GH-3354: Override LocalInputFile.toString to return the path

parquet-common/src/main/java/org/apache/parquet/io/LocalInputFile.java

@@ -99,4 +99,9 @@ public void close() throws IOException {
       }
     };
   }
+
+  @Override
+  public String toString() {
+    return path.toString();
+  }
 }

parquet-common/src/test/java/org/apache/parquet/io/TestLocalInputOutput.java

@@ -47,6 +47,17 @@ public void outputFileOverwritesFile() throws IOException {
     }
   }
 
+  @Test
+  public void inputFileToStringReturnsPath() throws IOException {
+    Path path = Paths.get(createTempFile().getPath());
+    InputFile read = new LocalInputFile(path);
+    // toString() is used by ParquetFileReader when constructing error messages
+    // such as "<path> is not a Parquet file (length is too low: ...)". A
+    // path-bearing toString() keeps those error messages actionable for
+    // implementations that don't expose a more specific accessor.
+    assertEquals(path.toString(), read.toString());
+  }
+
   @Test
   public void outputFileCreateFailsAsFileAlreadyExists() throws IOException {
     Path path = Paths.get(createTempFile().getPath());