ShowWorkloadGroupsStmt.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.Column;
import org.apache.doris.catalog.ScalarType;
import org.apache.doris.common.AnalysisException;
import org.apache.doris.common.UserException;
import org.apache.doris.qe.ConnectContext;
import org.apache.doris.qe.ShowResultSetMetaData;
import org.apache.doris.resource.workloadgroup.WorkloadGroupMgr;

public class ShowWorkloadGroupsStmt extends ShowStmt implements NotFallbackInParser {

    private String pattern;
    // TODO: not supported yet
    private Expr whereClause;

    public ShowWorkloadGroupsStmt(String pattern, Expr where) {
        this.pattern = pattern;
        this.whereClause = where;
    }

    public String getPattern() {
        return pattern;
    }

    @Override
    public void analyze(Analyzer analyzer) throws UserException {
        super.analyze(analyzer);
        if (this.whereClause != null) {
            throw new AnalysisException("Where clause is not supported in show workload groups statement");
        }
    }

    @Override
    public String toSql() {
        String sql = "SHOW WORKLOAD GROUPS";
        if (this.pattern != null) {
            sql += " LIKE '" + pattern + "'";
        }
        return sql;
    }

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

    @Override
    public ShowResultSetMetaData getMetaData() {
        ShowResultSetMetaData.Builder builder = ShowResultSetMetaData.builder();
        for (String title : WorkloadGroupMgr.WORKLOAD_GROUP_PROC_NODE_TITLE_NAMES) {
            builder.addColumn(new Column(title, ScalarType.createVarchar(30)));
        }
        return builder.build();
    }

    @Override
    public RedirectStatus getRedirectStatus() {
        if (ConnectContext.get().getSessionVariable().getForwardToMaster()) {
            return RedirectStatus.FORWARD_NO_SYNC;
        } else {
            return RedirectStatus.NO_FORWARD;
        }
    }
}