Examples with H2FieldsIterator org.apache.ignite.internal.processors.query.h2.H2FieldsIterator used on opensource projects

Example 1 with H2FieldsIterator

use of org.apache.ignite.internal.processors.query.h2.H2FieldsIterator in project ignite by apache.

the class IgniteH2Indexing method queryLocalSqlFields.

/**
     * Queries individual fields (generally used by JDBC drivers).
     *
     * @param schemaName Schema name.
     * @param qry Query.
     * @param params Query parameters.
     * @param filter Cache name and key filter.
     * @param enforceJoinOrder Enforce join order of tables in the query.
     * @param timeout Query timeout in milliseconds.
     * @param cancel Query cancel.
     * @return Query result.
     * @throws IgniteCheckedException If failed.
     */
@SuppressWarnings("unchecked")
public GridQueryFieldsResult queryLocalSqlFields(final String schemaName, final String qry, @Nullable final Collection<Object> params, final IndexingQueryFilter filter, boolean enforceJoinOrder, final int timeout, final GridQueryCancel cancel) throws IgniteCheckedException {
    final Connection conn = connectionForSchema(schemaName);
    H2Utils.setupConnection(conn, false, enforceJoinOrder);
    final PreparedStatement stmt = preparedStatementWithParams(conn, qry, params, true);
    Prepared p = GridSqlQueryParser.prepared(stmt);
    if (DmlStatementsProcessor.isDmlStatement(p)) {
        SqlFieldsQuery fldsQry = new SqlFieldsQuery(qry);
        if (params != null)
            fldsQry.setArgs(params.toArray());
        fldsQry.setEnforceJoinOrder(enforceJoinOrder);
        fldsQry.setTimeout(timeout, TimeUnit.MILLISECONDS);
        return dmlProc.updateSqlFieldsLocal(schemaName, stmt, fldsQry, filter, cancel);
    } else if (DdlStatementsProcessor.isDdlStatement(p))
        throw new IgniteSQLException("DDL statements are supported for the whole cluster only", IgniteQueryErrorCode.UNSUPPORTED_OPERATION);
    List<GridQueryFieldMetadata> meta;
    try {
        meta = H2Utils.meta(stmt.getMetaData());
    } catch (SQLException e) {
        throw new IgniteCheckedException("Cannot prepare query metadata", e);
    }
    final GridH2QueryContext ctx = new GridH2QueryContext(nodeId, nodeId, 0, LOCAL).filter(filter).distributedJoinMode(OFF);
    return new GridQueryFieldsResultAdapter(meta, null) {

        @Override
        public GridCloseableIterator<List<?>> iterator() throws IgniteCheckedException {
            assert GridH2QueryContext.get() == null;
            GridH2QueryContext.set(ctx);
            GridRunningQueryInfo run = new GridRunningQueryInfo(qryIdGen.incrementAndGet(), qry, SQL_FIELDS, schemaName, U.currentTimeMillis(), cancel, true);
            runs.putIfAbsent(run.id(), run);
            try {
                ResultSet rs = executeSqlQueryWithTimer(stmt, conn, qry, params, timeout, cancel);
                return new H2FieldsIterator(rs);
            } finally {
                GridH2QueryContext.clearThreadLocal();
                runs.remove(run.id());
            }
        }
    };
}

Example 2 with H2FieldsIterator

use of org.apache.ignite.internal.processors.query.h2.H2FieldsIterator in project ignite by apache.

the class GridReduceQueryExecutor method query.

/**
     * @param schemaName Schema name.
     * @param qry Query.
     * @param keepBinary Keep binary.
     * @param enforceJoinOrder Enforce join order of tables.
     * @param timeoutMillis Timeout in milliseconds.
     * @param cancel Query cancel.
     * @param params Query parameters.
     * @param parts Partitions.
     * @return Rows iterator.
     */
public Iterator<List<?>> query(String schemaName, GridCacheTwoStepQuery qry, boolean keepBinary, boolean enforceJoinOrder, int timeoutMillis, GridQueryCancel cancel, Object[] params, final int[] parts) {
    if (F.isEmpty(params))
        params = EMPTY_PARAMS;
    final boolean isReplicatedOnly = qry.isReplicatedOnly();
    // Fail if all caches are replicated and explicit partitions are set.
    for (int attempt = 0; ; attempt++) {
        if (attempt != 0) {
            try {
                // Wait for exchange.
                Thread.sleep(attempt * 10);
            } catch (InterruptedException e) {
                Thread.currentThread().interrupt();
                throw new CacheException("Query was interrupted.", e);
            }
        }
        final long qryReqId = qryIdGen.incrementAndGet();
        final ReduceQueryRun r = new ReduceQueryRun(qryReqId, qry.originalSql(), schemaName, h2.connectionForSchema(schemaName), qry.mapQueries().size(), qry.pageSize(), U.currentTimeMillis(), cancel);
        AffinityTopologyVersion topVer = h2.readyTopologyVersion();
        List<Integer> cacheIds = qry.cacheIds();
        Collection<ClusterNode> nodes = null;
        // Explicit partition mapping for unstable topology.
        Map<ClusterNode, IntArray> partsMap = null;
        // Explicit partitions mapping for query.
        Map<ClusterNode, IntArray> qryMap = null;
        // Partitions are not supported for queries over all replicated caches.
        if (parts != null) {
            boolean replicatedOnly = true;
            for (Integer cacheId : cacheIds) {
                if (!cacheContext(cacheId).isReplicated()) {
                    replicatedOnly = false;
                    break;
                }
            }
            if (replicatedOnly)
                throw new CacheException("Partitions are not supported for replicated caches");
        }
        if (qry.isLocal())
            nodes = singletonList(ctx.discovery().localNode());
        else {
            if (isPreloadingActive(cacheIds)) {
                if (isReplicatedOnly)
                    nodes = replicatedUnstableDataNodes(cacheIds);
                else {
                    partsMap = partitionedUnstableDataNodes(cacheIds);
                    if (partsMap != null) {
                        qryMap = narrowForQuery(partsMap, parts);
                        nodes = qryMap == null ? null : qryMap.keySet();
                    }
                }
            } else {
                qryMap = stableDataNodes(isReplicatedOnly, topVer, cacheIds, parts);
                if (qryMap != null)
                    nodes = qryMap.keySet();
            }
            if (nodes == null)
                // Retry.
                continue;
            assert !nodes.isEmpty();
            if (isReplicatedOnly || qry.explain()) {
                ClusterNode locNode = ctx.discovery().localNode();
                // Always prefer local node if possible.
                if (nodes.contains(locNode))
                    nodes = singletonList(locNode);
                else {
                    // Select random data node to run query on a replicated data or
                    // get EXPLAIN PLAN from a single node.
                    nodes = singletonList(F.rand(nodes));
                }
            }
        }
        int tblIdx = 0;
        final boolean skipMergeTbl = !qry.explain() && qry.skipMergeTable();
        final int segmentsPerIndex = qry.explain() || isReplicatedOnly ? 1 : findFirstPartitioned(cacheIds).config().getQueryParallelism();
        int replicatedQrysCnt = 0;
        for (GridCacheSqlQuery mapQry : qry.mapQueries()) {
            GridMergeIndex idx;
            if (!skipMergeTbl) {
                GridMergeTable tbl;
                try {
                    tbl = createMergeTable(r.connection(), mapQry, qry.explain());
                } catch (IgniteCheckedException e) {
                    throw new IgniteException(e);
                }
                idx = tbl.getMergeIndex();
                fakeTable(r.connection(), tblIdx++).innerTable(tbl);
            } else
                idx = GridMergeIndexUnsorted.createDummy(ctx);
            // If the query has only replicated tables, we have to run it on a single node only.
            if (!mapQry.isPartitioned()) {
                ClusterNode node = F.rand(nodes);
                mapQry.node(node.id());
                replicatedQrysCnt++;
                // Replicated tables can have only 1 segment.
                idx.setSources(singletonList(node), 1);
            } else
                idx.setSources(nodes, segmentsPerIndex);
            idx.setPageSize(r.pageSize());
            r.indexes().add(idx);
        }
        r.latch(new CountDownLatch(isReplicatedOnly ? 1 : (r.indexes().size() - replicatedQrysCnt) * nodes.size() * segmentsPerIndex + replicatedQrysCnt));
        runs.put(qryReqId, r);
        try {
            cancel.checkCancelled();
            if (ctx.clientDisconnected()) {
                throw new CacheException("Query was cancelled, client node disconnected.", new IgniteClientDisconnectedException(ctx.cluster().clientReconnectFuture(), "Client node disconnected."));
            }
            List<GridCacheSqlQuery> mapQrys = qry.mapQueries();
            if (qry.explain()) {
                mapQrys = new ArrayList<>(qry.mapQueries().size());
                for (GridCacheSqlQuery mapQry : qry.mapQueries()) mapQrys.add(new GridCacheSqlQuery("EXPLAIN " + mapQry.query()).parameterIndexes(mapQry.parameterIndexes()));
            }
            final boolean distributedJoins = qry.distributedJoins();
            final Collection<ClusterNode> finalNodes = nodes;
            cancel.set(new Runnable() {

                @Override
                public void run() {
                    send(finalNodes, new GridQueryCancelRequest(qryReqId), null, false);
                }
            });
            boolean retry = false;
            // Always enforce join order on map side to have consistent behavior.
            int flags = GridH2QueryRequest.FLAG_ENFORCE_JOIN_ORDER;
            if (distributedJoins)
                flags |= GridH2QueryRequest.FLAG_DISTRIBUTED_JOINS;
            if (qry.isLocal())
                flags |= GridH2QueryRequest.FLAG_IS_LOCAL;
            if (qry.explain())
                flags |= GridH2QueryRequest.FLAG_EXPLAIN;
            if (isReplicatedOnly)
                flags |= GridH2QueryRequest.FLAG_REPLICATED;
            GridH2QueryRequest req = new GridH2QueryRequest().requestId(qryReqId).topologyVersion(topVer).pageSize(r.pageSize()).caches(qry.cacheIds()).tables(distributedJoins ? qry.tables() : null).partitions(convert(partsMap)).queries(mapQrys).parameters(params).flags(flags).timeout(timeoutMillis).schemaName(schemaName);
            if (send(nodes, req, parts == null ? null : new ExplicitPartitionsSpecializer(qryMap), false)) {
                awaitAllReplies(r, nodes, cancel);
                Object state = r.state();
                if (state != null) {
                    if (state instanceof CacheException) {
                        CacheException err = (CacheException) state;
                        if (err.getCause() instanceof IgniteClientDisconnectedException)
                            throw err;
                        if (wasCancelled(err))
                            // Throw correct exception.
                            throw new QueryCancelledException();
                        throw new CacheException("Failed to run map query remotely.", err);
                    }
                    if (state instanceof AffinityTopologyVersion) {
                        retry = true;
                        // If remote node asks us to retry then we have outdated full partition map.
                        h2.awaitForReadyTopologyVersion((AffinityTopologyVersion) state);
                    }
                }
            } else
                // Send failed.
                retry = true;
            Iterator<List<?>> resIter = null;
            if (!retry) {
                if (skipMergeTbl) {
                    List<List<?>> res = new ArrayList<>();
                    // Simple UNION ALL can have multiple indexes.
                    for (GridMergeIndex idx : r.indexes()) {
                        Cursor cur = idx.findInStream(null, null);
                        while (cur.next()) {
                            Row row = cur.get();
                            int cols = row.getColumnCount();
                            List<Object> resRow = new ArrayList<>(cols);
                            for (int c = 0; c < cols; c++) resRow.add(row.getValue(c).getObject());
                            res.add(resRow);
                        }
                    }
                    resIter = res.iterator();
                } else {
                    cancel.checkCancelled();
                    UUID locNodeId = ctx.localNodeId();
                    H2Utils.setupConnection(r.connection(), false, enforceJoinOrder);
                    GridH2QueryContext.set(new GridH2QueryContext(locNodeId, locNodeId, qryReqId, REDUCE).pageSize(r.pageSize()).distributedJoinMode(OFF));
                    try {
                        if (qry.explain())
                            return explainPlan(r.connection(), qry, params);
                        GridCacheSqlQuery rdc = qry.reduceQuery();
                        ResultSet res = h2.executeSqlQueryWithTimer(r.connection(), rdc.query(), F.asList(rdc.parameters(params)), // The statement will cache some extra thread local objects.
                        false, timeoutMillis, cancel);
                        resIter = new H2FieldsIterator(res);
                    } finally {
                        GridH2QueryContext.clearThreadLocal();
                    }
                }
            }
            if (retry) {
                if (Thread.currentThread().isInterrupted())
                    throw new IgniteInterruptedCheckedException("Query was interrupted.");
                continue;
            }
            return new GridQueryCacheObjectsIterator(resIter, h2.objectContext(), keepBinary);
        } catch (IgniteCheckedException | RuntimeException e) {
            U.closeQuiet(r.connection());
            if (e instanceof CacheException) {
                if (wasCancelled((CacheException) e))
                    throw new CacheException("Failed to run reduce query locally.", new QueryCancelledException());
                throw (CacheException) e;
            }
            Throwable cause = e;
            if (e instanceof IgniteCheckedException) {
                Throwable disconnectedErr = ((IgniteCheckedException) e).getCause(IgniteClientDisconnectedException.class);
                if (disconnectedErr != null)
                    cause = disconnectedErr;
            }
            throw new CacheException("Failed to run reduce query locally.", cause);
        } finally {
            // Make sure any activity related to current attempt is cancelled.
            cancelRemoteQueriesIfNeeded(nodes, r, qryReqId, qry.distributedJoins());
            if (!runs.remove(qryReqId, r))
                U.warn(log, "Query run was already removed: " + qryReqId);
            if (!skipMergeTbl) {
                for (int i = 0, mapQrys = qry.mapQueries().size(); i < mapQrys; i++) // Drop all merge tables.
                fakeTable(null, i).innerTable(null);
            }
        }
    }
}