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package com.easy.query.gauss.db.func;

import com.easy.query.core.expression.parser.core.available.TableAvailable;
import com.easy.query.core.func.column.ColumnExpression;
import com.easy.query.core.func.def.AbstractExpressionSQLFunction;
import com.easy.query.core.util.EasyCollectionUtil;

import java.util.List;

/**
 * create time 2023/10/13 18:17
 * 文件说明
 *
 * @author xuejiaming
 */
public class GaussDBNullDefaultSQLFunction extends AbstractExpressionSQLFunction {
    private final List columnExpressions;

    public GaussDBNullDefaultSQLFunction(List columnExpressions) {

        this.columnExpressions = columnExpressions;
    }

    @Override
    public String sqlSegment(TableAvailable defaultTable) {
        Iterable params = EasyCollectionUtil.select(columnExpressions, (t, i) -> "{" + i + "}");
        return String.format("COALESCE(%s)", String.join(",", params));
    }

    @Override
    public int paramMarks() {
        return columnExpressions.size();
    }

    @Override
    protected List getColumnExpressions() {
        return columnExpressions;
    }
}