Nothing
test_project_narrowing <- function() {
db <- rquery_db_info(identifier_quote_char = "`", string_quote_char = '"')
d <- data.frame(group = c('a', 'a', 'b', 'b'),
val = 1:4,
stringsAsFactors = FALSE)
op_tree <- local_td(d) %.>%
project_se(., groupby = "group", "vmax" %:=% "max(val)")
txt <- format(op_tree)
txt <- to_sql(op_tree, db)
expect_equal(sort(column_names(op_tree)), c("group", "vmax"))
op_tree <- local_td(d) %.>%
project_se(., groupby = "group", "vmax" %:=% "max(val)") %.>%
select_columns(., "group")
txt <- format(op_tree)
txt <- to_sql(op_tree, db)
expect_equal(sort(column_names(op_tree)), c("group"))
op_tree <- local_td(d) %.>%
project_se(., groupby = "group", "vmax" %:=% "max(val)") %.>%
select_columns(., "vmax")
txt <- format(op_tree)
txt <- to_sql(op_tree, db)
expect_equal(sort(column_names(op_tree)), c("vmax"))
invisible(NULL)
}
test_project_narrowing()
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