Examples with ScanResult herddb.model.ScanResult used on opensource projects

Example 16 with ScanResult

use of herddb.model.ScanResult in project herddb by diennea.

the class ProjectOp method execute.

@Override
public StatementExecutionResult execute(TableSpaceManager tableSpaceManager, TransactionContext transactionContext, StatementEvaluationContext context, boolean lockRequired, boolean forWrite) throws StatementExecutionException {
    // TODO merge projection + scan + sort + limit
    StatementExecutionResult input = this.input.execute(tableSpaceManager, transactionContext, context, lockRequired, forWrite);
    ScanResult downstream = (ScanResult) input;
    DataScanner dataScanner = downstream.dataScanner;
    DataScanner projected = new ProjectedDataScanner(dataScanner, projection.getFieldNames(), projection.getColumns(), context);
    return new ScanResult(downstream.transactionId, projected);
}

Example 17 with ScanResult

use of herddb.model.ScanResult in project herddb by diennea.

the class SortOp method execute.

@Override
public StatementExecutionResult execute(TableSpaceManager tableSpaceManager, TransactionContext transactionContext, StatementEvaluationContext context, boolean lockRequired, boolean forWrite) throws StatementExecutionException {
    // TODO merge projection + scan + sort + limit
    StatementExecutionResult input = this.input.execute(tableSpaceManager, transactionContext, context, lockRequired, forWrite);
    ScanResult downstreamScanResult = (ScanResult) input;
    final DataScanner inputScanner = downstreamScanResult.dataScanner;
    try (DataScanner dataScanner = inputScanner) {
        MaterializedRecordSet recordSet = tableSpaceManager.getDbmanager().getRecordSetFactory().createRecordSet(inputScanner.getFieldNames(), inputScanner.getSchema());
        while (dataScanner.hasNext()) {
            DataAccessor row = dataScanner.next();
            recordSet.add(row);
        }
        recordSet.writeFinished();
        recordSet.sort(this);
        SimpleDataScanner result = new SimpleDataScanner(downstreamScanResult.transactionId, recordSet);
        return new ScanResult(downstreamScanResult.transactionId, result);
    } catch (DataScannerException ex) {
        throw new StatementExecutionException(ex);
    }
}

Example 18 with ScanResult

use of herddb.model.ScanResult in project herddb by diennea.

the class AggregateOp method execute.

@Override
public StatementExecutionResult execute(TableSpaceManager tableSpaceManager, TransactionContext transactionContext, StatementEvaluationContext context, boolean lockRequired, boolean forWrite) throws StatementExecutionException {
    StatementExecutionResult input = this.input.execute(tableSpaceManager, transactionContext, context, lockRequired, forWrite);
    ScanResult downstreamScanResult = (ScanResult) input;
    final DataScanner inputScanner = downstreamScanResult.dataScanner;
    AggregatedDataScanner filtered = new AggregatedDataScanner(inputScanner, context, tableSpaceManager.getDbmanager().getRecordSetFactory());
    return new ScanResult(downstreamScanResult.transactionId, filtered);
}