@Override public PageOutput open( TaskSource taskSource, final Schema inputSchema, final Schema outputSchema, final PageOutput output) { final PluginTask task = taskSource.loadTask(PluginTask.class); // create jsonColumns/baseColumn final List<Column> outputColumns = outputSchema.getColumns(); final List<Column> inputColumns = inputSchema.getColumns(); Map<String, Column> inputColumnMap = Maps.newHashMap(); final List<Column> jsonColumns = new ArrayList<>(); for (Column column : outputColumns) { if (!inputColumns.contains(column)) { jsonColumns.add(column); } else { inputColumnMap.put(column.getName(), column); } } final Column baseColumn = inputColumnMap.get(task.getBaseColumn().getName()); // create timestampParserMap final HashMap<String, TimestampParser> timestampParserMap = Maps.newHashMap(); for (ColumnConfig jsonColumnConfig : task.getJsonColumns()) { if (Types.TIMESTAMP.equals(jsonColumnConfig.getType())) { String format = jsonColumnConfig.getOption().get(String.class, "format"); DateTimeZone timezone = DateTimeZone.forID(task.getTimeZone()); TimestampParser parser = new TimestampParser(task.getJRuby(), format, timezone); timestampParserMap.put(task.getJoinedColumnsPrefix() + jsonColumnConfig.getName(), parser); } } // get jsonTable final HashMap<String, HashMap<String, String>> jsonTable = task.getJsonTable(); return new LeftOuterJoinJsonTableFilterFilteredPageOutput( inputSchema, outputSchema, baseColumn, jsonTable, jsonColumns, timestampParserMap, output); }