問題文
An analyst is told that a workspace's SQL warehouses run with Photon. Which description of what Photon does is accurate?
選択肢
- It rewrites SQL into an internal dialect, so queries must be written with Photon-specific syntax to benefit from it.
- It is a vectorized execution engine that speeds up scans, filters, joins and aggregations on supported operations, without changing the SQL that is written.
- It reduces cost by scaling the warehouse down to zero between queries, which is why it is described as a performance feature.
- It is a caching layer that stores the result of every single query so that repeated questions are answered without touching the data.