ShowSmallFilesCommand.java

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// to you under the Apache License, Version 2.0 (the
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//
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package org.apache.doris.nereids.trees.plans.commands;

import org.apache.doris.catalog.Column;
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.datasource.InternalCatalog;
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.base.Strings;

import java.util.List;

/**
 * show small file command
 */
public class ShowSmallFilesCommand extends ShowCommand {
    private static final ShowResultSetMetaData META_DATA =
            ShowResultSetMetaData.builder()
                    .addColumn(new Column("Id", ScalarType.createVarchar(32)))
                    .addColumn(new Column("DbName", ScalarType.createVarchar(256)))
                    .addColumn(new Column("Catalog", ScalarType.createVarchar(32)))
                    .addColumn(new Column("FileName", ScalarType.createVarchar(16)))
                    .addColumn(new Column("FileSize", ScalarType.createVarchar(16)))
                    .addColumn(new Column("IsContent", ScalarType.createVarchar(16)))
                    .addColumn(new Column("MD5", ScalarType.createVarchar(16)))
                    .build();
    private String dbName; // if empty we will use current db;

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

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

    @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);
            }
        }
        if (!Env.getCurrentEnv().getAccessManager()
                .checkDbPriv(ConnectContext.get(), InternalCatalog.INTERNAL_CATALOG_NAME, dbName, PrivPredicate.SHOW)) {
            ErrorReport.reportAnalysisException(
                    ErrorCode.ERR_DBACCESS_DENIED_ERROR, ConnectContext.get().getQualifiedUser(), dbName);
        }

        List<List<String>> results;
        try {
            results = Env.getCurrentEnv().getSmallFileMgr().getInfo(dbName);
        } catch (DdlException e) {
            throw new AnalysisException(e.getMessage());
        }
        return new ShowResultSet(getMetaData(), results);
    }

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