Github user wzhfy commented on a diff in the pull request:
    --- Diff: 
    @@ -202,14 +201,15 @@ object JoinReorderDP extends PredicateHelper {
    -   * Builds a new JoinPlan if the two given sides can be joined with some 
    +   * Builds a new JoinPlan if there exists at least one join condition 
involving references from
    +   * both left and right.
        * @param oneJoinPlan One side JoinPlan for building a new JoinPlan.
        * @param otherJoinPlan The other side JoinPlan for building a new join 
    --- End diff --
    left and right sides are decided inside this method. It tends to build a 
left deep tree.

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