ClickHouse Core

ClickHouse from the inside out. Why it exists, the one-binary architecture, the MergeTree family as a data model, parts/granules/marks, the sparse primary index, skip indexes, codecs and compression, materialized views, projections, async inserts, Distributed and ReplicatedMergeTree, joins, reading EXPLAIN PIPELINE, and the three settings that decide whether a query OOMs, spills, or runs. Ends with a capstone migration.