Add filter.epi_archive

DESCRIPTION

@@ -1,7 +1,7 @@
 Type: Package
 Package: epiprocess
 Title: Tools for basic signal processing in epidemiology
-Version: 0.11.5
+Version: 0.11.6
 Authors@R: c(
     person("Jacob", "Bien", role = "ctb"),
     person("Logan", "Brooks", , "[email protected]", role = c("aut", "cre")),

NAMESPACE

@@ -32,6 +32,7 @@ S3method(epix_slide,epi_archive)
 S3method(epix_slide,grouped_epi_archive)
 S3method(epix_truncate_versions_after,epi_archive)
 S3method(epix_truncate_versions_after,grouped_epi_archive)
+S3method(filter,epi_archive)
 S3method(group_by,epi_archive)
 S3method(group_by,epi_df)
 S3method(group_by,grouped_epi_archive)

NEWS.md

@@ -8,6 +8,7 @@ Pre-1.0.0 numbering scheme: 0.x will indicate releases, while 0.x.y will indicat
 
 - `is_epi_archive` function has been reintroduced.
 - `epix_as_of_current()` introduced as an alias for `epix_as_of(.$versions_end)`.
+- Added `dplyr::filter` implementation for `epi_archive`s.
 
 # epiprocess 0.11
 

R/archive.R

@@ -52,13 +52,6 @@ validate_version_bound <- function(version_bound, x, na_ok = FALSE,
         class = "epiprocess__version_bound_mismatched_class"
       )
     }
-    if (!identical(typeof(version_bound), typeof(x[["version"]]))) {
-      cli_abort(
-        "{version_bound_arg} must have the same `typeof` as x$version,
-        which has a `typeof` of {typeof(x$version)}",
-        class = "epiprocess__version_bound_mismatched_typeof"
-      )
-    }
   }
 
   return(invisible(NULL))
@@ -207,23 +200,23 @@ next_after.Date <- function(x) x + 1L
 #'   undergo tiny nonmeaningful revisions and the archive object with the
 #'   default setting is too large.
 #' @param clobberable_versions_start Optional; `length`-1; either a value of the
-#'   same `class` and `typeof` as `x$version`, or an `NA` of any `class` and
-#'   `typeof`: specifically, either (a) the earliest version that could be
-#'   subject to "clobbering" (being overwritten with different update data, but
-#'   using the *same* version tag as the old update data), or (b) `NA`, to
-#'   indicate that no versions are clobberable. There are a variety of reasons
-#'   why versions could be clobberable under routine circumstances, such as (a)
-#'   today's version of one/all of the columns being published after initially
-#'   being filled with `NA` or LOCF, (b) a buggy version of today's data being
-#'   published but then fixed and republished later in the day, or (c) data
-#'   pipeline delays (e.g., publisher uploading, periodic scraping, database
-#'   syncing, periodic fetching, etc.) that make events (a) or (b) reflected
-#'   later in the day (or even on a different day) than expected; potential
-#'   causes vary between different data pipelines. The default value is `NA`,
-#'   which doesn't consider any versions to be clobberable. Another setting that
-#'   may be appropriate for some pipelines is `max_version_with_row_in(x)`.
-#' @param versions_end Optional; length-1, same `class` and `typeof` as
-#'   `x$version`: what is the last version we have observed? The default is
+#'   same `class` as `x$version`, or an `NA` of any `class`: specifically,
+#'   either (a) the earliest version that could be subject to "clobbering"
+#'   (being overwritten with different update data, but using the *same* version
+#'   tag as the old update data), or (b) `NA`, to indicate that no versions are
+#'   clobberable. There are a variety of reasons why versions could be
+#'   clobberable under routine circumstances, such as (a) today's version of
+#'   one/all of the columns being published after initially being filled with
+#'   `NA` or LOCF, (b) a buggy version of today's data being published but then
+#'   fixed and republished later in the day, or (c) data pipeline delays (e.g.,
+#'   publisher uploading, periodic scraping, database syncing, periodic
+#'   fetching, etc.) that make events (a) or (b) reflected later in the day (or
+#'   even on a different day) than expected; potential causes vary between
+#'   different data pipelines. The default value is `NA`, which doesn't consider
+#'   any versions to be clobberable. Another setting that may be appropriate for
+#'   some pipelines is `max_version_with_row_in(x)`.
+#' @param versions_end Optional; length-1, same `class` as `x$version`: what is
+#'   the last version we have observed? The default is
 #'   `max_version_with_row_in(x)`, but values greater than this could also be
 #'   valid, and would indicate that we observed additional versions of the data
 #'   beyond `max(x$version)`, but they all contained empty updates. (The default

R/methods-epi_archive.R

@@ -80,19 +80,13 @@ epix_as_of <- function(x, version, min_time_value = -Inf, all_versions = FALSE,
       "`version` must have the same `class` vector as `epi_archive$DT$version`."
     )
   }
-  if (!identical(typeof(version), typeof(x$DT$version))) {
-    cli_abort(
-      "`version` must have the same `typeof` as `epi_archive$DT$version`."
-    )
-  }
   assert_scalar(version, na.ok = FALSE)
   if (version > x$versions_end) {
     cli_abort("`version` must be at most `epi_archive$versions_end`.")
   }
   assert_scalar(min_time_value, na.ok = FALSE)
   min_time_value_inf <- is.infinite(min_time_value) && min_time_value < 0
-  min_time_value_same_type <- typeof(min_time_value) == typeof(x$DT$time_value) &
-    class(min_time_value) == class(x$DT$time_value)
+  min_time_value_same_type <- identical(class(min_time_value), class(x$DT$time_value))
   if (!min_time_value_inf && !min_time_value_same_type) {
     cli_abort("`min_time_value` must be either -Inf or a time_value of the same type and
       class as `epi_archive$time_value`.")
@@ -941,9 +935,6 @@ epix_truncate_versions_after.epi_archive <- function(x, max_version) {
   if (!identical(class(max_version), class(x$DT$version))) {
     cli_abort("`max_version` must have the same `class` as `epi_archive$DT$version`.")
   }
-  if (!identical(typeof(max_version), typeof(x$DT$version))) {
-    cli_abort("`max_version` must have the same `typeof` as `epi_archive$DT$version`.")
-  }
   assert_scalar(max_version, na.ok = FALSE)
   if (max_version > x$versions_end) {
     cli_abort("`max_version` must be at most `epi_archive$versions_end`.")
@@ -1020,3 +1011,163 @@ dplyr_col_modify.col_modify_recorder_df <- function(data, cols) {
   attr(data, "epiprocess::col_modify_recorder_df::cols") <- cols
   data
 }
+
+
+
+#' [`dplyr::filter`] for `epi_archive`s
+#'
+#' @param .data an `epi_archive`
+#' @param ... as in [`dplyr::filter`]; using the `version` column is not allowed
+#'   unless you use `.format_aware = TRUE`; see details.
+#' @param .by as in [`dplyr::filter`]
+#' @param .format_aware optional, `TRUE` or `FALSE`; default `FALSE`. See
+#'   details.
+#'
+#' @details
+#'
+#' By default, using the `version` column or measurement columns is disabled as
+#' it's easy to get unexpected results. See if either [`epix_as_of`] or
+#' [`epix_slide`] works for any version selection you have in mind: for version
+#' selection, see the `version` or `.versions` args, respectively; for
+#' measurement column-based filtering, try `filter`ing after `epix_as_of` or
+#' inside the `.f` in `epix_slide()`. If they don't cover your use case, then
+#' you can set `.format_aware = TRUE` to enable usage of these columns, but be
+#' careful to:
+#' * Factor in that `.data$DT` may have been converted into a compact format
+#'   based on diffing consecutive versions, and the last version of each
+#'   observation in `.data$DT` will always be carried forward to future
+#'   `version`s`; see details of [`as_epi_archive`].
+#' * Set `clobberable_versions_start` and `versions_end` of the result
+#'   appropriately after the `filter` call. They will be initialized with the
+#'   same values as in `.data`.
+#'
+#' `dplyr::filter` also has an optional argument `.preserve`, which should not
+#' have an impact on (ungrouped) `epi_archive`s, and `grouped_epi_archive`s do
+#' not currently support `dplyr::filter`.
+#'
+#' @examples
+#'
+#' # Filter to one location and a particular time range:
+#' archive_cases_dv_subset %>%
+#'   filter(geo_value == "fl", time_value >= as.Date("2020-10-01"))
+#'
+#' # Convert to weekly by taking the Saturday data for each week, so that
+#' # `case_rate_7d_av` represents a Sun--Sat average:
+#' archive_cases_dv_subset %>%
+#'   filter(as.POSIXlt(time_value)$wday == 6L)
+#'
+#' # Filtering involving the `version` column or measurement columns requires
+#' # extra care. See epix_as_of and epix_slide instead for some common
+#' # operations. One semi-common operation that ends up being fairly simple is
+#' # treating observations as finalized after some amount of time, and ignoring
+#' # any revisions that were made after that point:
+#' archive_cases_dv_subset %>%
+#'   filter(
+#'     version <= time_value + as.difftime(60, units = "days"),
+#'     .format_aware = TRUE
+#'   )
+#'
+#' @export
+filter.epi_archive <- function(.data, ..., .by = NULL, .format_aware = FALSE) {
+  in_tbl <- tibble::as_tibble(as.list(.data$DT), .name_repair = "minimal")
+  if (.format_aware) {
+    out_tbl <- in_tbl %>%
+      filter(..., .by = {{ .by }})
+  } else {
+    measurement_colnames <- setdiff(names(.data$DT), key_colnames(.data))
+    forbidden_colnames <- c("version", measurement_colnames)
+    out_tbl <- in_tbl %>%
+      filter(
+        # Add our own fake filter arg to the user's ..., to update the data mask
+        # to prevent `version` column usage.
+        {
+          # We should be evaluating inside the data mask. To disable both
+          # `version` and `.data$version` etc., we need to go to the ancestor
+          # environment containing the data mask's column bindings. This is
+          # likely just the parent env, but search to make sure, in a way akin
+          # to `<<-`:
+          e <- environment()
+          while (!identical(e, globalenv()) && !identical(e, emptyenv())) { # nolint:vector_logic_linter
+            if ("version" %in% names(e)) {
+              # This is where the column bindings are. Replace the forbidden ones.
+              # They are expected to be active bindings, so directly
+              # assigning has issues; `rm` first.
+              rm(list = forbidden_colnames, envir = e)
+              eval_env <- new.env(parent = asNamespace("epiprocess")) # see (2) below
+              delayedAssign(
+                "version",
+                cli_abort(c(
+                  "Using `version` in `filter.epi_archive` may produce unexpected results.",
+                  ">" = "See if `epix_as_of` or `epix_slide` would work instead.",
+                  ">" = "If not, see `?filter.epi_archive` details for how to proceed."
+                ), class = "epiprocess__filter_archive__used_version"),
+                eval.env = eval_env,
+                assign.env = e
+              )
+              for (measurement_colname in measurement_colnames) {
+                # Record current `measurement_colname` and set up execution for
+                # the promise for the error in its own dedicated environment, so
+                # that (1) `for` loop updating its value and `rm` cleanup don't
+                # mess things up. We can also (2) prevent changes to data mask
+                # ancestry (to involve user's quosure env rather than our
+                # quosure env) or contents (from edge case of user binding
+                # functions inside the mask) from potentially interfering by
+                # setting the promise's execution environment to skip over the
+                # data mask.
+                eval_env <- new.env(parent = asNamespace("epiprocess"))
+                eval_env[["local_measurement_colname"]] <- measurement_colname
+                delayedAssign(
+                  measurement_colname,
+                  cli_abort(c(
+                    "Using `{format_varname(local_measurement_colname)}`
+                     in `filter.epi_archive` may produce unexpected results.",
+                    ">" = "See `?filter.epi_archive` details for how to proceed."
+                  ), class = "epiprocess__filter_archive__used_measurement"),
+                  eval.env = eval_env,
+                  assign.env = e
+                )
+              }
+              break
+            }
+            e <- parent.env(e)
+          }
+          # Don't mask similarly-named user objects in ancestor envs:
+          rm(list = c("e", "measurement_colname", "eval_env"))
+          TRUE
+        },
+        ...,
+        .by = {{ .by }}
+      )
+  }
+  # We could try to re-infer the geo_type, e.g., when filtering from
+  # national+state to just state. However, we risk inference failures such as
+  # "hrr" -> "hhs" from filtering to hrr 10, or "custom" -> USA-related when
+  # working with non-USA data:
+  out_geo_type <- .data$geo_type
+  if (.data$time_type == "day") {
+    # We might be going from daily to weekly; re-infer:
+    out_time_type <- guess_time_type(out_tbl$time_value)
+  } else {
+    # We might be filtering weekly to a single time_value; avoid re-inferring to
+    # stay "week". Or in other cases, just skip inferring, as re-inferring is
+    # expected to match the input time_type:
+    out_time_type <- .data$time_type
+  }
+  # Even if they narrow down to just a single value of an other_keys column,
+  # it's probably still better (& simpler) to treat it as an other_keys column
+  # since it still exists in the result:
+  out_other_keys <- .data$other_keys
+  # `filter` makes no guarantees about not aliasing columns in its result when
+  # the filter condition is all TRUE, so don't setDT.
+  out_dtbl <- as.data.table(out_tbl, key = out_other_keys)
+  result <- new_epi_archive(
+    out_dtbl,
+    out_geo_type, out_time_type, out_other_keys,
+    # Assume version-related metadata unchanged; part of why we want to push
+    # back on filter expressions like `.data$version <= .env$as_of`:
+    .data$clobberable_versions_start, .data$versions_end
+  )
+  # Filtering down rows while keeping all (ukey) columns should preserve ukey
+  # uniqueness.
+  result
+}

R/methods-epi_df.R

@@ -532,7 +532,7 @@ sum_groups_epi_df <- function(.x, sum_cols, group_cols = "time_value") {
   if (!"geo_value" %in% group_cols) {
     out <- out %>%
       mutate(geo_value = "total") %>%
-      relocate(.data$geo_value, .before = 1)
+      relocate("geo_value", .before = 1)
   }
 
   # The `geo_type` will be correctly inherited here by the following logic:

_pkgdown.yml

@@ -72,8 +72,9 @@ reference:
       - epix_as_of
       - epix_as_of_current
       - epix_slide
-      - epix_merge
       - revision_summary
+      - epix_merge
+      - filter.epi_archive
       - epix_fill_through_version
       - epix_truncate_versions_after
       - set_versions_end