Nothing
test_select_narrowing <- function() {
db <- rquery_db_info(identifier_quote_char = "`", string_quote_char = '"')
x <- data.frame(a = 1:3, b = 4:6, c = 7:9)
op1 <- local_td(x) %.>% extend(., e %:=% a + 1)
# cat(to_sql(op1, db))
expect_equal(sort(column_names(op1)), c("a", "b", "c", "e"))
op2 <- op1 %.>% select_columns(., "e")
# cat(to_sql(op2, db))
expect_equal(sort(column_names(op2)), c("e"))
op3 <- op1 %.>% select_columns(., "b")
# cat(to_sql(op3, db))
expect_equal(sort(column_names(op3)), c("b"))
op4 <- local_td(x) %.>% extend(., a %:=% a + 1)
# cat(to_sql(op4, db))
expect_equal(sort(column_names(op4)), c("a", "b", "c"))
op5 <- op4 %.>% select_columns(., "a")
# cat(to_sql(op5, db))
expect_equal(sort(column_names(op5)), c("a"))
op6 <- op4 %.>% select_columns(., "b")
# cat(to_sql(op6, db))
expect_equal(sort(column_names(op6)), c("b"))
op7 <- op4 %.>% select_columns(., c("a", "b"))
# cat(to_sql(op7, db))
expect_equal(sort(column_names(op7)), c("a", "b"))
invisible(NULL)
}
test_select_narrowing()
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