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#' @include DataBackend.R
DataBackendCbind = R6Class("DataBackendCbind", inherit = DataBackend, cloneable = FALSE,
public = list(
initialize = function(b1, b2) {
assert_backend(b1)
assert_backend(b2)
pk = b1$primary_key
data_formats = intersect(b1$data_formats, b2$data_formats)
if ("data.table" %nin% data_formats) {
stopf("There is supported data format for the backends to cbind (supported: 'data.table')")
}
if (pk != b2$primary_key) {
stopf("All backends to cbind must have the primary_key '%s'", pk)
}
super$initialize(list(b1 = b1, b2 = b2), pk, "data.table")
},
data = function(rows, cols, data_format = "data.table") {
pk = self$primary_key
qrows = unique(assert_numeric(rows))
qcols = union(assert_names(cols, type = "unique"), pk)
assert_choice(data_format, self$data_formats)
data = private$.data$b2$data(qrows, qcols, data_format = data_format)
if (ncol(data) < length(qcols)) {
qcols = c(setdiff(cols, names(data)), pk)
tmp = private$.data$b1$data(qrows, qcols, data_format = data_format)
data = merge(data, tmp, by = pk, all = TRUE, sort = TRUE)
}
# duplicate rows / reorder columns
ijoin(data, rows, intersect(cols, names(data)), pk)
},
head = function(n = 6L) {
rows = head(self$rownames, n)
self$data(rows = rows, cols = self$colnames)
},
distinct = function(rows, cols, na_rm = TRUE) {
d2 = private$.data$b2$distinct(rows, cols, na_rm = na_rm)
d1 = private$.data$b1$distinct(rows, setdiff(cols, names(d2)), na_rm = na_rm)
res = c(d1, d2)
res[reorder_vector(names(res), cols)]
},
missings = function(rows, cols) {
m2 = private$.data$b2$missings(rows, cols)
m1 = private$.data$b1$missings(rows, setdiff(cols, names(m2)))
if (length(m2) == 0L && length(m1) == 0L) {
return(set_names(integer()))
}
res = c(m1, m2)
res[reorder_vector(names(res), cols)]
}
),
active = list(
rownames = function() {
union(private$.data$b1$rownames, private$.data$b2$rownames)
},
colnames = function() {
union(private$.data$b1$colnames, private$.data$b2$colnames)
},
nrow = function() {
uniqueN(c(private$.data$b1$rownames, private$.data$b2$rownames))
},
ncol = function() {
uniqueN(c(private$.data$b1$colnames, private$.data$b2$colnames))
},
col_hashes = function() {
insert_named(private$.data$b1$col_hashes, private$.data$b2$col_hashes)
}
),
private = list(
.calculate_hash = function() {
data = private$.data
calculate_hash(data$b1$hash, data$b2$hash)
}
)
)
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