fix(compiler): add a benchmark for #862

crates/apollo-compiler/Cargo.toml

@@ -53,6 +53,11 @@ name = "fields-validation"
 path = "benches/fields_validation.rs"
 harness = false
 
+[[bench]]
+name = "fragments-validation"
+path = "benches/fragments_validation.rs"
+harness = false
+
 [[test]]
 name = "main"
 

crates/apollo-compiler/benches/fragments_validation.rs

@@ -0,0 +1,51 @@
+use apollo_compiler::ExecutableDocument;
+use apollo_compiler::Schema;
+use criterion::*;
+use std::fmt::Write;
+
+fn bench_big_schema_many_fragments(c: &mut Criterion) {
+    const NUM_INTERFACES: usize = 200;
+    const NUM_OBJECTS: usize = 10_000;
+
+    let mut sdl = String::new();
+    for i in 0..NUM_INTERFACES {
+        _ = writeln!(&mut sdl, r#"interface Intf{i} {{ field: Int! }}"#);
+    }
+    for o in 0..NUM_OBJECTS {
+        let i = o % NUM_INTERFACES;
+        _ = writeln!(
+            &mut sdl,
+            r#"type Ty{o} implements Intf{i} {{ field: Int! }}"#
+        );
+    }
+
+    _ = writeln!(&mut sdl, "type Query {{");
+    for i in 0..NUM_INTERFACES {
+        _ = writeln!(&mut sdl, "  intf{i}: Intf{i}");
+    }
+    _ = writeln!(&mut sdl, "}}");
+
+    let schema = Schema::parse_and_validate(sdl, "schema.graphql").unwrap();
+    let mut selection = String::new();
+    let mut fragments = String::new();
+    for i in 0..NUM_INTERFACES {
+        _ = writeln!(&mut selection, "  intf{i} {{ ...frag{i} }}");
+        _ = writeln!(&mut fragments, "fragment frag{i} on Ty{i} {{ field }}");
+    }
+    let query = format!(
+        "query {{
+  {selection}}}
+{fragments}"
+    );
+
+    c.bench_function("big_schema_many_fragments", move |b| {
+        b.iter(|| {
+            let doc =
+                ExecutableDocument::parse_and_validate(&schema, &query, "query.graphql").unwrap();
+            black_box(doc);
+        });
+    });
+}
+
+criterion_group!(fragments, bench_big_schema_many_fragments,);
+criterion_main!(fragments);