Remove SerializedValues from public API of scylla crate.

scylla-cql/src/serialize/row.rs

@@ -52,13 +52,6 @@ impl<'a> RowSerializationContext<'a> {
     pub fn columns(&self) -> &'a [ColumnSpec] {
         self.columns
     }
-
-    /// Looks up and returns a column/bind marker by name.
-    // TODO: change RowSerializationContext to make this faster
-    #[inline]
-    pub fn column_by_name(&self, target: &str) -> Option<&ColumnSpec> {
-        self.columns.iter().find(|&c| c.name() == target)
-    }
 }
 
 /// Represents a set of values that can be sent along a CQL statement.
@@ -514,7 +507,7 @@ impl SerializedValues {
     pub const EMPTY: &'static SerializedValues = &SerializedValues::new();
 
     /// Constructs `SerializedValues` from given [`SerializeRow`] object.
-    pub fn from_serializable<T: SerializeRow>(
+    pub fn from_serializable<T: SerializeRow + ?Sized>(
         ctx: &RowSerializationContext,
         row: &T,
     ) -> Result<Self, SerializationError> {

scylla/Cargo.toml

@@ -39,6 +39,7 @@ full-serialization = [
     "num-bigint-04",
     "bigdecimal-04",
 ]
+unstable-testing = []
 
 [dependencies]
 scylla-macros = { version = "0.7.0", path = "../scylla-macros" }
@@ -96,6 +97,7 @@ time = "0.3"
 [[bench]]
 name = "benchmark"
 harness = false
+required-features = ["unstable-testing"]
 
 [lints.rust]
 unnameable_types = "warn"

scylla/benches/benchmark.rs

@@ -1,7 +1,8 @@
 use criterion::{criterion_group, criterion_main, Criterion};
 
 use bytes::BytesMut;
-use scylla::routing::partitioner::{calculate_token_for_partition_key, PartitionerName};
+use scylla::internal_testing::calculate_token_for_partition_key;
+use scylla::routing::partitioner::PartitionerName;
 use scylla_cql::frame::response::result::{ColumnType, NativeType};
 use scylla_cql::frame::types;
 use scylla_cql::serialize::row::SerializedValues;

scylla/src/client/session_test.rs

@@ -218,9 +218,6 @@ async fn test_prepared_statement() {
         .unwrap();
 
     let values = (17_i32, 16_i32, "I'm prepared!!!");
-    let serialized_values_complex_pk = prepared_complex_pk_statement
-        .serialize_values(&values)
-        .unwrap();
 
     session
         .execute_unpaged(&prepared_statement, &values)
@@ -245,12 +242,9 @@ async fn test_prepared_statement() {
         let prepared_token = Murmur3Partitioner
             .hash_one(&prepared_statement.compute_partition_key(&values).unwrap());
         assert_eq!(token, prepared_token);
-        let mut pk = SerializedValues::new();
-        pk.add_value(&17_i32, &ColumnType::Native(NativeType::Int))
-            .unwrap();
         let cluster_state_token = session
             .get_cluster_state()
-            .compute_token(&ks, "t2", &pk)
+            .compute_token(&ks, "t2", &(values.0,))
             .unwrap();
         assert_eq!(token, cluster_state_token);
     }
@@ -272,7 +266,7 @@ async fn test_prepared_statement() {
         assert_eq!(token, prepared_token);
         let cluster_state_token = session
             .get_cluster_state()
-            .compute_token(&ks, "complex_pk", &serialized_values_complex_pk)
+            .compute_token(&ks, "complex_pk", &values)
             .unwrap();
         assert_eq!(token, cluster_state_token);
     }
@@ -608,7 +602,6 @@ async fn test_token_calculation() {
             s.push('a');
         }
         let values = (&s,);
-        let serialized_values = prepared_statement.serialize_values(&values).unwrap();
         session
             .execute_unpaged(&prepared_statement, &values)
             .await
@@ -631,7 +624,7 @@ async fn test_token_calculation() {
         assert_eq!(token, prepared_token);
         let cluster_state_token = session
             .get_cluster_state()
-            .compute_token(&ks, "t3", &serialized_values)
+            .compute_token(&ks, "t3", &values)
             .unwrap();
         assert_eq!(token, cluster_state_token);
     }

scylla/src/cluster/metadata.rs

@@ -35,6 +35,7 @@ use futures::Stream;
 use itertools::Itertools;
 use rand::seq::{IndexedRandom, SliceRandom};
 use rand::{rng, Rng};
+use scylla_cql::frame::response::result::{ColumnSpec, TableSpec};
 use scylla_macros::DeserializeRow;
 use std::borrow::BorrowMut;
 use std::cell::Cell;
@@ -67,6 +68,22 @@ type PerTable<T> = HashMap<String, T>;
 type PerKsTable<T> = HashMap<(String, String), T>;
 type PerKsTableResult<T, E> = PerKsTable<Result<T, E>>;
 
+/// Indicates that reading metadata failed, but in a way
+/// that we can handle, by throwing out data for a keyspace.
+/// It is possible that some of the errors could be handled in even
+/// more granular way (e.g. throwing out a single table), but keyspace
+/// granularity seems like a good choice given how independent keyspaces
+/// are from each other.
+#[derive(Clone, Debug, Error)]
+pub(crate) enum SingleKeyspaceMetadataError {
+    #[error(transparent)]
+    MissingUDT(MissingUserDefinedType),
+    #[error("Partition key column with position {0} is missing from metadata")]
+    IncompletePartitionKey(i32),
+    #[error("Clustering key column with position {0} is missing from metadata")]
+    IncompleteClusteringKey(i32),
+}
+
 /// Allows to read current metadata from the cluster
 pub(crate) struct MetadataReader {
     control_connection_pool_config: PoolConfig,
@@ -92,7 +109,7 @@ pub(crate) struct MetadataReader {
 /// Describes all metadata retrieved from the cluster
 pub(crate) struct Metadata {
     pub(crate) peers: Vec<Peer>,
-    pub(crate) keyspaces: HashMap<String, Result<Keyspace, MissingUserDefinedType>>,
+    pub(crate) keyspaces: HashMap<String, Result<Keyspace, SingleKeyspaceMetadataError>>,
 }
 
 #[non_exhaustive] // <- so that we can add more fields in a backwards-compatible way
@@ -181,9 +198,14 @@ pub struct Keyspace {
 #[derive(Clone, Debug, PartialEq, Eq)]
 pub struct Table {
     pub columns: HashMap<String, Column>,
+    /// Names of the column of partition key.
+    /// All of the names are guaranteed to be present in `columns` field.
     pub partition_key: Vec<String>,
+    /// Names of the column of clustering key.
+    /// All of the names are guaranteed to be present in `columns` field.
     pub clustering_key: Vec<String>,
     pub partitioner: Option<String>,
+    pub(crate) pk_column_specs: Vec<ColumnSpec<'static>>,
 }
 
 #[derive(Clone, Debug, PartialEq, Eq)]
@@ -902,7 +924,7 @@ async fn query_keyspaces(
     conn: &Arc<Connection>,
     keyspaces_to_fetch: &[String],
     fetch_schema: bool,
-) -> Result<PerKeyspaceResult<Keyspace, MissingUserDefinedType>, MetadataError> {
+) -> Result<PerKeyspaceResult<Keyspace, SingleKeyspaceMetadataError>, MetadataError> {
     let rows = query_filter_keyspace_name::<(String, HashMap<String, String>)>(
         conn,
         "select keyspace_name, replication from system_schema.keyspaces",
@@ -953,15 +975,20 @@ async fn query_keyspaces(
 
         // As you can notice, in this file we generally operate on two layers of errors:
         // - Outer (MetadataError) if something went wrong with querying the cluster.
-        // - Inner (currently MissingUserDefinedType, possibly other variants in the future) if the fetched metadata
-        // turned out to not be fully consistent.
+        // - Inner (SingleKeyspaceMetadataError) if the fetched metadata turned out to not be fully consistent.
         // If there is an inner error, we want to drop metadata for the whole keyspace.
-        // This logic checks if either tables views or UDTs have such inner error, and returns it if so.
+        // This logic checks if either tables, views, or UDTs have such inner error, and returns it if so.
         // Notice that in the error branch, return value is wrapped in `Ok` - but this is the
         // outer error, so it just means there was no error while querying the cluster.
         let (tables, views, user_defined_types) = match (tables, views, user_defined_types) {
             (Ok(t), Ok(v), Ok(u)) => (t, v, u),
-            (Err(e), _, _) | (_, Err(e), _) | (_, _, Err(e)) => return Ok((keyspace_name, Err(e))),
+            (Err(e), _, _) | (_, Err(e), _) => return Ok((keyspace_name, Err(e))),
+            (_, _, Err(e)) => {
+                return Ok((
+                    keyspace_name,
+                    Err(SingleKeyspaceMetadataError::MissingUDT(e)),
+                ))
+            }
         };
 
         let keyspace = Keyspace {
@@ -1364,8 +1391,8 @@ mod toposort_tests {
 async fn query_tables(
     conn: &Arc<Connection>,
     keyspaces_to_fetch: &[String],
-    tables: &mut PerKsTableResult<Table, MissingUserDefinedType>,
-) -> Result<PerKeyspaceResult<PerTable<Table>, MissingUserDefinedType>, MetadataError> {
+    tables: &mut PerKsTableResult<Table, SingleKeyspaceMetadataError>,
+) -> Result<PerKeyspaceResult<PerTable<Table>, SingleKeyspaceMetadataError>, MetadataError> {
     let rows = query_filter_keyspace_name::<(String, String)>(
         conn,
         "SELECT keyspace_name, table_name FROM system_schema.tables",
@@ -1385,6 +1412,7 @@ async fn query_tables(
             partition_key: vec![],
             clustering_key: vec![],
             partitioner: None,
+            pk_column_specs: vec![],
         }));
 
         let mut entry = result
@@ -1409,8 +1437,9 @@ async fn query_tables(
 async fn query_views(
     conn: &Arc<Connection>,
     keyspaces_to_fetch: &[String],
-    tables: &mut PerKsTableResult<Table, MissingUserDefinedType>,
-) -> Result<PerKeyspaceResult<PerTable<MaterializedView>, MissingUserDefinedType>, MetadataError> {
+    tables: &mut PerKsTableResult<Table, SingleKeyspaceMetadataError>,
+) -> Result<PerKeyspaceResult<PerTable<MaterializedView>, SingleKeyspaceMetadataError>, MetadataError>
+{
     let rows = query_filter_keyspace_name::<(String, String, String)>(
         conn,
         "SELECT keyspace_name, view_name, base_table_name FROM system_schema.views",
@@ -1435,6 +1464,7 @@ async fn query_views(
                 partition_key: vec![],
                 clustering_key: vec![],
                 partitioner: None,
+                pk_column_specs: vec![],
             }))
             .map(|table| MaterializedView {
                 view_metadata: table,
@@ -1465,7 +1495,7 @@ async fn query_tables_schema(
     conn: &Arc<Connection>,
     keyspaces_to_fetch: &[String],
     udts: &PerKeyspaceResult<PerTable<Arc<UserDefinedType<'static>>>, MissingUserDefinedType>,
-) -> Result<PerKsTableResult<Table, MissingUserDefinedType>, MetadataError> {
+) -> Result<PerKsTableResult<Table, SingleKeyspaceMetadataError>, MetadataError> {
     // Upon migration from thrift to CQL, Cassandra internally creates a surrogate column "value" of
     // type EmptyType for dense tables. This resolves into this CQL type name.
     // This column shouldn't be exposed to the user but is currently exposed in system tables.
@@ -1484,7 +1514,7 @@ async fn query_tables_schema(
 
     let empty_ok_map = Ok(HashMap::new());
 
-    let mut tables_schema: HashMap<_, Result<_, MissingUserDefinedType>> = HashMap::new();
+    let mut tables_schema: HashMap<_, Result<_, SingleKeyspaceMetadataError>> = HashMap::new();
 
     rows.map(|row_result| {
         let (keyspace_name, table_name, column_name, kind, position, type_) = row_result?;
@@ -1518,7 +1548,10 @@ async fn query_tables_schema(
                     // is minor enough to ignore. Note that the first issue also applies to
                     // solution 1: but the keyspace won't be present in the result at all,
                     // which is arguably worse.
-                    tables_schema.insert((keyspace_name, table_name), Err(e.clone()));
+                    tables_schema.insert(
+                        (keyspace_name, table_name),
+                        Err(SingleKeyspaceMetadataError::MissingUDT(e.clone())),
+                    );
                     return Ok::<_, MetadataError>(());
                 }
             };
@@ -1532,7 +1565,10 @@ async fn query_tables_schema(
         let cql_type = match pre_cql_type.into_cql_type(&keyspace_name, keyspace_udts) {
             Ok(t) => t,
             Err(e) => {
-                tables_schema.insert((keyspace_name, table_name), Err(e));
+                tables_schema.insert(
+                    (keyspace_name, table_name),
+                    Err(SingleKeyspaceMetadataError::MissingUDT(e)),
+                );
                 return Ok::<_, MetadataError>(());
             }
         };
@@ -1549,21 +1585,21 @@ async fn query_tables_schema(
             .entry((keyspace_name, table_name))
             .or_insert(Ok((
                 HashMap::new(), // columns
-                HashMap::new(), // partition key
-                HashMap::new(), // clustering key
+                Vec::new(),     // partition key
+                Vec::new(),     // clustering key
             )))
         else {
             // This table was previously marked as broken, no way to insert anything.
             return Ok::<_, MetadataError>(());
         };
 
         if kind == ColumnKind::PartitionKey || kind == ColumnKind::Clustering {
-            let key_map = if kind == ColumnKind::PartitionKey {
+            let key_list: &mut Vec<(i32, String)> = if kind == ColumnKind::PartitionKey {
                 entry.1.borrow_mut()
             } else {
                 entry.2.borrow_mut()
             };
-            key_map.insert(position, column_name.clone());
+            key_list.push((position, column_name.clone()));
         }
 
         entry.0.insert(
@@ -1582,37 +1618,93 @@ async fn query_tables_schema(
     let mut all_partitioners = query_table_partitioners(conn).await?;
     let mut result = HashMap::new();
 
-    for ((keyspace_name, table_name), table_result) in tables_schema {
+    'tables_loop: for ((keyspace_name, table_name), table_result) in tables_schema {
         let keyspace_and_table_name = (keyspace_name, table_name);
 
-        let (columns, partition_key_columns, clustering_key_columns) = match table_result {
+        #[allow(clippy::type_complexity)]
+        let (columns, partition_key_columns, clustering_key_columns): (
+            HashMap<String, Column>,
+            Vec<(i32, String)>,
+            Vec<(i32, String)>,
+        ) = match table_result {
             Ok(table) => table,
             Err(e) => {
                 let _ = result.insert(keyspace_and_table_name, Err(e));
                 continue;
             }
         };
-        let mut partition_key = vec!["".to_string(); partition_key_columns.len()];
-        for (position, column_name) in partition_key_columns {
-            partition_key[position as usize] = column_name;
-        }
 
-        let mut clustering_key = vec!["".to_string(); clustering_key_columns.len()];
-        for (position, column_name) in clustering_key_columns {
-            clustering_key[position as usize] = column_name;
+        fn validate_key_columns(mut key_columns: Vec<(i32, String)>) -> Result<Vec<String>, i32> {
+            key_columns.sort_unstable_by_key(|(position, _)| *position);
+
+            key_columns
+                .into_iter()
+                .enumerate()
+                .map(|(idx, (position, column_name))| {
+                    // unwrap: I don't see the point of handling the scenario of fetching over
+                    // 2 * 10^9 columns.
+                    let idx: i32 = idx.try_into().unwrap();
+                    if idx == position {
+                        Ok(column_name)
+                    } else {
+                        Err(idx)
+                    }
+                })
+                .collect::<Result<Vec<_>, _>>()
         }
 
+        let partition_key = match validate_key_columns(partition_key_columns) {
+            Ok(partition_key_columns) => partition_key_columns,
+            Err(position) => {
+                result.insert(
+                    keyspace_and_table_name,
+                    Err(SingleKeyspaceMetadataError::IncompletePartitionKey(
+                        position,
+                    )),
+                );
+                continue 'tables_loop;
+            }
+        };
+
+        let clustering_key = match validate_key_columns(clustering_key_columns) {
+            Ok(clustering_key_columns) => clustering_key_columns,
+            Err(position) => {
+                result.insert(
+                    keyspace_and_table_name,
+                    Err(SingleKeyspaceMetadataError::IncompleteClusteringKey(
+                        position,
+                    )),
+                );
+                continue 'tables_loop;
+            }
+        };
+
         let partitioner = all_partitioners
             .remove(&keyspace_and_table_name)
             .unwrap_or_default();
 
+        // unwrap of get() result: all column names in `partition_key` are at this
+        // point guaranteed to be present in `columns`. See the construction of `partition_key`
+        let pk_column_specs = partition_key
+            .iter()
+            .map(|column_name| (column_name, columns.get(column_name).unwrap().clone().typ))
+            .map(|(name, typ)| {
+                let table_spec = TableSpec::owned(
+                    keyspace_and_table_name.0.clone(),
+                    keyspace_and_table_name.1.clone(),
+                );
+                ColumnSpec::owned(name.to_owned(), typ, table_spec)
+            })
+            .collect();
+
         result.insert(
             keyspace_and_table_name,
             Ok(Table {
                 columns,
                 partition_key,
                 clustering_key,
                 partitioner,
+                pk_column_specs,
             }),
         );
     }