public void addScope(ScopeChild scopeChild) {
        children.add(scopeChild);
        aliasMap.put(scopeChild.getAlias(), scopeChild);
    }
Reason:
Date: 2018/7/20
Company: www.dtstack.com

@author xuchao
core/src/main/java/com/dtstack/flink/sql/side/JoinScope.java