Examples with DUMMY_OFFLOADED io.prestosql.plugin.hive.HiveColumnHandle.ColumnType.DUMMY_OFFLOADED used on opensource projects

Example 1 with DUMMY_OFFLOADED

use of io.prestosql.plugin.hive.HiveColumnHandle.ColumnType.DUMMY_OFFLOADED in project boostkit-bigdata by kunpengcompute.

the class HiveProjectPushdown method tryProjectPushdown.

protected static Optional<TableScanNode> tryProjectPushdown(ProjectNode plan, Map<String, Type> types) {
    if (!(plan.getSource() instanceof TableScanNode)) {
        return Optional.empty();
    }
    TableScanNode tableScanNode = (TableScanNode) plan.getSource();
    ConnectorTableHandle tableHandle = tableScanNode.getTable().getConnectorHandle();
    if (!(tableHandle instanceof HiveTableHandle) || !(((HiveTableHandle) tableHandle).getOffloadExpression().getProjections().isEmpty())) {
        return Optional.empty();
    }
    Map<Symbol, ColumnHandle> assignments = new HashMap<>();
    HiveTypeTranslator hiveTypeTranslator = new HiveTypeTranslator();
    for (Map.Entry<Symbol, RowExpression> entry : plan.getAssignments().entrySet()) {
        String name = entry.getKey().getName();
        HiveType hiveType = HiveType.toHiveType(hiveTypeTranslator, entry.getValue().getType());
        TypeSignature typeSignature = entry.getValue().getType().getTypeSignature();
        HiveColumnHandle columnHandle = new HiveColumnHandle(name, hiveType, typeSignature, DUMMY_OFFLOADED_COLUMN_INDEX, DUMMY_OFFLOADED, Optional.of("projections pushed down " + name));
        assignments.put(entry.getKey(), columnHandle);
    }
    BiMap<VariableReferenceExpression, VariableReferenceExpression> variableToColumnMapping = tableScanNode.getAssignments().entrySet().stream().collect(toImmutableBiMap(entry -> new VariableReferenceExpression(entry.getKey().getName(), types.get(entry.getKey().getName())), entry -> new VariableReferenceExpression(entry.getValue().getColumnName(), types.get(entry.getKey().getName()))));
    ImmutableMap.Builder<Symbol, RowExpression> projections = new ImmutableMap.Builder<>();
    for (Map.Entry<Symbol, RowExpression> entry : plan.getAssignments().getMap().entrySet()) {
        RowExpression expression = replaceExpression(entry.getValue(), variableToColumnMapping);
        if (!OmniExpressionChecker.checkExpression(expression)) {
            return Optional.empty();
        }
        projections.put(entry.getKey(), expression);
    }
    HiveTableHandle hiveTableHandle = (HiveTableHandle) tableHandle;
    HiveOffloadExpression offloadExpression = hiveTableHandle.getOffloadExpression().updateProjections(projections.build(), getDataSourceColumns(tableScanNode));
    HiveTableHandle newHiveTableHandle = hiveTableHandle.withOffloadExpression(offloadExpression);
    TableHandle newTableHandle = new TableHandle(tableScanNode.getTable().getCatalogName(), newHiveTableHandle, tableScanNode.getTable().getTransaction(), tableScanNode.getTable().getLayout());
    return Optional.of(new TableScanNode(tableScanNode.getId(), newTableHandle, ImmutableList.copyOf(assignments.keySet()), assignments, tableScanNode.getEnforcedConstraint(), tableScanNode.getPredicate(), tableScanNode.getStrategy(), tableScanNode.getReuseTableScanMappingId(), tableScanNode.getConsumerTableScanNodeCount(), tableScanNode.isForDelete()));
}