flink No operators defined in streaming topology. Cannot execute. 问题

[HunterXHunter <13...@qq.com>]

EnvironmentSettings sett =
               
EnvironmentSettings.newInstance().useBlinkPlanner().inStreamingMode().build();
StreamTableEnvironment streamTableEnv =
StreamTableEnvironment.create(streamEnv, sett);


//当程序全部使用ddl方式执行的时候
streamTableEnv.executeSql(DDLSourceSQLManager.createTableUseDDLFromKafka();
streamTableEnv.executeSql(com.ddlsql.DDLSourceSQLManager.createPrintlnRetractSinkTbl("printTable"));
streamTableEnv.executeSql("insert into printTable select msg,count(*) as cnt
from test group by msg");
 // 以下两个都报错
streamExecutionEnvironment.execute("");
streamTableEnv.execute("");

// ----------------------------------------------
//但是当我创建test表的方式改为就可以运行
Table a = tableEnv.fromDataStream(source, "topic,offset,ts,date,msg")
tableEnv.createTemporaryView("test", a);
streamTableEnv.executeSql(com.ddlsql.DDLSourceSQLManager.createPrintlnRetractSinkTbl("printTable"));
streamTableEnv.executeSql("insert into printTable select msg,count(*) as cnt
from test group by msg");
streamExecutionEnvironment.execute("");


// 但是当我 以下两个同时存在也可以正常运行。
Table a = tableEnv.fromDataStream(source, "topic,offset,ts,date,msg")
streamTableEnvironment.createTemporaryView("tablename随便取", a);
streamTableEnvironment.executeSql(DDLSourceSQLManager.createStreamFromKafka();


问题：
1：在DDL的程序中，必须要有DataStream才能执行？
2：streamTableEnv.executeSql() 能立马执行，不需要 streamTableEnv.execute(""),是在
batch场景？我在流场景都是需要 execute



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