Abstract: To solve the problem of excessive dependency on Hive, SparkSQL uses a new SQL optimizer instead of the optimizer in Hive, which is Catalyst.

Abstract: PSI is the full term for Private Set Intersection (PSI), which means that two parties holding data can calculate the Intersection of their data sets without exposing any data Set information other than the Intersection.

I still remember that in an interview a long time ago, I was having a happy conversation with the technology brother. Suddenly, he asked me to talk about shock reduction and throttling. Wipe a cool sweat, I answered with trembling, not confident tone: er, tremble is should be to prevent the meaning of shaking, throttling is probably to save the flow... At that time, my psychological activity is such: that year psychological quality is really bad, this did not turn over the past, the final result is: know the shame and then brave with me...

A name is a convention for referring to or addressing any entity. Almost everything around us has a name. The same goes for programming. But does it have to be named? Or can you own "anonymous" goods? The answer is yes. Python provides Lambda functions, also known as anonymous functions, which are actually nameless. So, let's continue with these Python "anonymous mysteries" in the following order.

Focus on front small Ou, to read more original technical articles Function is an object, each Function is the Function instance of type, and other reference types have properties and methods the Function name is the pointer to the Function object, not with a particular Function binding (a Function may have more than one name) related {code - > 4 kinds of definitions of ways... } 10.1 Arrow function Anywhere a function expression can be used, the arrow function {code... } If only...

This article source: making here | | GitEE point here, a concept, functional functional programming is a kind of structured programming paradigm, the main idea is to put the operation process as far as possible into a series of nested function calls. The conceptual expression of functional programming has a very abstract feel and can be based on examples: {code... } Here calculations are done procedurally, with the above block of code focusing on describing the execution of the program. Look at the function-based approach to the solution: {code......

1 - Use the function keyword {code... } (a: string) => Represents a function that takes a string as input and returns no arguments. You can define an alias using the type keyword: {code... } Call signatures use Call signatures to add additional properties to the function. TypeScript functions are also values, along with other v...

The Python library is numerous and constantly updated, so the most effective way to learn about it is to read the Python documentation. Both Google and Baidu. Turtle library Chinese documentation: {code... } Development tools: Python version: 3.6.4 related modules: Turtle library and other Python built-in modules. Install Python and add it to the environment variable. Making a simple clock using Turtle Library can be divided into three steps...

Abstract: Are you a Python developer who has a C or C++ library that you want to use from Python? If so, Python bindings allow you to call functions and pass data from Python to C or C++, allowing you to take advantage of both languages.