of the variable. It has no other functions except reference data, so there is no running overhead Smart pointer is a kind of data structure. Although it behaves like a pointer, it has additional metadata and functions. Rust's smart pointer provides functions other than including refere ...

Posted on Sat, 27 Nov 2021 20:17:55 -0500 by gojakie

Go and Rust, I want both!

Hello, I'm Zhang Jintao.Recently, there have been some changes in the Rust community / team, so Rust has been brought to the eyes of most people again.I've seen a lot of friends say recently:Is Rust still worth learning? Is the community unstableWhich is better, Rust or Go?Is Rust still worth learning?If someone asks me these questions, my answ ...

Posted on Fri, 26 Nov 2021 01:17:03 -0500 by gvp16

The Rust Programming Language - Chapter 13 functional language features in the Rust language: iterators and closures - 13.2 using iterators to process element sequences

13 functional language functions in rust language: iterators and closures Functional programming style usually includes taking a function as a parameter and return value of another function, and assigning a function as a value to a variable for subsequent execution In this chapter, we will introduce the following: Closure: a function like da ...

Posted on Sun, 21 Nov 2021 14:21:13 -0500 by andreash

Special function generation mechanism of C + + classes

Special function generation mechanism of C + + classes rule Refer to the instructions on Effective Morder C + + Default constructor: generated only if the class does not contain a user declared constructor.Destructor: generated by default. When the destructor of the base class is virtual, the default destructor of the derived class is virtua ...

Posted on Sat, 20 Nov 2021 20:57:29 -0500 by shatztal

Take a look at Rust and take note 4

Today, I'm free to take a look at chapter 4 - functions, closures and iterators Chapter 4: functions, closures and iterators Rust is a language that supports functional programming. Function, as a first-class citizen, is itself a type. Function types can be used as parameters or return values of other functions, can also be assign ...

Posted on Fri, 19 Nov 2021 22:30:02 -0500 by skyturk

libsecp256k1 bitcoin cryptoalgorithm open source library

2021SC@SDUSC The domain elements are defined in libsecp256k1, where Field defines the finite domain of secp256k1 G F ( p ) GF(p) GF(p) element, but the Field element ...

Posted on Sun, 07 Nov 2021 14:41:03 -0500 by jl9148

Opportunity of code 2020 -- boarding seat problem

Opportunity of code 2020 – boarding seat issues Advent of code 2020 – Binary Boarding This question is about using 10 byte characters to represent boarding seats. Aircraft seats have 128 rows and 8 columns. For example, "fbbffrlr" indicates that the position is in row 44 and column 5. B and F are used to represent the number ...

Posted on Sat, 06 Nov 2021 21:46:34 -0400 by cdm2

[algorithm] sword finger Offer II 083. Full Permutation without repeated element set 46. Full Permutation (Multilingual Implementation)

Thank you very much for reading this article~ Welcome[ 👍 [like][ ⭐ Collection][ 📝 [comments]~ It's not hard to give up, but it must be cool to insist~ I hope all of us can make a little progress every day~ This paper consists of White hat of the second leader: https://le-yi.blog.csdn.net/ Blog originality~ Sword finger Offer II 083. ...

Posted on Sat, 06 Nov 2021 20:43:52 -0400 by FireWhizzle

Sword finger Offer II 055. Binary search tree iterator 173. Binary search tree iterator (Java / C / C + + / Python / go / trust)

Thank you very much for reading this article~ Welcome[ 👍 [like][ ⭐ Collection][ 📝 [comments]~ It's not hard to give up, but it must be cool to insist~ I hope all of us can make a little progress every day~ This paper consists of White hat of the second leader: https://le-yi.blog.csdn.net/ Blog originality~ Sword finger Offer II 055. ...

Posted on Thu, 04 Nov 2021 19:54:27 -0400 by web_noob