Examples with DelegateResultIterator org.apache.phoenix.iterate.DelegateResultIterator used on opensource projects

Example 1 with DelegateResultIterator

use of org.apache.phoenix.iterate.DelegateResultIterator in project phoenix by apache.

the class BaseQueryPlan method iterator.

public final ResultIterator iterator(final List<? extends SQLCloseable> dependencies, ParallelScanGrouper scanGrouper, Scan scan) throws SQLException {
    if (scan == null) {
        scan = context.getScan();
    }
    /*
		 * For aggregate queries, we still need to let the AggregationPlan to
		 * proceed so that we can give proper aggregates even if there are no
		 * row to be scanned.
		 */
    if (context.getScanRanges() == ScanRanges.NOTHING && !getStatement().isAggregate()) {
        return ResultIterator.EMPTY_ITERATOR;
    }
    if (tableRef == TableRef.EMPTY_TABLE_REF) {
        return newIterator(scanGrouper, scan);
    }
    // Set miscellaneous scan attributes. This is the last chance to set them before we
    // clone the scan for each parallelized chunk.
    TableRef tableRef = context.getCurrentTable();
    PTable table = tableRef.getTable();
    if (dynamicFilter != null) {
        WhereCompiler.compile(context, statement, null, Collections.singletonList(dynamicFilter), false, null);
    }
    if (OrderBy.REV_ROW_KEY_ORDER_BY.equals(orderBy)) {
        ScanUtil.setReversed(scan);
        // Hack for working around PHOENIX-3121 and HBASE-16296.
        // TODO: remove once PHOENIX-3121 and/or HBASE-16296 are fixed.
        int scannerCacheSize = context.getStatement().getFetchSize();
        if (limit != null && limit % scannerCacheSize == 0) {
            scan.setCaching(scannerCacheSize + 1);
        }
    }
    if (statement.getHint().hasHint(Hint.SMALL)) {
        scan.setSmall(true);
    }
    PhoenixConnection connection = context.getConnection();
    // set read consistency
    if (table.getType() != PTableType.SYSTEM) {
        scan.setConsistency(connection.getConsistency());
    }
    // TODO fix this in PHOENIX-2415 Support ROW_TIMESTAMP with transactional tables
    if (!table.isTransactional()) {
        // Get the time range of row_timestamp column
        TimeRange rowTimestampRange = context.getScanRanges().getRowTimestampRange();
        // Get the already existing time range on the scan.
        TimeRange scanTimeRange = scan.getTimeRange();
        Long scn = connection.getSCN();
        if (scn == null) {
            // If we haven't resolved the time at the beginning of compilation, don't
            // force the lookup on the server, but use HConstants.LATEST_TIMESTAMP instead.
            scn = tableRef.getTimeStamp();
            if (scn == QueryConstants.UNSET_TIMESTAMP) {
                scn = HConstants.LATEST_TIMESTAMP;
            }
        }
        try {
            TimeRange timeRangeToUse = ScanUtil.intersectTimeRange(rowTimestampRange, scanTimeRange, scn);
            if (timeRangeToUse == null) {
                return ResultIterator.EMPTY_ITERATOR;
            }
            scan.setTimeRange(timeRangeToUse.getMin(), timeRangeToUse.getMax());
        } catch (IOException e) {
            throw new RuntimeException(e);
        }
    }
    byte[] tenantIdBytes;
    if (table.isMultiTenant() == true) {
        tenantIdBytes = connection.getTenantId() == null ? null : ScanUtil.getTenantIdBytes(table.getRowKeySchema(), table.getBucketNum() != null, connection.getTenantId(), table.getViewIndexId() != null);
    } else {
        tenantIdBytes = connection.getTenantId() == null ? null : connection.getTenantId().getBytes();
    }
    ScanUtil.setTenantId(scan, tenantIdBytes);
    String customAnnotations = LogUtil.customAnnotationsToString(connection);
    ScanUtil.setCustomAnnotations(scan, customAnnotations == null ? null : customAnnotations.getBytes());
    // Set local index related scan attributes. 
    if (table.getIndexType() == IndexType.LOCAL) {
        ScanUtil.setLocalIndex(scan);
        Set<PColumn> dataColumns = context.getDataColumns();
        // project is not present in the index then we need to skip this plan.
        if (!dataColumns.isEmpty()) {
            // Set data columns to be join back from data table.
            PTable parentTable = context.getCurrentTable().getTable();
            String parentSchemaName = parentTable.getParentSchemaName().getString();
            String parentTableName = parentTable.getParentTableName().getString();
            final ParseNodeFactory FACTORY = new ParseNodeFactory();
            // TODO: is it necessary to re-resolve the table?
            TableRef dataTableRef = FromCompiler.getResolver(FACTORY.namedTable(null, TableName.create(parentSchemaName, parentTableName)), context.getConnection()).resolveTable(parentSchemaName, parentTableName);
            PTable dataTable = dataTableRef.getTable();
            // Set data columns to be join back from data table.
            serializeDataTableColumnsToJoin(scan, dataColumns, dataTable);
            KeyValueSchema schema = ProjectedColumnExpression.buildSchema(dataColumns);
            // Set key value schema of the data columns.
            serializeSchemaIntoScan(scan, schema);
            // Set index maintainer of the local index.
            serializeIndexMaintainerIntoScan(scan, dataTable);
            // Set view constants if exists.
            serializeViewConstantsIntoScan(scan, dataTable);
        }
    }
    if (LOG.isDebugEnabled()) {
        LOG.debug(LogUtil.addCustomAnnotations("Scan ready for iteration: " + scan, connection));
    }
    ResultIterator iterator = newIterator(scanGrouper, scan);
    iterator = dependencies.isEmpty() ? iterator : new DelegateResultIterator(iterator) {

        @Override
        public void close() throws SQLException {
            try {
                super.close();
            } finally {
                SQLCloseables.closeAll(dependencies);
            }
        }
    };
    if (LOG.isDebugEnabled()) {
        LOG.debug(LogUtil.addCustomAnnotations("Iterator ready: " + iterator, connection));
    }
    // wrap the iterator so we start/end tracing as we expect
    TraceScope scope = Tracing.startNewSpan(context.getConnection(), "Creating basic query for " + getPlanSteps(iterator));
    return (scope.getSpan() != null) ? new TracingIterator(scope, iterator) : iterator;
}