HunterL commented on a change in pull request #1328: URL: https://github.com/apache/hive/pull/1328#discussion_r461646240
########## 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: Missing `{` & ` }` for this else ########## 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) { Review comment: Small white space nitpick here, should be `if (conf.get(Constants.JDBC_QUERY) == null) {` ########## 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: Small whitespace nitpick here `LOGGER.debug("Iterator ColumnNames = " + fieldNamesProperty);` ---------------------------------------------------------------- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. For queries about this service, please contact Infrastructure at: us...@infra.apache.org --------------------------------------------------------------------- To unsubscribe, e-mail: gitbox-unsubscr...@hive.apache.org For additional commands, e-mail: gitbox-h...@hive.apache.org