feat: gracefully handle panics in plugins (#13329)

crates/polars-plan/src/dsl/function_expr/plugin.rs

@@ -1,5 +1,4 @@
 use std::ffi::CStr;
-use std::process::abort;
 use std::sync::RwLock;
 
 use arrow::ffi::{import_field_from_c, ArrowSchema};
@@ -109,7 +108,7 @@ pub(super) unsafe fn call_plugin(
         } else {
             let msg = retrieve_error_msg(lib);
             let msg = msg.to_string_lossy();
-            check_panic(msg.as_ref());
+            check_panic(msg.as_ref())?;
             polars_bail!(ComputeError: "the plugin failed with message: {}", msg)
         }
     } else {
@@ -156,17 +155,15 @@ pub(super) unsafe fn plugin_field(
         } else {
             let msg = retrieve_error_msg(lib);
             let msg = msg.to_string_lossy();
-            check_panic(msg.as_ref());
+            check_panic(msg.as_ref())?;
             polars_bail!(ComputeError: "the plugin failed with message: {}", msg)
         }
     } else {
         polars_bail!(ComputeError: "this polars engine doesn't support plugin version: {}", major)
     }
 }
 
-fn check_panic(msg: &str) {
-    if msg == "PANIC" {
-        eprintln!("The plugin panicked which is unrecoverable. Polars will abort");
-        abort()
-    }
+fn check_panic(msg: &str) -> PolarsResult<()> {
+    polars_ensure!(msg != "PANIC", ComputeError: "the plugin panicked\n\nThe message is suppressed. Set POLARS_VERBOSE=1 to send the panic message to stderr.");
+    Ok(())
 }