How ClickHouse Batches Async Inserts in a Per-Key Queue
ClickHouse hashes each async insert into a per-key buffer and flushes it on size, count, or an adaptive deadline.
Insert
How ClickHouse Maps an INSERT onto the Table's Schema
ClickHouse resolves an INSERT’s columns by name into a sample block, then squashes, dedup-stamps and fans the data out to the sinks.
How ClickHouse Deduplicates Retried Inserts with a Content Hash
ClickHouse hashes each inserted block into a UInt128 dedup token and keeps a bounded window of recent tokens to detect retries.