Introduce new deserialization framework upper layer abstractions

examples/cqlsh-rs.rs

@@ -4,7 +4,7 @@ use rustyline::error::ReadlineError;
 use rustyline::{CompletionType, Config, Context, Editor};
 use rustyline_derive::{Helper, Highlighter, Hinter, Validator};
 use scylla::transport::Compression;
-use scylla::{QueryResult, Session, SessionBuilder};
+use scylla::{LegacyQueryResult, Session, SessionBuilder};
 use std::env;
 
 #[derive(Helper, Highlighter, Validator, Hinter)]
@@ -173,7 +173,7 @@ impl Completer for CqlHelper {
     }
 }
 
-fn print_result(result: &QueryResult) {
+fn print_result(result: &LegacyQueryResult) {
     if result.rows.is_none() {
         println!("OK");
         return;

examples/tower.rs

@@ -12,7 +12,7 @@ struct SessionService {
 
 // A trivial service implementation for sending parameterless simple string requests to Scylla.
 impl Service<scylla::query::Query> for SessionService {
-    type Response = scylla::QueryResult;
+    type Response = scylla::LegacyQueryResult;
     type Error = scylla::transport::errors::QueryError;
     type Future = Pin<Box<dyn Future<Output = Result<Self::Response, Self::Error>>>>;
 

examples/tracing.rs

@@ -8,8 +8,8 @@ use scylla::statement::{
     prepared_statement::PreparedStatement, query::Query, Consistency, SerialConsistency,
 };
 use scylla::tracing::TracingInfo;
-use scylla::transport::iterator::RowIterator;
-use scylla::QueryResult;
+use scylla::transport::iterator::LegacyRowIterator;
+use scylla::LegacyQueryResult;
 use scylla::{Session, SessionBuilder};
 use std::env;
 use std::num::NonZeroU32;
@@ -42,7 +42,7 @@ async fn main() -> Result<()> {
     query.set_serial_consistency(Some(SerialConsistency::LocalSerial));
 
     // QueryResult will contain a tracing_id which can be used to query tracing information
-    let query_result: QueryResult = session.query_unpaged(query.clone(), &[]).await?;
+    let query_result: LegacyQueryResult = session.query_unpaged(query.clone(), &[]).await?;
     let query_tracing_id: Uuid = query_result
         .tracing_id
         .ok_or_else(|| anyhow!("Tracing id is None!"))?;
@@ -79,14 +79,14 @@ async fn main() -> Result<()> {
     // To trace execution of a prepared statement tracing must be enabled for it
     prepared.set_tracing(true);
 
-    let execute_result: QueryResult = session.execute_unpaged(&prepared, &[]).await?;
+    let execute_result: LegacyQueryResult = session.execute_unpaged(&prepared, &[]).await?;
     println!("Execute tracing id: {:?}", execute_result.tracing_id);
 
     // PAGED QUERY_ITER EXECUTE_ITER
     // It's also possible to trace paged queries like query_iter or execute_iter
     // After iterating through all rows iterator.get_tracing_ids() will give tracing ids
     // for all page queries
-    let mut row_iterator: RowIterator = session.query_iter(query, &[]).await?;
+    let mut row_iterator: LegacyRowIterator = session.query_iter(query, &[]).await?;
 
     while let Some(_row) = row_iterator.next().await {
         // Receive rows
@@ -105,7 +105,7 @@ async fn main() -> Result<()> {
     batch.set_tracing(true);
 
     // Run the batch and print its tracing_id
-    let batch_result: QueryResult = session.batch(&batch, ((),)).await?;
+    let batch_result: LegacyQueryResult = session.batch(&batch, ((),)).await?;
     println!("Batch tracing id: {:?}\n", batch_result.tracing_id);
 
     // CUSTOM

scylla-cql/Cargo.toml

@@ -27,10 +27,13 @@ lz4_flex = { version = "0.11.1" }
 async-trait = "0.1.57"
 serde = { version = "1.0", features = ["derive"], optional = true }
 time-03 = { package = "time", version = "0.3", optional = true }
+yoke = { version = "0.7", features = ["derive"] }
+stable_deref_trait = "1.2"
 
 [dev-dependencies]
 assert_matches = "1.5.0"
 criterion = "0.4"        # Note: v0.5 needs at least rust 1.70.0
+lazy_static = "1"        # We can migrate to std::sync::LazyLock once MSRV is bumped to 1.80.
 # Use large-dates feature to test potential edge cases
 time-03 = { package = "time", version = "0.3.21", features = ["large-dates"] }
 uuid = { version = "1.0", features = ["v4"] }