What We’re Building Today

Today we’re implementing a production-grade SQL-like query language for distributed log analytics. By the end of this lesson, you’ll have:

• Query Parser & Lexer: ANTLR-based parser supporting SELECT, WHERE, GROUP BY, ORDER BY, and aggregation functions

• Distributed Query Executor: Coordinator that pushes query execution to indexed nodes from Day 53’s distributed index

• Query Optimizer: Cost-based optimizer that rewrites queries to leverage existing indexes and minimize network traffic

• Result Aggregator: Merge-sort implementation that combines partial results from multiple nodes while maintaining memory efficiency