LiBinfeng-01 commented on code in PR #48587: URL: https://github.com/apache/doris/pull/48587#discussion_r1978503159
########## fe/fe-core/src/main/java/org/apache/doris/nereids/trees/plans/commands/ShowColumnHistogramStatsCommand.java: ########## @@ -0,0 +1,189 @@ +// 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.catalog.Column; +import org.apache.doris.catalog.DatabaseIf; +import org.apache.doris.catalog.Env; +import org.apache.doris.catalog.ScalarType; +import org.apache.doris.catalog.TableIf; +import org.apache.doris.catalog.Type; +import org.apache.doris.common.ErrorCode; +import org.apache.doris.common.ErrorReport; +import org.apache.doris.common.Pair; +import org.apache.doris.common.UserException; +import org.apache.doris.common.util.Util; +import org.apache.doris.datasource.CatalogIf; +import org.apache.doris.mysql.privilege.PrivPredicate; +import org.apache.doris.nereids.trees.plans.PlanType; +import org.apache.doris.nereids.trees.plans.commands.info.TableNameInfo; +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 org.apache.doris.statistics.Histogram; + +import com.google.common.collect.ImmutableList; +import com.google.common.collect.Lists; +import com.google.common.collect.Sets; + +import java.util.List; +import java.util.Objects; +import java.util.Optional; +import java.util.Set; +import java.util.stream.Collectors; + +/** + * Represents the command for SHOW COLUMN HISTOGRAM + */ +public class ShowColumnHistogramStatsCommand extends ShowCommand { + /** + * TITLE_NAMES + */ + private static final ImmutableList<String> TITLE_NAMES = + new ImmutableList.Builder<String>() + .add("column_name") + .add("data_type") + .add("sample_rate") + .add("num_buckets") + .add("buckets") + .build(); + + private TableNameInfo tableNameInfo; + + private final List<String> columnNames; + + private TableIf table; + + public ShowColumnHistogramStatsCommand(TableNameInfo tableNameInfo, List<String> columnNames) { + super(PlanType.SHOW_COLUMN_HISTOGRAM); + this.tableNameInfo = tableNameInfo; + this.columnNames = columnNames; + } + + /** + * validate + */ + public void validate(ConnectContext ctx) throws UserException { + tableNameInfo.analyze(ctx); + + // disallow external catalog + Util.prohibitExternalCatalog(tableNameInfo.getCtl(), this.getClass().getSimpleName()); + CatalogIf<DatabaseIf> catalog = Env.getCurrentEnv().getCatalogMgr().getCatalog(tableNameInfo.getCtl()); + if (catalog == null) { + ErrorReport.reportAnalysisException("Catalog: {} not exists", tableNameInfo.getCtl()); + } + DatabaseIf<TableIf> db = catalog.getDb(tableNameInfo.getDb()).orElse(null); + if (db == null) { + ErrorReport.reportAnalysisException("DB: {} not exists", tableNameInfo.getDb()); + } + table = db.getTable(tableNameInfo.getTbl()).orElse(null); + if (table == null) { + ErrorReport.reportAnalysisException("Table: {} not exists", tableNameInfo.getTbl()); + } + + if (!Env.getCurrentEnv().getAccessManager() + .checkTblPriv(ConnectContext.get(), tableNameInfo.getCtl(), tableNameInfo.getDb(), + tableNameInfo.getTbl(), PrivPredicate.SHOW)) { + ErrorReport.reportAnalysisException(ErrorCode.ERR_TABLEACCESS_DENIED_ERROR, "Permission denied", + ConnectContext.get().getQualifiedUser(), ConnectContext.get().getRemoteIP(), + tableNameInfo.getDb() + ": " + tableNameInfo.getTbl()); + } + + if (columnNames != null) { + Optional<Column> nullColumn = columnNames.stream() + .map(table::getColumn) + .filter(Objects::isNull) + .findFirst(); + if (nullColumn.isPresent()) { + ErrorReport.reportAnalysisException("Column: {} not exists", nullColumn.get()); + } + } + } + + /** + * getMetaData + */ + public ShowResultSetMetaData getMetaData() { + ShowResultSetMetaData.Builder builder = ShowResultSetMetaData.builder(); + + for (String title : TITLE_NAMES) { + builder.addColumn(new Column(title, ScalarType.createVarchar(30))); + } + return builder.build(); + } + + public TableIf getTable() { + return table; + } + + /** + * constructResultSet + */ + public ShowResultSet constructResultSet(List<Pair<String, Histogram>> columnStatistics) { + List<List<String>> result = Lists.newArrayList(); + columnStatistics.forEach(p -> { + if (p.second == null || p.second.dataType == Type.NULL) { + return; + } + List<String> row = Lists.newArrayList(); + row.add(p.first); + row.add(String.valueOf(p.second.dataType)); + row.add(String.valueOf(p.second.sampleRate)); + row.add(String.valueOf(p.second.numBuckets)); + row.add(Histogram.getBucketsJson(p.second.buckets).toString()); + result.add(row); + }); + + return new ShowResultSet(getMetaData(), result); + } + + /** + * getColumnNames + */ + public Set<String> getColumnNames() { + if (columnNames != null) { + return Sets.newHashSet(columnNames); + } + return table.getColumns().stream() + .map(Column::getName).collect(Collectors.toSet()); + } + + @Override + public ShowResultSet doRun(ConnectContext ctx, StmtExecutor executor) throws Exception { + validate(ctx); + List<Pair<String, Histogram>> columnStatistics = Lists.newArrayList(); + + // TODO: support histogram in the future. Review Comment: pls remove todo quoted code block if we do not want to support it immediately -- 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
