jcamachor commented on a change in pull request #1328:
URL: https://github.com/apache/hive/pull/1328#discussion_r461672364



##########
File path: 
jdbc-handler/src/main/java/org/apache/hive/storage/jdbc/dao/JdbcRecordIterator.java
##########
@@ -59,9 +63,26 @@ public JdbcRecordIterator(Connection conn, PreparedStatement 
ps, ResultSet rs, C
       fieldNamesProperty = 
Preconditions.checkNotNull(conf.get(Constants.JDBC_QUERY_FIELD_NAMES));
       fieldTypesProperty = 
Preconditions.checkNotNull(conf.get(Constants.JDBC_QUERY_FIELD_TYPES));
     } else {
-      fieldNamesProperty = 
Preconditions.checkNotNull(conf.get(serdeConstants.LIST_COLUMNS));
-      fieldTypesProperty = 
Preconditions.checkNotNull(conf.get(serdeConstants.LIST_COLUMN_TYPES));
+        try {
+          if(conf.get(Constants.JDBC_QUERY) == null)    {
+            ResultSetMetaData metadata = rs.getMetaData();
+            int numColumns = metadata.getColumnCount();
+            List<String> columnNames = new ArrayList<String>(numColumns);
+            for (int i = 0; i < numColumns; i++) {
+              columnNames.add(metadata.getColumnName(i + 1));
+            }
+            fieldNamesProperty = String.join(",",columnNames);
+          }
+          else
+            fieldNamesProperty = 
Preconditions.checkNotNull(conf.get(serdeConstants.LIST_COLUMNS));
+        }
+        catch (Exception e) {
+          LOGGER.error("Error while trying to get column names.", e);
+          throw new HiveJdbcDatabaseAccessException("Error while trying to get 
column names: " + e.getMessage(), e);
+        }
+        fieldTypesProperty = 
Preconditions.checkNotNull(conf.get(serdeConstants.LIST_COLUMN_TYPES));
     }
+    LOGGER.debug("Iterator ColumnNames = "+fieldNamesProperty);

Review comment:
       `LOGGER.debug("Iterator ColumnNames = {}", fieldNamesProperty);`

##########
File path: 
jdbc-handler/src/main/java/org/apache/hive/storage/jdbc/dao/JdbcRecordIterator.java
##########
@@ -59,9 +63,26 @@ public JdbcRecordIterator(Connection conn, PreparedStatement 
ps, ResultSet rs, C
       fieldNamesProperty = 
Preconditions.checkNotNull(conf.get(Constants.JDBC_QUERY_FIELD_NAMES));
       fieldTypesProperty = 
Preconditions.checkNotNull(conf.get(Constants.JDBC_QUERY_FIELD_TYPES));
     } else {
-      fieldNamesProperty = 
Preconditions.checkNotNull(conf.get(serdeConstants.LIST_COLUMNS));
-      fieldTypesProperty = 
Preconditions.checkNotNull(conf.get(serdeConstants.LIST_COLUMN_TYPES));
+        try {

Review comment:
       nit. Indentation seems off.

##########
File path: 
jdbc-handler/src/main/java/org/apache/hive/storage/jdbc/dao/JdbcRecordIterator.java
##########
@@ -59,9 +63,26 @@ public JdbcRecordIterator(Connection conn, PreparedStatement 
ps, ResultSet rs, C
       fieldNamesProperty = 
Preconditions.checkNotNull(conf.get(Constants.JDBC_QUERY_FIELD_NAMES));
       fieldTypesProperty = 
Preconditions.checkNotNull(conf.get(Constants.JDBC_QUERY_FIELD_TYPES));
     } else {
-      fieldNamesProperty = 
Preconditions.checkNotNull(conf.get(serdeConstants.LIST_COLUMNS));
-      fieldTypesProperty = 
Preconditions.checkNotNull(conf.get(serdeConstants.LIST_COLUMN_TYPES));
+        try {
+          if(conf.get(Constants.JDBC_QUERY) == null)    {
+            ResultSetMetaData metadata = rs.getMetaData();
+            int numColumns = metadata.getColumnCount();
+            List<String> columnNames = new ArrayList<String>(numColumns);
+            for (int i = 0; i < numColumns; i++) {
+              columnNames.add(metadata.getColumnName(i + 1));
+            }
+            fieldNamesProperty = String.join(",",columnNames);
+          }
+          else

Review comment:
       This is by convention, we use { & } even for single line statements.




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