Converting a join to a an arrow (R
version, Python
version).
library(wrapr) library(rquery) library(rqdatatable)
d1 <- wrapr::build_frame( "key" , "x" | "a" , 1 | "b" , 2 ) knitr::kable(d1)
table_1_description <- local_td(d1, name='d1') table_1_description
d2 <- wrapr::build_frame( "key" , "y" | "b" , 3 | "c" , 4 ) knitr::kable(d2)
table_2_description <- local_td(d2, name='d2') table_2_description
ops <- table_1_description %.>% natural_join(., b=table_2_description, by='key', jointype='FULL')
arrow_1 = arrow(ops, free_table_key = table_1_description$table_name) print(arrow_1)
arrow_2 = arrow(ops, free_table_key = table_2_description$table_name) print(arrow_2)
res <- ex_data_table( arrow_1$pipeline, tables = list( d1 = d1, d2 = d2)) knitr::kable(res)
More on the categorical arrow treatment of data transformations can be found here.
(Examples of advanced inter-operation between the R
rquery
package and the Python
data_algebra
package and SQL
can be found here.)
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