AddColumnTask.java

/*
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.facebook.presto.execution;

import com.facebook.presto.Session;
import com.facebook.presto.UnknownTypeException;
import com.facebook.presto.common.QualifiedObjectName;
import com.facebook.presto.common.type.Type;
import com.facebook.presto.metadata.Metadata;
import com.facebook.presto.spi.ColumnHandle;
import com.facebook.presto.spi.ColumnMetadata;
import com.facebook.presto.spi.ConnectorId;
import com.facebook.presto.spi.MaterializedViewDefinition;
import com.facebook.presto.spi.TableHandle;
import com.facebook.presto.spi.WarningCollector;
import com.facebook.presto.spi.security.AccessControl;
import com.facebook.presto.sql.analyzer.SemanticException;
import com.facebook.presto.sql.tree.AddColumn;
import com.facebook.presto.sql.tree.ColumnDefinition;
import com.facebook.presto.sql.tree.Expression;
import com.facebook.presto.sql.tree.Identifier;
import com.facebook.presto.transaction.TransactionManager;
import com.google.common.util.concurrent.ListenableFuture;

import java.util.List;
import java.util.Map;
import java.util.Optional;

import static com.facebook.presto.common.type.TypeSignature.parseTypeSignature;
import static com.facebook.presto.common.type.UnknownType.UNKNOWN;
import static com.facebook.presto.metadata.MetadataUtil.createQualifiedObjectName;
import static com.facebook.presto.metadata.MetadataUtil.getConnectorIdOrThrow;
import static com.facebook.presto.spi.connector.ConnectorCapabilities.NOT_NULL_COLUMN_CONSTRAINT;
import static com.facebook.presto.sql.NodeUtils.mapFromProperties;
import static com.facebook.presto.sql.analyzer.SemanticErrorCode.COLUMN_ALREADY_EXISTS;
import static com.facebook.presto.sql.analyzer.SemanticErrorCode.MISSING_TABLE;
import static com.facebook.presto.sql.analyzer.SemanticErrorCode.NOT_SUPPORTED;
import static com.facebook.presto.sql.analyzer.SemanticErrorCode.TYPE_MISMATCH;
import static com.facebook.presto.sql.analyzer.utils.ParameterUtils.parameterExtractor;
import static com.google.common.util.concurrent.Futures.immediateFuture;

public class AddColumnTask
        implements DDLDefinitionTask<AddColumn>
{
    @Override
    public String getName()
    {
        return "ADD COLUMN";
    }

    @Override
    public ListenableFuture<?> execute(AddColumn statement, TransactionManager transactionManager, Metadata metadata, AccessControl accessControl, Session session, List<Expression> parameters, WarningCollector warningCollector, String query)
    {
        QualifiedObjectName tableName = createQualifiedObjectName(session, statement, statement.getName(), metadata);
        Optional<TableHandle> tableHandle = metadata.getMetadataResolver(session).getTableHandle(tableName);
        if (!tableHandle.isPresent()) {
            if (!statement.isTableExists()) {
                throw new SemanticException(MISSING_TABLE, statement, "Table '%s' does not exist", tableName);
            }
            return immediateFuture(null);
        }

        Optional<MaterializedViewDefinition> optionalMaterializedView = metadata.getMetadataResolver(session).getMaterializedView(tableName);
        if (optionalMaterializedView.isPresent()) {
            if (!statement.isTableExists()) {
                throw new SemanticException(NOT_SUPPORTED, statement, "'%s' is a materialized view, and add column is not supported", tableName);
            }
            return immediateFuture(null);
        }

        ConnectorId connectorId = getConnectorIdOrThrow(session, metadata, tableName.getCatalogName());

        accessControl.checkCanAddColumns(session.getRequiredTransactionId(), session.getIdentity(), session.getAccessControlContext(), tableName);

        Map<String, ColumnHandle> columnHandles = metadata.getColumnHandles(session, tableHandle.get());

        ColumnDefinition element = statement.getColumn();
        Type type;
        try {
            type = metadata.getType(parseTypeSignature(element.getType()));
        }
        catch (IllegalArgumentException | UnknownTypeException e) {
            throw new SemanticException(TYPE_MISMATCH, element, "Unknown type '%s' for column '%s'", element.getType(), element.getName());
        }
        if (type.equals(UNKNOWN)) {
            throw new SemanticException(TYPE_MISMATCH, element, "Unknown type '%s' for column '%s'", element.getType(), element.getName());
        }
        if (columnHandles.containsKey(element.getName().getValueLowerCase())) {
            if (!statement.isColumnNotExists()) {
                throw new SemanticException(COLUMN_ALREADY_EXISTS, statement, "Column '%s' already exists", element.getName());
            }
            return immediateFuture(null);
        }
        if (!element.isNullable() && !metadata.getConnectorCapabilities(session, connectorId).contains(NOT_NULL_COLUMN_CONSTRAINT)) {
            throw new SemanticException(NOT_SUPPORTED, element, "Catalog '%s' does not support NOT NULL for column '%s'", connectorId.getCatalogName(), element.getName());
        }

        Map<String, Expression> sqlProperties = mapFromProperties(element.getProperties());
        Map<String, Object> columnProperties = metadata.getColumnPropertyManager().getProperties(
                connectorId,
                tableName.getCatalogName(),
                sqlProperties,
                session,
                metadata,
                parameterExtractor(statement, parameters));

        Identifier columnIdentifier = element.getName();
        String name = metadata.normalizeIdentifier(session, tableName.getCatalogName(), columnIdentifier.getValue());

        ColumnMetadata column = ColumnMetadata.builder()
                .setName(name)
                .setType(type)
                .setNullable(element.isNullable())
                .setComment(element.getComment().orElse(null))
                .setProperties(columnProperties)
                .build();

        metadata.addColumn(session, tableHandle.get(), column);

        return immediateFuture(null);
    }
}