ShowCreateLoadCommand.java

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// 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.catalog.Column;
import org.apache.doris.catalog.DatabaseIf;
import org.apache.doris.catalog.Env;
import org.apache.doris.catalog.ScalarType;
import org.apache.doris.common.AnalysisException;
import org.apache.doris.common.DdlException;
import org.apache.doris.common.ErrorCode;
import org.apache.doris.common.ErrorReport;
import org.apache.doris.common.Pair;
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.commands.info.LabelNameInfo;
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.List;
import java.util.stream.Collectors;

/**
 * Represents the SHOW CREATE LOAD command.
 */
public class ShowCreateLoadCommand extends ShowCommand {
    private static final ShowResultSetMetaData META_DATA =
            ShowResultSetMetaData.builder()
                    .addColumn(new Column("JobId", ScalarType.createVarchar(128)))
                    .addColumn(new Column("CreateStmt", ScalarType.createVarchar(65535)))
                    .build();
    private static final Logger LOG = LogManager.getLogger(ShowCreateLoadCommand.class);

    private final LabelNameInfo label;

    public ShowCreateLoadCommand(LabelNameInfo label) {
        super(PlanType.SHOW_CREATE_LOAD_COMMAND);
        this.label = label;
    }

    private void validate(ConnectContext ctx) throws AnalysisException {
        if (!Env.getCurrentEnv().getAccessManager().checkGlobalPriv(ConnectContext.get(), PrivPredicate.ADMIN)
                && !Env.getCurrentEnv().getAccessManager().checkGlobalPriv(ConnectContext.get(),
                PrivPredicate.OPERATOR)) {
            ErrorReport.reportAnalysisException(ErrorCode.ERR_SPECIFIC_ACCESS_DENIED_ERROR, "ADMIN/OPERATOR");
        }

        label.validate(ctx);
    }

    @Override
    public ShowResultSet doRun(ConnectContext ctx, StmtExecutor executor) throws Exception {
        validate(ctx);
        List<List<String>> rows = Lists.newArrayList();
        String labelName = label.getLabel();

        Util.prohibitExternalCatalog(ctx.getDefaultCatalog(), this.getClass().getSimpleName());
        Env env = ctx.getEnv();
        DatabaseIf db = ctx.getCurrentCatalog().getDbOrAnalysisException(label.getDb());
        long dbId = db.getId();
        try {
            List<Pair<Long, String>> result = env.getLoadManager().getCreateLoadStmt(dbId, labelName);
            rows.addAll(result.stream().map(pair -> Lists.newArrayList(String.valueOf(pair.first), pair.second))
                    .collect(Collectors.toList()));
        } catch (DdlException e) {
            LOG.warn(e.getMessage(), e);
            throw new AnalysisException(e.getMessage());
        }
        return new ShowResultSet(META_DATA, rows);
    }

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

    @Override
    public ShowResultSetMetaData getMetaData() {
        return META_DATA;
    }
}