query test progress

src/merger/cache.rs

@@ -0,0 +1,24 @@
+use dashmap::DashMap;
+
+pub struct StatementCache {
+  /// Maps a Cache Key (String) -> SQL String (String)
+  statements: DashMap<String, String>,
+}
+
+impl StatementCache {
+  pub fn new(_max_capacity: u64) -> Self {
+    Self {
+      statements: DashMap::new(),
+    }
+  }
+
+  /// Retrieve an existing statement name by key, or None if it missed
+  pub fn get(&self, key: &str) -> Option<String> {
+    self.statements.get(key).map(|v| v.clone())
+  }
+
+  /// Insert a completely verified/compiled statement string into the cache
+  pub fn insert(&self, key: String, sql: String) {
+    self.statements.insert(key, sql);
+  }
+}