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#' @export
#' @rdname sql_build
lazy_multi_join_query <- function(x,
joins,
table_names,
vars,
group_vars = op_grps(x),
order_vars = op_sort(x),
frame = op_frame(x),
call = caller_env()) {
stopifnot(inherits(x, "lazy_query"))
if (!identical(colnames(joins), c("table", "type", "by_x_table_id", "by"))) {
cli_abort("`joins` must have fields `table`, `type`, `by_x_table_id`, `by`", .internal = TRUE)
}
vctrs::vec_assert(joins$type, character(), arg = "joins$type", call = caller_env())
if (!identical(colnames(table_names), c("name", "from"))) {
cli_abort("`table_names` must have fields `name`, `from`", .internal = TRUE)
}
vctrs::vec_assert(table_names$name, character(), arg = "table_names$as", call = caller_env())
vctrs::vec_assert(table_names$from, character(), arg = "table_names$from", call = caller_env())
if (!identical(colnames(vars), c("name", "table", "var"))) {
cli_abort("`vars` must have fields `name`, `table`, `var`", .internal = TRUE)
}
vctrs::vec_assert(vars$name, character(), arg = "vars$name", call = caller_env())
vctrs::vec_assert(vars$table, list(), arg = "vars$table", call = caller_env())
vctrs::vec_assert(vars$var, list(), arg = "vars$var", call = caller_env())
lazy_query(
query_type = "multi_join",
x = x,
joins = joins,
table_names = table_names,
vars = vars,
group_vars = group_vars,
order_vars = order_vars,
frame = frame
)
}
join_check_vars <- function(vars, call) {
if (!vctrs::vec_is_list(vars)) {
# TODO use `cli_abort()` after https://github.com/r-lib/rlang/issues/1386
# is fixed
abort("`vars` must be a list", .internal = TRUE)
}
if (!identical(names(vars), c("alias", "x", "y", "all_x", "all_y"))) {
# TODO use `cli_abort()` after https://github.com/r-lib/rlang/issues/1386
# is fixed
abort("`vars` must have fields `alias`, `x`, `y`, `all_x`, and `all_y`", .internal = TRUE)
}
n <- vctrs::vec_size(vars$alias)
vctrs::vec_assert(vars$alias, character(), arg = "vars$alias", call = call)
vctrs::vec_assert(vars$x, character(), size = n, arg = "vars$x", call = call)
vctrs::vec_assert(vars$y, character(), size = n, arg = "vars$y", call = call)
vctrs::vec_assert(vars$all_x, character(), arg = "vars$all_x", call = call)
vctrs::vec_assert(vars$all_y, character(), arg = "vars$all_y", call = call)
}
join_check_by <- function(by, call) {
if (!vctrs::vec_is_list(by)) {
# TODO use `cli_abort()` after https://github.com/r-lib/rlang/issues/1386
# is fixed
abort("`by` must be a list", .internal = TRUE)
}
vctrs::vec_assert(by$x, character(), arg = "by$x", call = call)
vctrs::vec_assert(by$y, character(), arg = "by$y", call = call)
if (vctrs::vec_size(by$x) != vctrs::vec_size(by$y)) {
# TODO use `cli_abort()` after https://github.com/r-lib/rlang/issues/1386
# is fixed
abort("`by$x` and `by$y` must have the same size", .internal = TRUE)
}
vctrs::vec_assert(by$x_as, ident(), size = 1L, arg = "by$x_as", call = call)
vctrs::vec_assert(by$y_as, ident(), size = 1L, arg = "by$y_as", call = call)
}
#' @export
#' @rdname sql_build
lazy_semi_join_query <- function(x,
y,
vars,
anti,
by,
na_matches = c("never", "na"),
group_vars = op_grps(x),
order_vars = op_sort(x),
frame = op_frame(x),
call = caller_env()) {
stopifnot(inherits(x, "lazy_query"))
stopifnot(inherits(y, "lazy_query"))
assert_flag(anti, "anti", call = call)
join_check_by(by, call)
na_matches <- arg_match(na_matches, c("never", "na"), error_call = call)
lazy_query(
query_type = "semi_join",
x = x,
y = y,
anti = anti,
by = by,
na_matches = na_matches,
vars = vars,
group_vars = group_vars,
order_vars = order_vars,
frame = frame
)
}
#' @export
print.lazy_semi_join_query <- function(x, ...) {
cat_line("<SQL ", if (x$anti) "ANTI" else "SEMI", " JOIN>")
cat_line("By:")
cat_line(indent(paste0(x$by$x, "-", x$by$y)))
cat_line("X:")
cat_line(indent_print(sql_build(x$x, simulate_dbi())))
cat_line("Y:")
cat_line(indent_print(sql_build(x$y, simulate_dbi())))
}
#' @export
op_vars.lazy_multi_join_query <- function(op) {
op$vars$name
}
#' @export
op_vars.lazy_semi_join_query <- function(op) {
op$vars$name
}
#' @export
sql_build.lazy_multi_join_query <- function(op, con, ...) {
table_names_out <- generate_join_table_names(op$table_names)
if (length(table_names_out) > 2 || !op$joins$type %in% c("full", "right")) {
table_vars <- purrr::map(
set_names(c(list(op$x), op$joins$table), table_names_out),
op_vars
)
op$joins$table <- purrr::map(op$joins$table, ~ sql_optimise(sql_build(.x, con), con))
op$joins$by <- purrr::map2(
op$joins$by, seq_along(op$joins$by),
function(by, i) {
by$x_as <- ident(table_names_out[op$joins$by_x_table_id[[i]]])
by$y_as <- ident(table_names_out[i + 1L])
by
}
)
out <- multi_join_query(
x = sql_optimise(sql_build(op$x, con), con),
joins = op$joins,
table_vars = table_vars,
vars = op$vars
)
return(out)
}
# construct a classical `join_query()` so that special handling of
# full and right join continue to work
type <- op$joins$type
x_idx <- purrr::map_lgl(op$vars$table, ~ 1L %in% .x)
vars_x <- purrr::map2_chr(op$vars$var, x_idx, ~ {if (.y) .x[[1]] else NA_character_})
y_idx <- purrr::map_lgl(op$vars$table, ~ 2L %in% .x)
vars_y <- purrr::map2_chr(op$vars$var, y_idx, ~ {if (.y) dplyr::last(.x) %||% .x[[1]] else NA_character_})
vars_classic <- list(
alias = op$vars$name,
x = vars_x,
y = vars_y,
all_x = op_vars(op$x),
all_y = op_vars(op$joins$table[[1]])
)
by <- op$joins$by[[1]]
by$x_as <- ident(table_names_out[[1]])
by$y_as <- ident(table_names_out[[2]])
join_query(
sql_optimise(sql_build(op$x, con), con),
sql_optimise(sql_build(op$joins$table[[1]], con), con),
vars = vars_classic,
type = type,
by = by,
suffix = NULL, # it seems like the suffix is not used for rendering
na_matches = by$na_matches
)
}
generate_join_table_names <- function(table_names) {
if (length(table_names$name) != 2) {
table_names_repaired <- vctrs::vec_as_names(table_names$name, repair = "unique", quiet = TRUE)
auto_name <- table_names$from != "as"
table_names$name[auto_name] <- table_names_repaired[auto_name]
return(table_names$name)
}
join_two_table_alias(table_names$name, table_names$from)
}
#' @export
sql_build.lazy_semi_join_query <- function(op, con, ...) {
vars_prev <- op_vars(op$x)
if (identical(op$vars$var, op$vars$name) &&
identical(op$vars$var, vars_prev)) {
vars <- sql("*")
} else {
vars <- ident(set_names(op$vars$var, op$vars$name))
}
semi_join_query(
sql_optimise(sql_build(op$x, con), con),
sql_optimise(sql_build(op$y, con), con),
vars = vars,
anti = op$anti,
by = op$by,
na_matches = op$na_matches
)
}
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