Addressed all comments

Author: c21

sql/core/src/main/java/org/apache/spark/sql/execution/datasources/orc/OrcColumnStatistics.java

@@ -31,7 +31,7 @@
  * tree pre-ordering. This is used for aggregate push down in ORC.
  *
  * For nested data types (array, map and struct), the sub-field statistics are stored recursively
- * inside parent column's `children` field. Here is an example of `OrcColumnStatistics`:
+ * inside parent column's children field. Here is an example of {@link OrcColumnStatistics}:
  *
  * Data schema:
  * c1: int

sql/core/src/main/java/org/apache/spark/sql/execution/datasources/orc/OrcFooterReader.java

@@ -27,7 +27,7 @@
 import java.util.Queue;
 
 /**
- * `OrcFooterReader` is a util class which encapsulates the helper
+ * {@link OrcFooterReader} is a util class which encapsulates the helper
  * methods of reading ORC file footer.
  */
 public class OrcFooterReader {

sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/orc/OrcUtils.scala

@@ -402,7 +402,7 @@ object OrcUtils extends Logging {
     var columnsStatistics: OrcColumnStatistics = null
     try {
       columnsStatistics = OrcFooterReader.readStatistics(reader)
-    } catch { case e: RuntimeException =>
+    } catch { case e: Exception =>
       throw new SparkException(
         s"Cannot read columns statistics in file: $filePath. Please consider disabling " +
         s"ORC aggregate push down by setting 'spark.sql.orc.aggregatePushdown' to false.", e)