Hi, I am trying to understand how to identify the schema for an Iceberg snapshot.
Looking at the spec, I see the following: Snapshots A snapshot consists of the following fields: v1v2FieldDescription *required* *required* snapshot-id A unique long ID *optional* *optional* parent-snapshot-id The snapshot ID of the snapshot’s parent. Omitted for any snapshot with no parent *required* sequence-number A monotonically increasing long that tracks the order of changes to a table *required* *required* timestamp-ms A timestamp when the snapshot was created, used for garbage collection and table inspection *optional* *required* manifest-list The location of a manifest list for this snapshot that tracks manifest files with additional meadata *optional* manifests A list of manifest file locations. Must be omitted if manifest-list is present *optional* *required* summary A string map that summarizes the snapshot changes, including operation (see below) *optional* *optional* schema-id ID of the table’s current schema when the snapshot was createdAlso the table metadata portion of the spec says the following: v1v2FieldDescription *optional* *required* schemas A list of schemas, stored as objects with schema-id. For a v2 Iceberg table, my understanding is that the reader needs to do the following to figure out the schema of a snapshot: - Read the schema-id for the snapshot - Use the schemas field from the table metadata and find the schema corresponding to the snapshot's schema-id Since schema-id is optional in V2 for a given snapshot, is this the correct approach? How does this work, if the schema-id field is missing? For a V1 Iceberg table, how do we determine the schema of a particular snapshot? Thanks Vivek
