Mondrain支持kylin问题解决
Mdx
select
{[MEASURES].[UNITPRICE],[MEASURES].[NUMBER]} on columns,
{[CUSTOMER].[GENDER].members} on rows
from saleinfo
问题
问题1： mondrian转换过来的sql kylin不支持：Cartesian Join is not supported. while executing SQL: "select "CUSTOMER"."GENDER" as "c0", sum("SALE"."UNITPRICE") as "m0", sum("SALE"."NUMBER") as "m1" from "SALE" as "SALE", "CUSTOMER" as "CUSTOMER" where "SALE"."CUSID" = "CUSTOMER"."CUSID" group by "CUSTOMER"."GENDER"
不支持笛卡儿积的写法=》对应源码修改1，2，3
问题2：No realization found for OLAPContext, MODEL_UNMATCHED_JOIN, rel#993:OLAPTableScan.OLAP.[](table=[PUBLIC, SALE],ctx=,fields=[0, 1, 2, 3, 4, 5, 6, 7]), JoinDesc [type=INNER, primary_key=[CUSID], foreign_key=[CUSID]] while executing SQL: "select "CUSTOMER"."GENDER" as "c0", sum("SALE"."UNITPRICE") as "m0", sum("SALE"."NUMBER") as "m1" from "SALE" as "SALE" join "CUSTOMER" as "CUSTOMER" on "SALE"."CUSID" = "CUSTOMER"."CUSID" group by "CUSTOMER"."GENDER
源码修改1，2，3执行完之后，转换出的sql 中join 没有带left，kylin不支持。对应解决方法是修改4。
源码修改
1.Dialect.java的枚举类型DatabaseProduct中新增KYLIN.
2.JdbcDialectImpl.java的getProduct中新增对kyin的支持：else if (upperProductName.equals("KYLIN")){
return DatabaseProduct.KYLIN;
}
3.新增KylinDialect.java类
/**
* @author wangzhou
* @date 2018年7月10日
* 增加kylin支持
*/
package mondrian.spi.impl;
import java.sql.*;
import mondrian.spi.*;
public class KylinDialect extends JdbcDialectImpl {
public static final JdbcDialectFactory FACTORY;
public KylinDialect(final Connection connection) throws SQLException {
super(connection);
}
public boolean allowsCountDistinct() {
return false;
}
public boolean allowsJoinOn() {
return true;
}
static {
FACTORY = new JdbcDialectFactory(KylinDialect.class, Dialect.DatabaseProduct.KYLIN) {
protected boolean acceptsConnection(final Connection connection) {
return super.acceptsConnection(connection);
}
};
}
}
4.修改SqlQuery.java的toBuffer()中的三目运算String fromSep = joinCount > 0 ? " join " : ", ";修改为String fromSep = joinCount > 0 ? " left join " : ", ";
