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Previously multi threads in GCWorker use one Session, which may cause we can't get a good transaction when we execute SQLs. Now we make them use tmp sessions to resolve that.
use tmp session in gc_worker.
Merge branch 'master' into qupeng/del-range-fix
@shenli @tiancaiamao @hanfei1991 , PTAL, thanks.
use tmp session in gc_worker. (#4453)