Posted on February 24, 2023 • 3 minutes • 496 words
Table of contents
I love working on my projects in my free time. Some of my projects include –
goselect provides SQL-like ‘select’ interface for files. This means one can execute a select query like:
select name, path, size from . where or(like(name, result.*), eq(isdir, true)) order by 3 desc
to get the filename, file path and size of all the files that are directories or their names begin with the term result. This query orders the results by size in descending order.
I created goselect to understand the following:
- Parsing: The parsing pipeline typically involves a lexer, a parser and an AST.
- Recursive descent parser
- Representation of functions in the code. Functions like
trimtake a single parameter, functions like
currentDatetake zero parameters, whereas functions like
concattake a variable number of parameters.
- Execution of scalar functions like
substr. These functions are stateless and run for each row. They may take a parameter and return a value for each row. These functions can also involve nesting. For example,
- Execution of aggregation functions like
countDistinct. These functions run over a collection of rows and return an ultimate value. These functions can also involve nesting. For example,
- Execution of nested scalar and aggregation functions like
countDistinct(lower(name)). Here, the function
lower(name)runs for each row, whereas
countDistinctruns over a collection of rows.
🔹 Gamifying Refactoring
Refactoring is fun to learn and practice. It is even more fun to understand it together by playing a game.
All you got to do is - identify code smells, justify each of them by going beyond ilities, finish all of this in a fixed time and get points for your team. Learn and have fun. This is the idea behind “Gamifying Refactoring”.
Data Anonymization tool helps build anonymized production data dumps, which can be used for performance testing, security testing, debugging and development. We implemented this tool in Kotlin, which works with Java 8 & Kotlin.
Flips is an implementation of Feature Toggles pattern for Java. Feature Toggles are a powerful technique, allowing teams to change system behaviour without changing the code.
The idea behind Flips is to let the users implement toggles with minimum configuration and coding. This library should work with Java8, Spring Core / Spring MVC / Spring Boot.
I have a separate blog about this library.
My current interest is in Designing storage engines and databases, and I plan to build a key/value storage engine in Rust. The idea is to create a write-optimized storage engine using an LSM tree and provide read-optimized paths. Some ideas that I would like to explore are:
- Separating values from keys: WiscKey
- Explore io_uring and glommio
- Cache bloom filters in memory
- Cache level-0 SSTables in memory