Fixed dtype for grp_id
Fixed dtype for grp_id


Former-commit-id: a321abf7b162f5408205329fd8d76511c55fe2f2 [formerly a321abf7b162f5408205329fd8d76511c55fe2f2 [formerly 4b122b58d0d3e85c9455df659759176bbbe77268]]
Former-commit-id: 8c0d5a702e9000c3fe7bd5521f776797c9b23f20
Former-commit-id: 3878779a585f5a78e1407b53b2a528bf3922a5de
gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine