ShowDeleteCommand.java

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// distributed with this work for additional information
// regarding copyright ownership.  The ASF licenses this file
// to you 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
//
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package org.apache.doris.nereids.trees.plans.commands;

import org.apache.doris.analysis.RedirectStatus;
import org.apache.doris.catalog.Column;
import org.apache.doris.catalog.Database;
import org.apache.doris.catalog.Env;
import org.apache.doris.catalog.ScalarType;
import org.apache.doris.common.ErrorCode;
import org.apache.doris.common.ErrorReport;
import org.apache.doris.common.proc.DeleteInfoProcDir;
import org.apache.doris.load.DeleteHandler;
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.base.Strings;
import com.google.common.collect.Lists;

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

/**
 * show delete command
 */
public class ShowDeleteCommand extends ShowCommand {
    private String dbName; // if not given use current.

    /**
     * constructor
     */
    public ShowDeleteCommand(String dbName) {
        super(PlanType.SHOW_DELETE_COMMAND);
        this.dbName = dbName;
    }

    @Override
    public ShowResultSet doRun(ConnectContext ctx, StmtExecutor executor) throws Exception {
        if (Strings.isNullOrEmpty(dbName)) {
            dbName = ctx.getDatabase();
            if (Strings.isNullOrEmpty(dbName)) {
                ErrorReport.reportAnalysisException(ErrorCode.ERR_NO_DB_ERROR);
            }
        }
        Env env = Env.getCurrentEnv();
        Database db = env.getInternalCatalog().getDbOrAnalysisException(dbName);
        long dbId = db.getId();

        DeleteHandler deleteHandler = env.getDeleteHandler();
        List<List<Comparable>> deleteInfos = deleteHandler.getDeleteInfosByDb(dbId);
        List<List<String>> rows = Lists.newArrayList();
        for (List<Comparable> deleteInfo : deleteInfos) {
            List<String> oneInfo = new ArrayList<String>(deleteInfo.size());
            for (Comparable element : deleteInfo) {
                oneInfo.add(element.toString());
            }
            rows.add(oneInfo);
        }
        return new ShowResultSet(getMetaData(), rows);
    }

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

    public ShowResultSetMetaData getMetaData() {
        ShowResultSetMetaData.Builder builder = ShowResultSetMetaData.builder();
        for (String title : DeleteInfoProcDir.TITLE_NAMES) {
            builder.addColumn(new Column(title, ScalarType.createVarchar(30)));
        }
        return builder.build();
    }

    @Override
    public RedirectStatus toRedirectStatus() {
        return RedirectStatus.FORWARD_NO_SYNC;
    }
}