ryzhyk commented on code in PR #707:
URL: https://github.com/apache/iceberg-rust/pull/707#discussion_r1849634146
##########
crates/integrations/datafusion/src/table/mod.rs:
##########
@@ -60,14 +66,52 @@ impl IcebergTableProvider {
let schema =
Arc::new(schema_to_arrow_schema(table.metadata().current_schema())?);
- Ok(IcebergTableProvider { table, schema })
+ Ok(IcebergTableProvider {
+ table,
+ snapshot_id: None,
+ schema,
+ })
}
/// Asynchronously tries to construct a new [`IcebergTableProvider`]
/// using the given table. Can be used to create a table provider from an
existing table regardless of the catalog implementation.
pub async fn try_new_from_table(table: Table) -> Result<Self> {
let schema =
Arc::new(schema_to_arrow_schema(table.metadata().current_schema())?);
- Ok(IcebergTableProvider { table, schema })
+ Ok(IcebergTableProvider {
+ table,
+ snapshot_id: None,
+ schema,
+ })
+ }
+
+ /// Asynchronously tries to construct a new [`IcebergTableProvider`]
+ /// using a specific snapshot of the given table. Can be used to create a
table provider from an existing table regardless of the catalog implementation.
+ pub async fn try_new_from_table_snapshot(table: Table, snapshot_id: i64)
-> Result<Self> {
+ let schema_id = table
+ .metadata()
+ .snapshot_by_id(snapshot_id)
+ .ok_or_else(|| {
+ Error::new(
+ ErrorKind::Unexpected,
+ format!(
+ "snapshot id {snapshot_id} not found in table {}",
+ table.identifier().name()
+ ),
+ )
+ })?
+ .schema_id()
Review Comment:
@liurenjie1024 , I am new to Iceberg. Can you help me to understand what it
means that a particular snapshot doesn't have a schema id and why it's ok to
use the table's latest schema in this case (which I think what the
`Snapshot::schema` function returns in this case)?
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