ShowPartitionIdCommand.java

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// to you under the Apache License, Version 2.0 (the
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//
//   http://www.apache.org/licenses/LICENSE-2.0
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package org.apache.doris.nereids.trees.plans.commands;

import org.apache.doris.catalog.Column;
import org.apache.doris.catalog.Database;
import org.apache.doris.catalog.Env;
import org.apache.doris.catalog.OlapTable;
import org.apache.doris.catalog.Partition;
import org.apache.doris.catalog.ScalarType;
import org.apache.doris.catalog.Table;
import org.apache.doris.common.ErrorCode;
import org.apache.doris.common.ErrorReport;
import org.apache.doris.common.util.Util;
import org.apache.doris.mysql.privilege.PrivPredicate;
import org.apache.doris.nereids.trees.plans.PlanType;
import org.apache.doris.nereids.trees.plans.visitor.PlanVisitor;
import org.apache.doris.qe.ConnectContext;
import org.apache.doris.qe.ShowResultSet;
import org.apache.doris.qe.ShowResultSetMetaData;
import org.apache.doris.qe.StmtExecutor;

import com.google.common.collect.Lists;
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;

import java.util.ArrayList;
import java.util.List;

/**
 * show partition command
 */
public class ShowPartitionIdCommand extends ShowCommand {

    private static final Logger LOG = LogManager.getLogger(ShowPartitionIdCommand.class);

    private final long partitionId;

    /**
     * constructor
     */
    public ShowPartitionIdCommand(long partitionId) {
        super(PlanType.SHOW_PARTITIONID_COMMAND);
        this.partitionId = partitionId;
    }

    /**
     * get meta for show partionId
     */
    public ShowResultSetMetaData getMetaData() {
        ShowResultSetMetaData.Builder builder = ShowResultSetMetaData.builder();
        builder.addColumn(new Column("DbName", ScalarType.createVarchar(30)));
        builder.addColumn(new Column("TableName", ScalarType.createVarchar(30)));
        builder.addColumn(new Column("PartitionName", ScalarType.createVarchar(30)));
        builder.addColumn(new Column("DbId", ScalarType.createVarchar(30)));
        builder.addColumn(new Column("TableId", ScalarType.createVarchar(30)));
        return builder.build();
    }

    private ShowResultSet handleShowPartitionId(ConnectContext ctx, StmtExecutor executor) throws Exception {
        List<List<String>> rows = Lists.newArrayList();
        Env env = ctx.getEnv();
        List<Long> dbIds = env.getInternalCatalog().getDbIds();
        for (long dbId : dbIds) {
            Database database = env.getInternalCatalog().getDbNullable(dbId);
            if (database == null) {
                continue;
            }
            List<Table> tables = database.getTables();
            for (Table tbl : tables) {
                if (tbl instanceof OlapTable) {
                    tbl.readLock();
                    try {
                        Partition partition = ((OlapTable) tbl).getPartition(partitionId);
                        if (partition != null) {
                            List<String> row = new ArrayList<>();
                            row.add(database.getFullName());
                            if (tbl.isTemporary()) {
                                if (!Util.isTempTableInCurrentSession(tbl.getName())) {
                                    continue;
                                }
                                row.add(Util.getTempTableDisplayName(tbl.getName()));
                            } else {
                                row.add(tbl.getName());
                            }
                            row.add(partition.getName());
                            row.add(String.valueOf(database.getId()));
                            row.add(String.valueOf(tbl.getId()));
                            rows.add(row);
                            break;
                        }
                    } catch (Exception e) {
                        LOG.error("failed to get partition info for {}", partitionId, e);
                    } finally {
                        tbl.readUnlock();
                    }
                }
            }
        }
        ShowResultSet resultSet = new ShowResultSet(getMetaData(), rows);
        return resultSet;
    }

    @Override
    public ShowResultSet doRun(ConnectContext ctx, StmtExecutor executor) throws Exception {
        // check access first
        if (!Env.getCurrentEnv().getAccessManager().checkGlobalPriv(ConnectContext.get(), PrivPredicate.ADMIN)) {
            ErrorReport.reportAnalysisException(ErrorCode.ERR_SPECIFIC_ACCESS_DENIED_ERROR, "SHOW PARTITION");
        }
        return handleShowPartitionId(ctx, executor);
    }

    @Override
    public <R, C> R accept(PlanVisitor<R, C> visitor, C context) {
        return visitor.visitShowPartitionIdCommand(this, context);
    }
}