In Coordinator, a shuffle map consists of `recvrId` in each instance.
For example, if 3 BEs exist in a cluster, for a shuffled hash join, we
get 3 maps for a fragment sent to each BE:
BE0: {0:0, 1:1}
BE1: {2:0, 3:1}
BE2: {4:0, 5:1}
In this example, parallelism is 2. Keys in shuffle map indicate the
global shuffle id and the values indicate the instance id in current BE.
In Coordinator, the `recvrId` is the global shuffle id of each instance
so we may get a wrong result if it is wrong.
This bug is caused by `recvrId` set by a BHJ fragment. If a fragment
contains both BHJ and SHJ, `recvrId` should be set by SHJ and BHJ should
be ignored.
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