Examples with IsNull org.apache.spark.sql.sources.IsNull used on opensource projects

Example 1 with IsNull

use of org.apache.spark.sql.sources.IsNull in project Gaffer by gchq.

the class FiltersToOperationConverter method getFunctionsFromFilter.

/**
 * Converts a Spark {@link Filter} to a map from group to a list of Gaffer {@link TupleAdaptedPredicate}s.
 * <p>
 * Note that Spark also applies all the filters provided to the {@code buildScan(String[], Filter[])} method
 * so not implementing some of the provided {@link Filter}s in Gaffer will not cause errors. However, as many as
 * possible should be implemented so that as much filtering as possible happens in iterators running in Accumulo's
 * tablet servers (this avoids unnecessary data transfer from Accumulo to Spark).
 *
 * @param filter The {@link Filter} to transform.
 * @return A map from {@link String} to {@link TupleAdaptedPredicate}s implementing the provided {@link Filter}.
 */
private Map<String, List<TupleAdaptedPredicate<String, ?>>> getFunctionsFromFilter(final Filter filter) {
    final Map<String, List<TupleAdaptedPredicate<String, ?>>> map = new HashMap<>();
    if (filter instanceof EqualTo) {
    // Not dealt with as requires a Predicate<?> that returns null if either the controlValue or the
    // test value is null - the API of Predicate<?> doesn't permit this.
    } else if (filter instanceof EqualNullSafe) {
        final EqualNullSafe equalNullSafe = (EqualNullSafe) filter;
        final Predicate<?> isEqual = new IsEqual(equalNullSafe.value());
        final Set<String> relevantGroups = getGroupsFromFilter(filter);
        if (null != relevantGroups) {
            for (final String group : relevantGroups) {
                if (!map.containsKey(group)) {
                    map.put(group, new ArrayList<>());
                }
                map.get(group).add(new TupleAdaptedPredicate<>(isEqual, new String[] { equalNullSafe.attribute() }));
            }
        }
        LOGGER.debug("Converted {} to IsEqual ({})", filter, equalNullSafe.attribute());
    } else if (filter instanceof GreaterThan) {
        final GreaterThan greaterThan = (GreaterThan) filter;
        final Predicate<?> isMoreThan = new IsMoreThan((Comparable<?>) greaterThan.value(), false);
        final Set<String> relevantGroups = getGroupsFromFilter(filter);
        if (null != relevantGroups) {
            for (final String group : relevantGroups) {
                if (!map.containsKey(group)) {
                    map.put(group, new ArrayList<>());
                }
                map.get(group).add(new TupleAdaptedPredicate<>(isMoreThan, new String[] { greaterThan.attribute() }));
            }
        }
        LOGGER.debug("Converted {} to isMoreThan ({})", filter, greaterThan.attribute());
    } else if (filter instanceof GreaterThanOrEqual) {
        final GreaterThanOrEqual greaterThan = (GreaterThanOrEqual) filter;
        final Predicate<?> isMoreThan = new IsMoreThan((Comparable<?>) greaterThan.value(), true);
        final Set<String> relevantGroups = getGroupsFromFilter(filter);
        if (null != relevantGroups) {
            for (final String group : relevantGroups) {
                if (!map.containsKey(group)) {
                    map.put(group, new ArrayList<>());
                }
                map.get(group).add(new TupleAdaptedPredicate<>(isMoreThan, new String[] { greaterThan.attribute() }));
            }
        }
        LOGGER.debug("Converted {} to IsMoreThan ({})", filter, greaterThan.attribute());
    } else if (filter instanceof LessThan) {
        final LessThan lessThan = (LessThan) filter;
        final Predicate<?> isLessThan = new IsLessThan((Comparable<?>) lessThan.value(), false);
        final Set<String> relevantGroups = getGroupsFromFilter(filter);
        if (null != relevantGroups) {
            for (final String group : relevantGroups) {
                if (!map.containsKey(group)) {
                    map.put(group, new ArrayList<>());
                }
                map.get(group).add(new TupleAdaptedPredicate<>(isLessThan, new String[] { lessThan.attribute() }));
            }
        }
        LOGGER.debug("Converted {} to IsLessThan ({})", filter, lessThan.attribute());
    } else if (filter instanceof LessThanOrEqual) {
        final LessThanOrEqual lessThan = (LessThanOrEqual) filter;
        final Predicate<?> isLessThan = new IsLessThan((Comparable<?>) lessThan.value(), true);
        final Set<String> relevantGroups = getGroupsFromFilter(filter);
        if (null != relevantGroups) {
            for (final String group : relevantGroups) {
                if (!map.containsKey(group)) {
                    map.put(group, new ArrayList<>());
                }
                map.get(group).add(new TupleAdaptedPredicate<>(isLessThan, new String[] { lessThan.attribute() }));
            }
        }
        LOGGER.debug("Converted {} to LessThanOrEqual ({})", filter, lessThan.attribute());
    } else if (filter instanceof In) {
        final In in = (In) filter;
        final Predicate<?> isIn = new IsIn(new HashSet<>(Arrays.asList(in.values())));
        final Set<String> relevantGroups = getGroupsFromFilter(filter);
        if (null != relevantGroups) {
            for (final String group : relevantGroups) {
                if (!map.containsKey(group)) {
                    map.put(group, new ArrayList<>());
                }
                map.get(group).add(new TupleAdaptedPredicate<>(isIn, new String[] { in.attribute() }));
            }
        }
        LOGGER.debug("Converted {} to IsIn ({})", filter, in.attribute());
    } else if (filter instanceof IsNull) {
        final IsNull isNull = (IsNull) filter;
        final Predicate<?> doesntExist = new Not<>(new Exists());
        final Set<String> relevantGroups = getGroupsFromFilter(filter);
        if (null != relevantGroups) {
            for (final String group : relevantGroups) {
                if (!map.containsKey(group)) {
                    map.put(group, new ArrayList<>());
                }
                map.get(group).add(new TupleAdaptedPredicate<>(doesntExist, new String[] { isNull.attribute() }));
            }
        }
        LOGGER.debug("Converted {} to Not(Exists) ({})", filter, isNull.attribute());
    } else if (filter instanceof IsNotNull) {
        final IsNotNull isNotNull = (IsNotNull) filter;
        final Predicate<?> exists = new Exists();
        final Set<String> relevantGroups = getGroupsFromFilter(filter);
        if (null != relevantGroups) {
            for (final String group : relevantGroups) {
                if (!map.containsKey(group)) {
                    map.put(group, new ArrayList<>());
                }
                map.get(group).add(new TupleAdaptedPredicate<>(exists, new String[] { isNotNull.attribute() }));
            }
        }
        LOGGER.debug("Converted {} to Exists ({})", filter, isNotNull.attribute());
    } else if (filter instanceof And) {
        final And and = (And) filter;
        final Map<String, List<TupleAdaptedPredicate<String, ?>>> left = getFunctionsFromFilter(and.left());
        final Map<String, List<TupleAdaptedPredicate<String, ?>>> right = getFunctionsFromFilter(and.right());
        final Set<String> relevantGroups = getGroupsFromFilter(filter);
        if (null != relevantGroups) {
            for (final String group : relevantGroups) {
                final List<TupleAdaptedPredicate<String, ?>> concatFilters = new ArrayList<>();
                if (null != left.get(group)) {
                    concatFilters.addAll(left.get(group));
                }
                if (null != right.get(group)) {
                    concatFilters.addAll(right.get(group));
                }
                if (!map.containsKey(group)) {
                    map.put(group, new ArrayList<>());
                }
                map.get(group).addAll(concatFilters);
            }
        }
        LOGGER.debug("Converted {} to list of filters ({})", filter, StringUtils.join(map.entrySet(), ','));
    }
    return map;
}