query-engine

Apache Doris is a real-time analytics and hybrid search database for AI agents.

Official repository of Trino, the distributed SQL query engine for big data, formerly known as PrestoSQL (https://trino.io)

Quick start: pip install jsoniq ⛈️ RumbleDB 2.1.0 "Cedrus Libani" 🌳 for Apache Spark | Run queries on your large-scale, messy datasets (JSON, text, CSV, Parquet, Delta...) | Data Lakehouse with Updates, Scripting, Declarative Machine Learning and more

Helper library for building and running advanced and dynamic queries using JPA in Spring Boot.

The Apache Storm implementation of the Bullet backend

Java bindings for Apache DataFusion

Tiny Database: Query Engine, Storage Engine, Calcite, ANTLR

CQEngine Next - Maintained Fork

Query JSON data using SQL - Filter, aggregate, sort, and project without a database.

A semantic and technical analysis of musical scores based on Information Retrieval Principles

DBest is an interactive database engine designed for creating, visualizing, and executing query plans. This engine enables users to design query execution plans through an intuitive drag-and-drop interface, making it easier to understand query execution, optimize performance, and integrate diverse data sources.

A real-time distributed OLAP engine

Java SDK for the VGI (Vector Gateway Interface) protocol — host DuckDB scalar, table, aggregate, and table-in-out functions in an external worker over Arrow IPC.

Making DuckDB's capabilities available to the JVM efficiently. Includes a DuckDB-backed CQEngine persistence plugin: 7x less memory, and joins across collections.

Substrait Decentralized Compliance Framework

This is a database query evaluator project as part of my university of edinburgh coursework.

A containerized distributed data processing system that demonstrates core cloud database concepts through hands-on implementation using Java, Apache Arrow, Iceberg, and Calcite

Query Engine in Java with Vectorized and Data Driven Code Generation and Arrow & Parquet support

An advanced form of the previously implemented search Engine which acts as a information retrieval system over the cranfield collection of the 1400 documents and also makes use of the stemmer algorithm. Other things are pretty much the same as the previously implemented SearchEngine project.

In-memory relational query engine built on the Volcano/iterator model. SQL parsing, query planning and optimisation in Java.