Edit SelectNode/RelationNode
Merge branch 'Thang' of https://github.com/jthomas304/SimpleSQL into Thang

# By jthomas304
# Via jthomas304
* 'Thang' of https://github.com/jthomas304/SimpleSQL:
  Update MergeJoin.java
  Update IndexedNestedLoopJoin.java
  Update HashJoin.java
  Update BNLJoin.java
  Update BNLJoin.java
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