Try fix for deadlock problem

Cargo.toml

@@ -29,7 +29,7 @@ oxrdfio = { version= "0.1.0-alpha.6", features = ["rdf-star"] }
 polars = "0.41.3"
 tokio = "1.32.1"
 log = "0.4.21"
-pyo3 = "0.22.1"
+pyo3 = "0.22.2"
 reqwest = "0.12.3"
 env_logger = "0.11.3"
 thiserror = "1.0.58"

py_chrontext/src/lib.rs

@@ -173,14 +173,15 @@ impl PyEngine {
         if self.engine.is_none() {
             self.init()?;
         }
-
-        let mut builder = Builder::new_multi_thread();
-        builder.enable_all();
-        let (mut df, mut datatypes, pushdown_contexts) = builder
-            .build()
-            .unwrap()
-            .block_on(self.engine.as_mut().unwrap().query(sparql))
-            .map_err(|err| PyChrontextError::QueryExecutionError(err))?;
+        let (mut df, mut datatypes, pushdown_contexts) = py.allow_threads(move || {
+            let mut builder = Builder::new_multi_thread();
+            builder.enable_all();
+            builder
+                .build()
+                .unwrap()
+                .block_on(self.engine.as_mut().unwrap().query(sparql))
+                .map_err(|err| PyChrontextError::QueryExecutionError(err))
+        })?;
 
         (df, datatypes) =
             fix_cats_and_multicolumns(df, datatypes, native_dataframe.unwrap_or(false));