AlterViewInfo.java

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

import org.apache.doris.analysis.AlterViewStmt;
import org.apache.doris.analysis.ColWithComment;
import org.apache.doris.analysis.TableName;
import org.apache.doris.catalog.DatabaseIf;
import org.apache.doris.catalog.Env;
import org.apache.doris.catalog.TableIf;
import org.apache.doris.catalog.View;
import org.apache.doris.common.ErrorCode;
import org.apache.doris.common.ErrorReport;
import org.apache.doris.common.FeNameFormat;
import org.apache.doris.common.UserException;
import org.apache.doris.common.util.Util;
import org.apache.doris.mysql.privilege.PrivPredicate;
import org.apache.doris.nereids.trees.expressions.Slot;
import org.apache.doris.nereids.util.PlanUtils;
import org.apache.doris.qe.ConnectContext;

import com.google.common.collect.Lists;

import java.util.List;

/** AlterViewInfo */
public class AlterViewInfo extends BaseViewInfo {

    private final String comment;

    /** constructor*/
    public AlterViewInfo(TableNameInfo viewName, String comment,
            String querySql, List<SimpleColumnDefinition> simpleColumnDefinitions) {
        super(viewName, querySql, simpleColumnDefinitions);
        this.comment = comment;
    }

    public AlterViewInfo(TableNameInfo viewName, String comment) {
        super(viewName, null, null);
        this.comment = comment;
    }

    /** init */
    public void init(ConnectContext ctx) throws UserException {
        if (viewName == null) {
            ErrorReport.reportAnalysisException(ErrorCode.ERR_NO_TABLES_USED);
        }
        viewName.analyze(ctx);
        FeNameFormat.checkTableName(viewName.getTbl());
        // disallow external catalog
        Util.prohibitExternalCatalog(viewName.getCtl(), "AlterViewStmt");

        DatabaseIf db = Env.getCurrentInternalCatalog().getDbOrAnalysisException(viewName.getDb());
        TableIf table = db.getTableOrAnalysisException(viewName.getTbl());
        if (!(table instanceof View)) {
            throw new org.apache.doris.common.AnalysisException(
                    String.format("ALTER VIEW not allowed on a table:%s.%s", viewName.getDb(), viewName.getTbl()));
        }

        // check privilege
        if (!Env.getCurrentEnv().getAccessManager().checkTblPriv(ctx, new TableName(viewName.getCtl(), viewName.getDb(),
                viewName.getTbl()), PrivPredicate.ALTER)) {
            ErrorReport.reportAnalysisException(ErrorCode.ERR_TABLE_ACCESS_DENIED_ERROR,
                    PrivPredicate.ALTER.getPrivs().toString(), viewName.getTbl());
        }
        if (querySql == null) {
            // Modify comment only.
            return;
        }
        analyzeAndFillRewriteSqlMap(querySql, ctx);
        PlanUtils.OutermostPlanFinderContext outermostPlanFinderContext = new PlanUtils.OutermostPlanFinderContext();
        analyzedPlan.accept(PlanUtils.OutermostPlanFinder.INSTANCE, outermostPlanFinderContext);
        List<Slot> outputs = outermostPlanFinderContext.outermostPlan.getOutput();
        createFinalCols(outputs);
    }

    /**translateToLegacyStmt*/
    public AlterViewStmt translateToLegacyStmt(ConnectContext ctx) {
        if (querySql == null) {
            return new AlterViewStmt(viewName.transferToTableName(), comment);
        }
        // expand star(*) in project list and replace table name with qualifier
        String rewrittenSql = rewriteSql(ctx.getStatementContext().getIndexInSqlToString(), querySql);
        // rewrite project alias
        rewrittenSql = rewriteProjectsToUserDefineAlias(rewrittenSql);
        checkViewSql(rewrittenSql);
        List<ColWithComment> cols = Lists.newArrayList();
        for (SimpleColumnDefinition def : simpleColumnDefinitions) {
            cols.add(def.translateToColWithComment());
        }
        AlterViewStmt alterViewStmt = new AlterViewStmt(viewName.transferToTableName(), cols, null, comment);
        alterViewStmt.setInlineViewDef(rewrittenSql);
        alterViewStmt.setFinalColumns(finalCols);
        return alterViewStmt;
    }

    public String getComment() {
        return comment;
    }
}