DropStatsStmt.java

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// to you under the Apache License, Version 2.0 (the
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//   http://www.apache.org/licenses/LICENSE-2.0
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package org.apache.doris.analysis;

import org.apache.doris.catalog.DatabaseIf;
import org.apache.doris.catalog.Env;
import org.apache.doris.catalog.TableIf;
import org.apache.doris.common.AnalysisException;
import org.apache.doris.common.ErrorCode;
import org.apache.doris.common.ErrorReport;
import org.apache.doris.common.UserException;
import org.apache.doris.datasource.CatalogIf;
import org.apache.doris.mysql.privilege.PrivPredicate;
import org.apache.doris.qe.ConnectContext;

import org.apache.commons.lang3.StringUtils;

import java.util.HashSet;
import java.util.List;
import java.util.Set;

/**
 * Manually drop statistics for tables or partitions.
 * Table or partition can be specified, if neither is specified,
 * all statistics under the current database will be deleted.
 * <p>
 * syntax:
 * DROP [EXPIRED] STATS [TableName [PARTITIONS(partitionNames)]];
 */
public class DropStatsStmt extends DdlStmt implements NotFallbackInParser {

    public static final int MAX_IN_ELEMENT_TO_DELETE = 100;
    public final boolean dropExpired;

    private final TableName tableName;
    private Set<String> columnNames;
    private PartitionNames partitionNames;
    private boolean isAllColumns;

    private long catalogId;
    private long dbId;
    private long tblId;

    public DropStatsStmt(boolean dropExpired) {
        this.dropExpired = dropExpired;
        this.tableName = null;
        this.columnNames = null;
        this.partitionNames = null;
    }

    public DropStatsStmt(TableName tableName,
            List<String> columnNames, PartitionNames partitionNames) {
        this.tableName = tableName;
        this.partitionNames = partitionNames;
        if (columnNames != null) {
            this.columnNames = new HashSet<>(columnNames);
        }
        dropExpired = false;
    }

    @Override
    public void analyze(Analyzer analyzer) throws UserException {
        if (!ConnectContext.get().getSessionVariable().enableStats) {
            throw new UserException("Analyze function is forbidden, you should add `enable_stats=true`"
                    + "in your FE conf file");
        }
        super.analyze(analyzer);
        if (dropExpired) {
            return;
        }
        if (tableName == null) {
            throw new UserException("Should specify a valid table name.");
        }
        tableName.analyze(analyzer);
        String catalogName = tableName.getCtl();
        String dbName = tableName.getDb();
        String tblName = tableName.getTbl();
        CatalogIf catalog = analyzer.getEnv().getCatalogMgr()
                .getCatalogOrAnalysisException(catalogName);
        DatabaseIf db = catalog.getDbOrAnalysisException(dbName);
        TableIf table = db.getTableOrAnalysisException(tblName);
        tblId = table.getId();
        dbId = db.getId();
        catalogId = catalog.getId();
        // check permission
        checkAnalyzePriv(catalogName, db.getFullName(), table.getName());
        // check columnNames
        if (columnNames != null) {
            if (columnNames.size() > MAX_IN_ELEMENT_TO_DELETE) {
                throw new UserException("Can't delete more that " + MAX_IN_ELEMENT_TO_DELETE + " columns at one time.");
            }
            isAllColumns = false;
            for (String cName : columnNames) {
                if (table.getColumn(cName) == null) {
                    ErrorReport.reportAnalysisException(
                            ErrorCode.ERR_WRONG_COLUMN_NAME,
                            "DROP",
                            ConnectContext.get().getQualifiedUser(),
                            ConnectContext.get().getRemoteIP(),
                            cName);
                }
            }
        } else {
            isAllColumns = true;
        }
        if (partitionNames != null && partitionNames.getPartitionNames() != null
                && partitionNames.getPartitionNames().size() > MAX_IN_ELEMENT_TO_DELETE) {
            throw new UserException("Can't delete more that " + MAX_IN_ELEMENT_TO_DELETE + " partitions at one time");
        }
    }

    public long getTblId() {
        return tblId;
    }

    public long getDbId() {
        return dbId;
    }

    public long getCatalogIdId() {
        return catalogId;
    }

    public Set<String> getColumnNames() {
        return columnNames;
    }

    public boolean isAllColumns() {
        return isAllColumns;
    }

    public PartitionNames getPartitionNames() {
        return partitionNames;
    }

    @Override
    public String toSql() {
        StringBuilder sb = new StringBuilder();
        sb.append("DROP STATS ");

        if (tableName != null) {
            sb.append(tableName.toSql());
        }

        if (columnNames != null) {
            sb.append("(");
            sb.append(StringUtils.join(columnNames, ","));
            sb.append(")");
        }

        if (partitionNames != null) {
            sb.append(" PARTITION(");
            if (partitionNames.isStar()) {
                sb.append("*");
            } else {
                sb.append(StringUtils.join(partitionNames.getPartitionNames(), ","));
            }
            sb.append(")");
        }

        return sb.toString();
    }

    @Override
    public String toString() {
        return toSql();
    }

    private void checkAnalyzePriv(String catalogName, String dbName, String tblName) throws AnalysisException {
        if (!Env.getCurrentEnv().getAccessManager()
                .checkTblPriv(ConnectContext.get(), catalogName, dbName, tblName,
                        PrivPredicate.DROP)) {
            ErrorReport.reportAnalysisException(
                    ErrorCode.ERR_TABLEACCESS_DENIED_ERROR,
                    "DROP",
                    ConnectContext.get().getQualifiedUser(),
                    ConnectContext.get().getRemoteIP(),
                    dbName + "." + tblName);
        }
    }

    @Override
    public StmtType stmtType() {
        return StmtType.DROP;
    }
}