Examples with JoinFilterPreAnalysisKey org.apache.druid.segment.join.filter.JoinFilterPreAnalysisKey used on opensource projects

Example 6 with JoinFilterPreAnalysisKey

use of org.apache.druid.segment.join.filter.JoinFilterPreAnalysisKey in project druid by druid-io.

the class HashJoinSegmentStorageAdapter method makeCursors.

@Override
public Sequence<Cursor> makeCursors(@Nullable final Filter filter, @Nonnull final Interval interval, @Nonnull final VirtualColumns virtualColumns, @Nonnull final Granularity gran, final boolean descending, @Nullable final QueryMetrics<?> queryMetrics) {
    final Filter combinedFilter = baseFilterAnd(filter);
    if (clauses.isEmpty()) {
        return baseAdapter.makeCursors(combinedFilter, interval, virtualColumns, gran, descending, queryMetrics);
    }
    // Filter pre-analysis key implied by the call to "makeCursors". We need to sanity-check that it matches
    // the actual pre-analysis that was done. Note: we can't infer a rewrite config from the "makeCursors" call (it
    // requires access to the query context) so we'll need to skip sanity-checking it, by re-using the one present
    // in the cached key.)
    final JoinFilterPreAnalysisKey keyIn = new JoinFilterPreAnalysisKey(joinFilterPreAnalysis.getKey().getRewriteConfig(), clauses, virtualColumns, combinedFilter);
    final JoinFilterPreAnalysisKey keyCached = joinFilterPreAnalysis.getKey();
    if (!keyIn.equals(keyCached)) {
        // It is a bug if this happens. The implied key and the cached key should always match.
        throw new ISE("Pre-analysis mismatch, cannot execute query");
    }
    final List<VirtualColumn> preJoinVirtualColumns = new ArrayList<>();
    final List<VirtualColumn> postJoinVirtualColumns = new ArrayList<>();
    determineBaseColumnsWithPreAndPostJoinVirtualColumns(virtualColumns, preJoinVirtualColumns, postJoinVirtualColumns);
    // We merge the filter on base table specified by the user and filter on the base table that is pushed from
    // the join
    JoinFilterSplit joinFilterSplit = JoinFilterAnalyzer.splitFilter(joinFilterPreAnalysis, baseFilter);
    preJoinVirtualColumns.addAll(joinFilterSplit.getPushDownVirtualColumns());
    final Sequence<Cursor> baseCursorSequence = baseAdapter.makeCursors(joinFilterSplit.getBaseTableFilter().isPresent() ? joinFilterSplit.getBaseTableFilter().get() : null, interval, VirtualColumns.create(preJoinVirtualColumns), gran, descending, queryMetrics);
    Closer joinablesCloser = Closer.create();
    return Sequences.<Cursor, Cursor>map(baseCursorSequence, cursor -> {
        assert cursor != null;
        Cursor retVal = cursor;
        for (JoinableClause clause : clauses) {
            retVal = HashJoinEngine.makeJoinCursor(retVal, clause, descending, joinablesCloser);
        }
        return PostJoinCursor.wrap(retVal, VirtualColumns.create(postJoinVirtualColumns), joinFilterSplit.getJoinTableFilter().orElse(null));
    }).withBaggage(joinablesCloser);
}

Example 7 with JoinFilterPreAnalysisKey

use of org.apache.druid.segment.join.filter.JoinFilterPreAnalysisKey in project druid by druid-io.

the class JoinableFactoryWrapper method createSegmentMapFn.

/**
 * Creates a Function that maps base segments to {@link HashJoinSegment} if needed (i.e. if the number of join
 * clauses is > 0). If mapping is not needed, this method will return {@link Function#identity()}.
 *
 * @param baseFilter         Filter to apply before the join takes place
 * @param clauses            Pre-joinable clauses
 * @param cpuTimeAccumulator An accumulator that we will add CPU nanos to; this is part of the function to encourage
 *                           callers to remember to track metrics on CPU time required for creation of Joinables
 * @param query              The query that will be run on the mapped segments. Usually this should be
 *                           {@code analysis.getBaseQuery().orElse(query)}, where "analysis" is a
 *                           {@link DataSourceAnalysis} and "query" is the original
 *                           query from the end user.
 */
public Function<SegmentReference, SegmentReference> createSegmentMapFn(@Nullable final Filter baseFilter, final List<PreJoinableClause> clauses, final AtomicLong cpuTimeAccumulator, final Query<?> query) {
    // compute column correlations here and RHS correlated values
    return JvmUtils.safeAccumulateThreadCpuTime(cpuTimeAccumulator, () -> {
        if (clauses.isEmpty()) {
            return Function.identity();
        } else {
            final JoinableClauses joinableClauses = JoinableClauses.createClauses(clauses, joinableFactory);
            final JoinFilterRewriteConfig filterRewriteConfig = JoinFilterRewriteConfig.forQuery(query);
            // Pick off any join clauses that can be converted into filters.
            final Set<String> requiredColumns = query.getRequiredColumns();
            final Filter baseFilterToUse;
            final List<JoinableClause> clausesToUse;
            if (requiredColumns != null && filterRewriteConfig.isEnableRewriteJoinToFilter()) {
                final Pair<List<Filter>, List<JoinableClause>> conversionResult = convertJoinsToFilters(joinableClauses.getJoinableClauses(), requiredColumns, Ints.checkedCast(Math.min(filterRewriteConfig.getFilterRewriteMaxSize(), Integer.MAX_VALUE)));
                baseFilterToUse = Filters.maybeAnd(Lists.newArrayList(Iterables.concat(Collections.singleton(baseFilter), conversionResult.lhs))).orElse(null);
                clausesToUse = conversionResult.rhs;
            } else {
                baseFilterToUse = baseFilter;
                clausesToUse = joinableClauses.getJoinableClauses();
            }
            // Analyze remaining join clauses to see if filters on them can be pushed down.
            final JoinFilterPreAnalysis joinFilterPreAnalysis = JoinFilterAnalyzer.computeJoinFilterPreAnalysis(new JoinFilterPreAnalysisKey(filterRewriteConfig, clausesToUse, query.getVirtualColumns(), Filters.maybeAnd(Arrays.asList(baseFilterToUse, Filters.toFilter(query.getFilter()))).orElse(null)));
            return baseSegment -> new HashJoinSegment(baseSegment, baseFilterToUse, clausesToUse, joinFilterPreAnalysis);
        }
    });
}