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Attaching a table to a shape element can drop its shapes

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Issue 类型
缺陷
描述清晰度
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技术栈
r
领域
data

调研方向

从 R/utils.R 中的 .sync_shapes_on_drop() 开始,并将其实例匹配方式与 .sync_tables_on_crop() 中描述的查找方式进行比较。使用示例 store 和实例 ID 从 0 开始的表格,重现行被删除时的行为。完成标准是附加表格后保留所有匹配的 shape 行;为这种情况添加回归测试。

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描述

When a table annotating a shape element is attached, .sync_shapes_on_drop() subsets the element with

y <- y[match(instances(t), instances(y), nomatch = 0)]

(R/utils.R, line 45, at 58ec915). For a shape element without an instance_key attribute, instances(y) returns seq_len(nrow(y)), so the table's instance values end up matched against row positions. With ids that start at 0, the last shape goes missing.

A reprex with the example store, on spatialdataR 0.99.44:

library(spatialdataR)
x <- readSpatialData(system.file("extdata", "blobs.zarr", package = "spatialdataR"))
nrow(shape(x, "blobs_circles"))
#> [1] 5
t <- table(x)[, 1:5]
regions(t) <- "blobs_circles"
instances(t) <- 0:4
table(x, "circles") <- t
nrow(shape(x, "blobs_circles"))
#> [1] 4

With a two-column table and instances(t) <- c(4L, 5L), the element ends up with no rows at all, although shape(x, "blobs_circles")[c(4, 5)] on its own returns two.

The same happens when reading two of the example stores in the BiocSpatialData OSN bucket. In merfish.zarr.zip, cells has 2,389 rows in shapes.parquet and 2,389 columns in the table, but 2,388 rows after readSpatialData(); in visium_associated_xenium_io_aligned.zip the spots go from 4,992 to 4,991. Both number their instances from 0. With tables = FALSE every row is there, and xenium_rep1_io_aligned.zip, whose ids start at 1, keeps all of them.

In these stores the ids sit in a column named after the table's instance key (cell_id, spot_id), which is what .sync_tables_on_crop() already looks for with if (ik %in% names(e)) e[[ik]], so the same lookup would probably fix it here. Something else I noticed along the way: [ on a shape element keeps rows in their stored order, so circles[c(3, 1)] returns rows 1 and 3.

This may fit with #195. Happy to put together a PR with a test if that helps.

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