Allow creation of empty DataFrame based on schema only #901
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eitsupi
reviewed
Mar 8, 2024
| return(.pr$DataFrame$default()) | ||
| if (!is.null(schema)) { | ||
| largs <- lapply(seq_along(schema), \(x) { | ||
| pl$lit(numeric(0))$cast(schema[[x]])$alias(names(schema)[x]) |
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I think we can use NULL instead of numeric(0).
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| test_that("construct an empty DataFrame with schema only", { | ||
| s <- as_polars_df(iris[, c(1, 2, 5)])$schema | ||
| expect_identical( | ||
| pl$DataFrame(schema = s)$to_list(), | ||
| list(Sepal.Length = numeric(0), Sepal.Width = numeric(0), Species = factor()) | ||
| ) | ||
| }) |
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More tests (more types) should be tested.
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Close #900