fix:修复了set_schema当中会因为多次调用open而添加重复数据的问题 #313
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What problem were solved in this pull request?
Issue Number: close #311
Problem:NLJ里面会遍历多次右表，就会调用很多次open，在open当中就会调用set_schema，然后join的时候就会添加大量重复的field和value的tuple，后续的话会被select的字段给过滤掉，不影响正确性，但是进行了冗余存储
What is changed and how it works?
在set_schema当中，每次先将原本的数据clear掉
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