force time column uint32

[codecov[bot]]

Codecov Report

Merging #321 into master will increase coverage by 0.06%. The diff coverage is 100%.

@@            Coverage Diff            @@
##           master    #321      +/-   ##
=========================================
+ Coverage   72.03%   72.1%   +0.06%     
=========================================
  Files         167     167              
  Lines       23591   23598       +7     
=========================================
+ Hits        16994   17015      +21     
+ Misses       5292    5278      -14     
  Partials     1305    1305

Impacted Files	Coverage Δ
datanode/datanode.go	18.81% <ø> (ø)	:arrow_up:
api/debug_handler.go	74.79% <ø> (ø)	:arrow_up:
api/query_handler.go	73.68% <100%> (ø)	:arrow_up:
memstore/list/archive_vector_party.go	66.82% <100%> (ø)	:arrow_up:
api/data_handler.go	70% <100%> (ø)	:arrow_up:
query/aql_processor.go	80.83% <100%> (ø)	:arrow_up:
subscriber/common/message/message_parser.go	62.5% <100%> (+8.56%)	:arrow_up:
controller/mutators/etcd/schema_mutator.go	61.84% <0%> (-1.74%)	:arrow_down:
memstore/cuckoo_index.go	91.27% <0%> (+1%)	:arrow_up:
subscriber/common/job/streaming_processor.go	63.69% <0%> (+2.22%)	:arrow_up:
... and 2 more

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[lxning]

since we are doing this change. I think it might be better to provide more supported underlying transformation for time column. Like from string (ISO timestamp format) to uint32 seconds will be quite useful to users

Transformation needs define the mapping b/w from item in message and to column in table schema. This definition has not been supported in RTA yet.

[lxning]

merge with backfill support