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`glue_sql()` now collapses zero-length vector into `DBI::SQL("NULL")` #134

merged 1 commit into from Apr 15, 2019
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Just for now

@@ -3,6 +3,7 @@
## Features

* `glue()` now has a `+` method to combine strings.
* `glue_sql()` now collapses zero-length vector into `DBI::SQL("NULL")` (#134 @shrektan).

## Bugfixes and minor changes

@@ -144,6 +144,9 @@ sql_quote_transformer <- function(connection) {
if (should_collapse) {
res <- glue_collapse(res, ", ")
if (length(res) == 0L) {
res <- DBI::SQL("NULL")
@@ -48,6 +48,9 @@ describe("glue_sql", {
expect_identical(glue_sql("{var*}", .con = con, var = "a"), DBI::SQL("'a'"))
expect_identical(glue_sql("{var*}", .con = con, var = letters[1:5]), DBI::SQL("'a', 'b', 'c', 'd', 'e'"))
it('collapses values should return NULL for length zero vector', {
expect_identical(glue_sql("{var*}", .con = con, var = character()), DBI::SQL("NULL"))
it("should return an SQL NULL by default for missing values", {
var <- list(NA, NA_character_, NA_real_, NA_integer_)
expect_identical(glue_sql("x = {var}", .con = con), rep(DBI::SQL("x = NULL"), 4))
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