Removing is_vector_on_class_path helper method

Author: horakivo

graalpython/com.oracle.graal.python/src/com/oracle/graal/python/builtins/modules/GraalPythonModuleBuiltins.java

@@ -1321,13 +1321,4 @@ static PTuple doExport(Object vector,
             return createArrowCapsuleNode.execute(inliningTarget, arrowArray, arrowSchema);
         }
     }
-
-    @Builtin(name = "is_arrow_vector_on_class_path", minNumOfPositionalArgs = 0)
-    @GenerateNodeFactory
-    public abstract static class IsArrowVectorLoaded extends PythonBuiltinNode {
-        @Specialization
-        static boolean doSearch(@Bind("this") Node inliningTarget) {
-            return getContext(inliningTarget).arrowVectorSupport.isJavaArrowImplOnClassPath;
-        }
-    }
 }

graalpython/lib-graalpython/modules/interop/arrow.py

@@ -40,9 +40,13 @@
 import polyglot
 import java
 
-if not __graalpython__.is_arrow_vector_on_class_path():
-    raise KeyError("It is not possible to import Apache Arrow Vector classes because arrow-vector package is not on the class path. Please add this library to your project.")
-elif not __graalpython__.host_import_enabled:
+
+try:
+    java.type("org.apache.arrow.vector.BaseFixedWidthVector")
+except KeyError:
+    raise ImportError("It is not possible to import Apache Arrow Vector classes because arrow-vector package is not on the class path. Please add this library to your project.")
+
+if not __graalpython__.host_import_enabled:
     raise NotImplementedError("Host lookup is not allowed. You can allow it while building python context.")
 else:
     class TinyIntVector: