Examples with Table org.apache.phoenix.compile.JoinCompiler.Table used on opensource projects

Example 1 with Table

use of org.apache.phoenix.compile.JoinCompiler.Table in project phoenix by apache.

the class QueryCompiler method compileJoinQuery.

/*
     * Call compileJoinQuery() for join queries recursively down to the leaf JoinTable nodes.
     * This matches the input JoinTable node against patterns in the following order:
     * 1. A (leaf JoinTable node, which can be a named table reference or a subquery of any kind.)
     *    Returns the compilation result of a single table scan or of an independent subquery.
     * 2. Matching either of (when hint USE_SORT_MERGE_JOIN not specified):
     *        1) A LEFT/INNER JOIN B
     *        2) A LEFT/INNER JOIN B (LEFT/INNER JOIN C)+, if hint NO_STAR_JOIN not specified
     *        where A can be a named table reference or a flat subquery, and B, C, ... can be a named
     *        table reference, a sub-join or a subquery of any kind.
     *    Returns a HashJoinPlan{scan: A, hash: B, C, ...}.
     * 3. Matching pattern:
     *        A RIGHT/INNER JOIN B (when hint USE_SORT_MERGE_JOIN not specified)
     *        where B can be a named table reference or a flat subquery, and A can be a named table
     *        reference, a sub-join or a subquery of any kind.
     *    Returns a HashJoinPlan{scan: B, hash: A}.
     *    NOTE that "A LEFT/RIGHT/INNER/FULL JOIN B RIGHT/INNER JOIN C" is viewed as
     *    "(A LEFT/RIGHT/INNER/FULL JOIN B) RIGHT/INNER JOIN C" here, which means the left part in the
     *    parenthesis is considered a sub-join.
     *    viewed as a sub-join.
     * 4. All the rest that do not qualify for previous patterns or conditions, including FULL joins.
     *    Returns a SortMergeJoinPlan, the sorting part of which is pushed down to the JoinTable nodes
     *    of both sides as order-by clauses.
     * NOTE that SEMI or ANTI joins are treated the same way as LEFT joins in JoinTable pattern matching.
     *    
     * If no join algorithm hint is provided, according to the above compilation process, a join query 
     * plan can probably consist of both HashJoinPlan and SortMergeJoinPlan which may enclose each other.
     * TODO 1) Use table statistics to guide the choice of join plans.
     *      2) Make it possible to hint a certain join algorithm for a specific join step.
     */
@SuppressWarnings("unchecked")
protected QueryPlan compileJoinQuery(StatementContext context, List<Object> binds, JoinTable joinTable, boolean asSubquery, boolean projectPKColumns, List<OrderByNode> orderBy) throws SQLException {
    byte[] emptyByteArray = new byte[0];
    List<JoinSpec> joinSpecs = joinTable.getJoinSpecs();
    if (joinSpecs.isEmpty()) {
        Table table = joinTable.getTable();
        SelectStatement subquery = table.getAsSubquery(orderBy);
        if (!table.isSubselect()) {
            context.setCurrentTable(table.getTableRef());
            PTable projectedTable = table.createProjectedTable(!projectPKColumns, context);
            TupleProjector projector = new TupleProjector(projectedTable);
            TupleProjector.serializeProjectorIntoScan(context.getScan(), projector);
            context.setResolver(FromCompiler.getResolverForProjectedTable(projectedTable, context.getConnection(), subquery.getUdfParseNodes()));
            table.projectColumns(context.getScan());
            return compileSingleFlatQuery(context, subquery, binds, asSubquery, !asSubquery, null, projectPKColumns ? projector : null, true);
        }
        QueryPlan plan = compileSubquery(subquery, false);
        PTable projectedTable = table.createProjectedTable(plan.getProjector());
        context.setResolver(FromCompiler.getResolverForProjectedTable(projectedTable, context.getConnection(), subquery.getUdfParseNodes()));
        return new TupleProjectionPlan(plan, new TupleProjector(plan.getProjector()), table.compilePostFilterExpression(context));
    }
    boolean[] starJoinVector;
    if (!this.useSortMergeJoin && (starJoinVector = joinTable.getStarJoinVector()) != null) {
        Table table = joinTable.getTable();
        PTable initialProjectedTable;
        TableRef tableRef;
        SelectStatement query;
        TupleProjector tupleProjector;
        if (!table.isSubselect()) {
            context.setCurrentTable(table.getTableRef());
            initialProjectedTable = table.createProjectedTable(!projectPKColumns, context);
            tableRef = table.getTableRef();
            table.projectColumns(context.getScan());
            query = joinTable.getAsSingleSubquery(table.getAsSubquery(orderBy), asSubquery);
            tupleProjector = new TupleProjector(initialProjectedTable);
        } else {
            SelectStatement subquery = table.getAsSubquery(orderBy);
            QueryPlan plan = compileSubquery(subquery, false);
            initialProjectedTable = table.createProjectedTable(plan.getProjector());
            tableRef = plan.getTableRef();
            context.getScan().setFamilyMap(plan.getContext().getScan().getFamilyMap());
            query = joinTable.getAsSingleSubquery((SelectStatement) plan.getStatement(), asSubquery);
            tupleProjector = new TupleProjector(plan.getProjector());
        }
        context.setCurrentTable(tableRef);
        PTable projectedTable = initialProjectedTable;
        int count = joinSpecs.size();
        ImmutableBytesPtr[] joinIds = new ImmutableBytesPtr[count];
        List<Expression>[] joinExpressions = new List[count];
        JoinType[] joinTypes = new JoinType[count];
        PTable[] tables = new PTable[count];
        int[] fieldPositions = new int[count];
        StatementContext[] subContexts = new StatementContext[count];
        QueryPlan[] subPlans = new QueryPlan[count];
        HashSubPlan[] hashPlans = new HashSubPlan[count];
        fieldPositions[0] = projectedTable.getColumns().size() - projectedTable.getPKColumns().size();
        for (int i = 0; i < count; i++) {
            JoinSpec joinSpec = joinSpecs.get(i);
            Scan subScan = ScanUtil.newScan(originalScan);
            subContexts[i] = new StatementContext(statement, context.getResolver(), subScan, new SequenceManager(statement));
            subPlans[i] = compileJoinQuery(subContexts[i], binds, joinSpec.getJoinTable(), true, true, null);
            boolean hasPostReference = joinSpec.getJoinTable().hasPostReference();
            if (hasPostReference) {
                tables[i] = subContexts[i].getResolver().getTables().get(0).getTable();
                projectedTable = JoinCompiler.joinProjectedTables(projectedTable, tables[i], joinSpec.getType());
            } else {
                tables[i] = null;
            }
        }
        for (int i = 0; i < count; i++) {
            JoinSpec joinSpec = joinSpecs.get(i);
            context.setResolver(FromCompiler.getResolverForProjectedTable(projectedTable, context.getConnection(), query.getUdfParseNodes()));
            // place-holder
            joinIds[i] = new ImmutableBytesPtr(emptyByteArray);
            Pair<List<Expression>, List<Expression>> joinConditions = joinSpec.compileJoinConditions(context, subContexts[i], true);
            joinExpressions[i] = joinConditions.getFirst();
            List<Expression> hashExpressions = joinConditions.getSecond();
            Pair<Expression, Expression> keyRangeExpressions = new Pair<Expression, Expression>(null, null);
            boolean optimized = getKeyExpressionCombinations(keyRangeExpressions, context, joinTable.getStatement(), tableRef, joinSpec.getType(), joinExpressions[i], hashExpressions);
            Expression keyRangeLhsExpression = keyRangeExpressions.getFirst();
            Expression keyRangeRhsExpression = keyRangeExpressions.getSecond();
            joinTypes[i] = joinSpec.getType();
            if (i < count - 1) {
                fieldPositions[i + 1] = fieldPositions[i] + (tables[i] == null ? 0 : (tables[i].getColumns().size() - tables[i].getPKColumns().size()));
            }
            hashPlans[i] = new HashSubPlan(i, subPlans[i], optimized ? null : hashExpressions, joinSpec.isSingleValueOnly(), keyRangeLhsExpression, keyRangeRhsExpression);
        }
        TupleProjector.serializeProjectorIntoScan(context.getScan(), tupleProjector);
        QueryPlan plan = compileSingleFlatQuery(context, query, binds, asSubquery, !asSubquery && joinTable.isAllLeftJoin(), null, !table.isSubselect() && projectPKColumns ? tupleProjector : null, true);
        Expression postJoinFilterExpression = joinTable.compilePostFilterExpression(context, table);
        Integer limit = null;
        Integer offset = null;
        if (!query.isAggregate() && !query.isDistinct() && query.getOrderBy().isEmpty()) {
            limit = plan.getLimit();
            offset = plan.getOffset();
        }
        HashJoinInfo joinInfo = new HashJoinInfo(projectedTable, joinIds, joinExpressions, joinTypes, starJoinVector, tables, fieldPositions, postJoinFilterExpression, QueryUtil.getOffsetLimit(limit, offset));
        return HashJoinPlan.create(joinTable.getStatement(), plan, joinInfo, hashPlans);
    }
    JoinSpec lastJoinSpec = joinSpecs.get(joinSpecs.size() - 1);
    JoinType type = lastJoinSpec.getType();
    if (!this.useSortMergeJoin && (type == JoinType.Right || type == JoinType.Inner) && lastJoinSpec.getJoinTable().getJoinSpecs().isEmpty() && lastJoinSpec.getJoinTable().getTable().isFlat()) {
        JoinTable rhsJoinTable = lastJoinSpec.getJoinTable();
        Table rhsTable = rhsJoinTable.getTable();
        JoinTable lhsJoin = joinTable.getSubJoinTableWithoutPostFilters();
        Scan subScan = ScanUtil.newScan(originalScan);
        StatementContext lhsCtx = new StatementContext(statement, context.getResolver(), subScan, new SequenceManager(statement));
        QueryPlan lhsPlan = compileJoinQuery(lhsCtx, binds, lhsJoin, true, true, null);
        PTable rhsProjTable;
        TableRef rhsTableRef;
        SelectStatement rhs;
        TupleProjector tupleProjector;
        if (!rhsTable.isSubselect()) {
            context.setCurrentTable(rhsTable.getTableRef());
            rhsProjTable = rhsTable.createProjectedTable(!projectPKColumns, context);
            rhsTableRef = rhsTable.getTableRef();
            rhsTable.projectColumns(context.getScan());
            rhs = rhsJoinTable.getAsSingleSubquery(rhsTable.getAsSubquery(orderBy), asSubquery);
            tupleProjector = new TupleProjector(rhsProjTable);
        } else {
            SelectStatement subquery = rhsTable.getAsSubquery(orderBy);
            QueryPlan plan = compileSubquery(subquery, false);
            rhsProjTable = rhsTable.createProjectedTable(plan.getProjector());
            rhsTableRef = plan.getTableRef();
            context.getScan().setFamilyMap(plan.getContext().getScan().getFamilyMap());
            rhs = rhsJoinTable.getAsSingleSubquery((SelectStatement) plan.getStatement(), asSubquery);
            tupleProjector = new TupleProjector(plan.getProjector());
        }
        context.setCurrentTable(rhsTableRef);
        context.setResolver(FromCompiler.getResolverForProjectedTable(rhsProjTable, context.getConnection(), rhs.getUdfParseNodes()));
        ImmutableBytesPtr[] joinIds = new ImmutableBytesPtr[] { new ImmutableBytesPtr(emptyByteArray) };
        Pair<List<Expression>, List<Expression>> joinConditions = lastJoinSpec.compileJoinConditions(lhsCtx, context, true);
        List<Expression> joinExpressions = joinConditions.getSecond();
        List<Expression> hashExpressions = joinConditions.getFirst();
        boolean needsMerge = lhsJoin.hasPostReference();
        PTable lhsTable = needsMerge ? lhsCtx.getResolver().getTables().get(0).getTable() : null;
        int fieldPosition = needsMerge ? rhsProjTable.getColumns().size() - rhsProjTable.getPKColumns().size() : 0;
        PTable projectedTable = needsMerge ? JoinCompiler.joinProjectedTables(rhsProjTable, lhsTable, type == JoinType.Right ? JoinType.Left : type) : rhsProjTable;
        TupleProjector.serializeProjectorIntoScan(context.getScan(), tupleProjector);
        context.setResolver(FromCompiler.getResolverForProjectedTable(projectedTable, context.getConnection(), rhs.getUdfParseNodes()));
        QueryPlan rhsPlan = compileSingleFlatQuery(context, rhs, binds, asSubquery, !asSubquery && type == JoinType.Right, null, !rhsTable.isSubselect() && projectPKColumns ? tupleProjector : null, true);
        Expression postJoinFilterExpression = joinTable.compilePostFilterExpression(context, rhsTable);
        Integer limit = null;
        Integer offset = null;
        if (!rhs.isAggregate() && !rhs.isDistinct() && rhs.getOrderBy().isEmpty()) {
            limit = rhsPlan.getLimit();
            offset = rhsPlan.getOffset();
        }
        HashJoinInfo joinInfo = new HashJoinInfo(projectedTable, joinIds, new List[] { joinExpressions }, new JoinType[] { type == JoinType.Right ? JoinType.Left : type }, new boolean[] { true }, new PTable[] { lhsTable }, new int[] { fieldPosition }, postJoinFilterExpression, QueryUtil.getOffsetLimit(limit, offset));
        Pair<Expression, Expression> keyRangeExpressions = new Pair<Expression, Expression>(null, null);
        getKeyExpressionCombinations(keyRangeExpressions, context, joinTable.getStatement(), rhsTableRef, type, joinExpressions, hashExpressions);
        return HashJoinPlan.create(joinTable.getStatement(), rhsPlan, joinInfo, new HashSubPlan[] { new HashSubPlan(0, lhsPlan, hashExpressions, false, keyRangeExpressions.getFirst(), keyRangeExpressions.getSecond()) });
    }
    JoinTable lhsJoin = joinTable.getSubJoinTableWithoutPostFilters();
    JoinTable rhsJoin = lastJoinSpec.getJoinTable();
    if (type == JoinType.Right) {
        JoinTable temp = lhsJoin;
        lhsJoin = rhsJoin;
        rhsJoin = temp;
    }
    List<EqualParseNode> joinConditionNodes = lastJoinSpec.getOnConditions();
    List<OrderByNode> lhsOrderBy = Lists.<OrderByNode>newArrayListWithExpectedSize(joinConditionNodes.size());
    List<OrderByNode> rhsOrderBy = Lists.<OrderByNode>newArrayListWithExpectedSize(joinConditionNodes.size());
    for (EqualParseNode condition : joinConditionNodes) {
        lhsOrderBy.add(NODE_FACTORY.orderBy(type == JoinType.Right ? condition.getRHS() : condition.getLHS(), false, true));
        rhsOrderBy.add(NODE_FACTORY.orderBy(type == JoinType.Right ? condition.getLHS() : condition.getRHS(), false, true));
    }
    Scan lhsScan = ScanUtil.newScan(originalScan);
    StatementContext lhsCtx = new StatementContext(statement, context.getResolver(), lhsScan, new SequenceManager(statement));
    boolean preserveRowkey = !projectPKColumns && type != JoinType.Full;
    QueryPlan lhsPlan = compileJoinQuery(lhsCtx, binds, lhsJoin, true, !preserveRowkey, lhsOrderBy);
    PTable lhsProjTable = lhsCtx.getResolver().getTables().get(0).getTable();
    boolean isInRowKeyOrder = preserveRowkey && lhsPlan.getOrderBy().getOrderByExpressions().isEmpty();
    Scan rhsScan = ScanUtil.newScan(originalScan);
    StatementContext rhsCtx = new StatementContext(statement, context.getResolver(), rhsScan, new SequenceManager(statement));
    QueryPlan rhsPlan = compileJoinQuery(rhsCtx, binds, rhsJoin, true, true, rhsOrderBy);
    PTable rhsProjTable = rhsCtx.getResolver().getTables().get(0).getTable();
    Pair<List<Expression>, List<Expression>> joinConditions = lastJoinSpec.compileJoinConditions(type == JoinType.Right ? rhsCtx : lhsCtx, type == JoinType.Right ? lhsCtx : rhsCtx, false);
    List<Expression> lhsKeyExpressions = type == JoinType.Right ? joinConditions.getSecond() : joinConditions.getFirst();
    List<Expression> rhsKeyExpressions = type == JoinType.Right ? joinConditions.getFirst() : joinConditions.getSecond();
    boolean needsMerge = rhsJoin.hasPostReference();
    int fieldPosition = needsMerge ? lhsProjTable.getColumns().size() - lhsProjTable.getPKColumns().size() : 0;
    PTable projectedTable = needsMerge ? JoinCompiler.joinProjectedTables(lhsProjTable, rhsProjTable, type == JoinType.Right ? JoinType.Left : type) : lhsProjTable;
    ColumnResolver resolver = FromCompiler.getResolverForProjectedTable(projectedTable, context.getConnection(), joinTable.getStatement().getUdfParseNodes());
    TableRef tableRef = resolver.getTables().get(0);
    StatementContext subCtx = new StatementContext(statement, resolver, ScanUtil.newScan(originalScan), new SequenceManager(statement));
    subCtx.setCurrentTable(tableRef);
    QueryPlan innerPlan = new SortMergeJoinPlan(subCtx, joinTable.getStatement(), tableRef, type == JoinType.Right ? JoinType.Left : type, lhsPlan, rhsPlan, lhsKeyExpressions, rhsKeyExpressions, projectedTable, lhsProjTable, needsMerge ? rhsProjTable : null, fieldPosition, lastJoinSpec.isSingleValueOnly());
    context.setCurrentTable(tableRef);
    context.setResolver(resolver);
    TableNode from = NODE_FACTORY.namedTable(tableRef.getTableAlias(), NODE_FACTORY.table(tableRef.getTable().getSchemaName().getString(), tableRef.getTable().getTableName().getString()));
    ParseNode where = joinTable.getPostFiltersCombined();
    SelectStatement select = asSubquery ? NODE_FACTORY.select(from, joinTable.getStatement().getHint(), false, Collections.<AliasedNode>emptyList(), where, null, null, orderBy, null, null, 0, false, joinTable.getStatement().hasSequence(), Collections.<SelectStatement>emptyList(), joinTable.getStatement().getUdfParseNodes()) : NODE_FACTORY.select(joinTable.getStatement(), from, where);
    return compileSingleFlatQuery(context, select, binds, asSubquery, false, innerPlan, null, isInRowKeyOrder);
}