| /* |
| * 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.tajo.plan.rewrite; |
| |
| import org.apache.commons.logging.Log; |
| import org.apache.commons.logging.LogFactory; |
| import org.apache.tajo.OverridableConf; |
| import org.apache.tajo.SessionVars; |
| import org.apache.tajo.catalog.TableDesc; |
| import org.apache.tajo.catalog.statistics.TableStats; |
| import org.apache.tajo.exception.TajoException; |
| import org.apache.tajo.exception.UnsupportedException; |
| import org.apache.tajo.plan.LogicalPlan; |
| import org.apache.tajo.plan.StorageService; |
| import org.apache.tajo.plan.expr.EvalNode; |
| import org.apache.tajo.plan.logical.LogicalNode; |
| import org.apache.tajo.plan.logical.ScanNode; |
| import org.apache.tajo.plan.visitor.BasicLogicalPlanVisitor; |
| |
| import java.util.Optional; |
| import java.util.Stack; |
| |
| public class TableStatUpdateRewriter implements LogicalPlanRewriteRule { |
| private static final Log LOG = LogFactory.getLog(TableStatUpdateRewriter.class); |
| |
| private static final String NAME = "Table Stat Updater"; |
| |
| @Override |
| public String getName() { |
| return NAME; |
| } |
| |
| @Override |
| public boolean isEligible(LogicalPlanRewriteRuleContext context) { |
| return true; |
| } |
| |
| @Override |
| public LogicalPlan rewrite(LogicalPlanRewriteRuleContext context) throws TajoException { |
| LogicalPlan plan = context.getPlan(); |
| LogicalPlan.QueryBlock rootBlock = plan.getRootBlock(); |
| |
| Rewriter r = new Rewriter(context.getQueryContext(), context.getStorage()); |
| r.visit(rootBlock, plan, rootBlock, rootBlock.getRoot(), new Stack<>()); |
| return plan; |
| } |
| |
| private final class Rewriter extends BasicLogicalPlanVisitor<Object, Object> { |
| private final OverridableConf conf; |
| private final StorageService storage; |
| |
| |
| private Rewriter(OverridableConf conf, StorageService storage) { |
| this.conf = conf; |
| this.storage = storage; |
| } |
| |
| @Override |
| public Object visitScan(Object object, LogicalPlan plan, LogicalPlan.QueryBlock block, ScanNode scanNode, |
| Stack<LogicalNode> stack) throws TajoException { |
| final TableDesc table = scanNode.getTableDesc(); |
| |
| if (!isVirtual(table)) { |
| final TableStats stats = getTableStat(table); |
| final long tableSize = stats.getNumBytes(); |
| final Optional<EvalNode> filter = scanNode.hasQual() ? Optional.of(scanNode.getQual()) : Optional.empty(); |
| |
| // If USE_TABLE_VOLUME is set, we will update the table volume through a storage handler. |
| // In addition, if the table size is zero, we will update too. |
| // It is a good workaround to avoid suboptimal join orders without cheap cost. |
| if (conf.getBool(SessionVars.USE_TABLE_VOLUME) || tableSize == 0) { |
| table.getStats().setNumBytes(getTableVolume(table, filter)); |
| } |
| } |
| |
| return scanNode; |
| } |
| |
| private TableStats getTableStat(TableDesc table) { |
| TableStats stats; |
| if (table.getStats() == null) { |
| stats = new TableStats(); |
| table.setStats(stats); |
| } else { |
| stats = table.getStats(); |
| } |
| return stats; |
| } |
| |
| private boolean isVirtual(TableDesc table) { |
| return table.getMeta().getDataFormat().equals("SYSTEM"); |
| } |
| |
| private long getTableVolume(TableDesc table, Optional<EvalNode> filter) { |
| try { |
| if (table.getStats() != null) { |
| return storage.getTableVolumn(table.getUri(), filter); |
| } |
| } catch (UnsupportedException t) { |
| LOG.warn(table.getName() + " does not support Tablespace::getTableVolume()"); |
| } |
| |
| // By default, return -1; |
| return -1; |
| } |
| } |
| } |