r - Add a $hint to rmongodb query -

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does know how add hint argument mongo query when using rmongodb package? note: hint deprecated.

currently i'm using mongo.find.all query it's simplicity rather separate cursor, buffer commands.

mongo.find.all(mongo = mongo,                 ns = "ops.weather",                 query = "{\"where.zip_code\":\"60603\", \"what.currently.time\":{\"$gte\":1430936418}}",                sort = mongo.bson.empty(),                 fields = list(what.currently.time = 1l,                              what.currently.precipintensity = 1l,                              what.currently.temperature = 1l,                              what.currently.windspeed = 1l,                              what.currently.windbearing = 1l,                              where.zip_code = 1l,                              where.latitude = 1l,                              where.longitude = 1l,                              what.observation_type = 1l),                limit = 0l,                skip = 0l,                options = 0l,                data.frame = true)

in mongo query this, without fields in full example above:

db.weather.find({"where.zip_code" : "60603","what.currently.time" : {"$gte" : 1430936418}}).hint("where.zip_code_1_what.currently.time_1")

the hint improves query performance when used in mongo, useful implement in ongoing r process.

current sessioninfo()

> sessioninfo() r version 3.2.1 (2015-06-18) platform: i386-w64-mingw32/i386 (32-bit) running under: windows 7 (build 7601) service pack 1  locale: [1] lc_collate=english_united states.1252  lc_ctype=english_united states.1252    [3] lc_monetary=english_united states.1252 lc_numeric=c                           [5] lc_time=english_united states.1252      attached base packages: [1] stats     graphics  grdevices utils     datasets  methods   base       other attached packages: [1] rmongodb_1.8.0  loaded via namespace (and not attached): [1] plyr_1.8.3       tools_3.2.1      rstudioapi_0.3.1 rcpp_0.12.0      jsonlite_0.9.16

after doing bit of research, found can supply hint $hint argument query. in mongodb this:

db.weather.find( {$query: {...}, $hint: {"where": 1, ...}})

and can same in rmongodb. change query this:

query =    "{\"$query\":      {\"where.zip_code\":\"60603\", \"what.currently.time\":{\"$gte\":1430936418}},     \"$hint\":       \"where.zip_code_1_what.currently.time_1\"}"

i tested , worked on test dataset without errors. let me know if worked you.


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