Here is exactly how an engine writes to an Iceberg table, step by step, from data files through the atomic commit that makes ACID guarantees possible.
The Volcano model processes one row at a time. Vectorized execution processes batches with SIMD. Code generation fuses operators into compiled code.
Iceberg's hidden partitioning separates physical layout from user queries using transform functions.
Query optimizers transform SQL into execution plans using rule-based rewrites, cost-based search, and adaptive runtime adjustments.
