public List<Map<String, Object>> execute(String columnNames[]) {
List<Map<String, Object>> combinedRowList = null;
Set<NoSqlPredicate> inefficientPredicates = new HashSet<NoSqlPredicate>();
for (NoSqlPredicate predicate : predicateList) {
if (predicate.canExecuteEfficiently()) {
List<Map<String, Object>> rowList = predicate.execute(columnNames);
if (combinedRowList != null) {
String primaryKeyName = storageSource.getTablePrimaryKeyName(tableName);
combinedRowList = combineRowLists(primaryKeyName, combinedRowList, rowList, operator);
} else {
combinedRowList = rowList;
}
} else {
inefficientPredicates.add(predicate);
}
}
if (inefficientPredicates.isEmpty()) return combinedRowList;
List<Map<String, Object>> filteredRowList = new ArrayList<Map<String, Object>>();
for (Map<String, Object> row : combinedRowList) {
for (NoSqlPredicate predicate : inefficientPredicates) {
if (predicate.matchesRow(row)) {
filteredRowList.add(row);
}
}
}
return filteredRowList;
}
