LiBinfeng-01 commented on code in PR #43103: URL: https://github.com/apache/doris/pull/43103#discussion_r1827160577
########## fe/fe-core/src/main/java/org/apache/doris/nereids/trees/plans/commands/UnsetVariableCommand.java: ########## @@ -0,0 +1,160 @@ +// Licensed to the Apache Software Foundation (ASF) under one +// or more contributor license agreements. See the NOTICE file +// 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 +// +// Unless required by applicable law or agreed to in writing, +// software distributed under the License is distributed on an +// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY +// KIND, either express or implied. See the License for the +// specific language governing permissions and limitations +// under the License. + +package org.apache.doris.nereids.trees.plans.commands; + +import org.apache.doris.analysis.RedirectStatus; +import org.apache.doris.analysis.SetType; +import org.apache.doris.analysis.SetVar; +import org.apache.doris.analysis.StringLiteral; +import org.apache.doris.catalog.Env; +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.UserException; +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.StmtExecutor; +import org.apache.doris.qe.VariableMgr; + +import org.apache.commons.lang3.StringUtils; +import org.apache.logging.log4j.LogManager; +import org.apache.logging.log4j.Logger; + +/** + * UnSetVarOp + */ +public class UnsetVariableCommand extends Command implements Forward { + private static final Logger LOG = LogManager.getLogger(StmtExecutor.class); + + private SetType setType; + + // variables to restore + private String variable = null; + + private boolean applyToAll = false; + + public UnsetVariableCommand(SetType setType, String varName) { + super(PlanType.UNSET_VARIABLE_COMMAND); + this.setType = setType; + this.variable = varName; + } + + public UnsetVariableCommand(SetType setType, boolean applyToAll) { + super(PlanType.UNSET_VARIABLE_COMMAND); + this.setType = setType; + this.applyToAll = applyToAll; + } + + public SetType getSetType() { + return setType; + } + + public String getVariable() { + return variable; + } + + public boolean isApplyToAll() { + return applyToAll; + } + + private void validate() throws UserException { + if (StringUtils.isEmpty(variable) && !applyToAll) { + throw new AnalysisException("You should specific the unset variable."); + } + + if (setType == SetType.GLOBAL) { + if (!Env.getCurrentEnv().getAccessManager().checkGlobalPriv(ConnectContext.get(), PrivPredicate.ADMIN)) { + ErrorReport.reportAnalysisException(ErrorCode.ERR_SPECIFIC_ACCESS_DENIED_ERROR, + "ADMIN"); + } + } + } + + /** + * return sql expression of this command + * @return string of this command + */ + public String toSql() { + StringBuilder sb = new StringBuilder(); + + sb.append("UNSET "); + sb.append(setType).append(" VARIABLE "); + if (!StringUtils.isEmpty(variable)) { + sb.append(variable).append(" "); + } else if (applyToAll) { + sb.append("ALL"); + } + return sb.toString(); + } + + @Override + public RedirectStatus toRedirectStatus() { + if (setType == SetType.GLOBAL) { + return RedirectStatus.FORWARD_WITH_SYNC; + } + + return RedirectStatus.NO_FORWARD; + } + + @Override + public void afterForwardToMaster(ConnectContext context) throws Exception { + if (isApplyToAll()) { + VariableMgr.setAllVarsToDefaultValue(context.getSessionVariable(), SetType.SESSION); Review Comment: because when follower unset variable in global mode, it would trigger forward_with_sync mode decided by toRedirectStatus and calling forwardToMaster. When forwardToMaster, master would write it to editLog which means it would persist to Env 'storage'. And when follower restart, it replayJournal from last updated one, which is sync with master. So here the only thing it need to do is set current variable in session mode. -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: commits-unsubscr...@doris.apache.org For queries about this service, please contact Infrastructure at: us...@infra.apache.org --------------------------------------------------------------------- To unsubscribe, e-mail: commits-unsubscr...@doris.apache.org For additional commands, e-mail: commits-h...@doris.apache.org
