SetCharsetAndCollateVarOp.java

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// 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
//
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package org.apache.doris.nereids.trees.plans.commands.info;

import org.apache.doris.analysis.SetType;
import org.apache.doris.common.ErrorCode;
import org.apache.doris.common.ErrorReport;
import org.apache.doris.common.UserException;
import org.apache.doris.qe.ConnectContext;

import com.google.common.base.Strings;

/**
 * SetCharsetAndCollateVarOp
 */
public class SetCharsetAndCollateVarOp extends SetVarOp {
    private static final String DEFAULT_NAMES = "utf8";
    private String charset;
    private String collate;

    public SetCharsetAndCollateVarOp(String charsetName) {
        this(charsetName, null);
    }

    public SetCharsetAndCollateVarOp(String charsetName, String collate) {
        super(SetType.DEFAULT);
        this.charset = charsetName;
        this.collate = collate;
    }

    @Override
    public void run(ConnectContext ctx) throws Exception {
        // do nothing
    }

    @Override
    public void validate(ConnectContext ctx) throws UserException {
        if (Strings.isNullOrEmpty(charset)) {
            charset = DEFAULT_NAMES;
        } else {
            charset = charset.toLowerCase();
        }
        // utf8-superset transform to utf8
        if (charset.startsWith(DEFAULT_NAMES)) {
            charset = DEFAULT_NAMES;
        }

        if (!charset.equalsIgnoreCase(DEFAULT_NAMES)) {
            ErrorReport.reportAnalysisException(ErrorCode.ERR_UNKNOWN_CHARACTER_SET, charset);
        }
    }

    @Override
    public String toSql() {
        return "NAMES '" + charset + "' COLLATE "
                + (Strings.isNullOrEmpty(collate) ? "DEFAULT" : "'" + collate.toLowerCase() + "'");
    }
}