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combineList: BACKEND Argument not working as intended #119

Description

@Apompetti-Cori
#test combineList function bsseq
#Noticed it still loads assays into memory after combination
M <- matrix(0:8, 3, 3)
Cov <- matrix(1:9, 3, 3)
hdf5_M <- writeHDF5Array(M)
hdf5_Cov <- writeHDF5Array(Cov)
hdf5_BS1 <- BSseq(chr = c("chr1", "chr2", "chr1"),
                  pos = c(1, 2, 3),
                  M = hdf5_M,
                  Cov = hdf5_Cov,
                  sampleNames = c("A", "B", "C"))

hdf5_BS1

hdf5_BS2 <- BSseq(chr = c("chr1", "chr1", "chr1"),
                  pos = c(3, 4, 5),
                  M = hdf5_M,
                  Cov = hdf5_Cov,
                  sampleNames = c("D", "E", "F"))

hdf5_BS2

x <- combineList(list(hdf5_BS1, hdf5_BS2), BACKEND = "HDF5Array")
x
> sessionInfo()
R version 4.2.1 (2022-06-23)
Platform: x86_64-pc-linux-gnu (64-bit)
Running under: CentOS Linux 7 (Core)

Matrix products: default
BLAS/LAPACK: /usr/lib64/libopenblasp-r0.3.3.so

locale:
 [1] LC_CTYPE=en_US.UTF-8       LC_NUMERIC=C              
 [3] LC_TIME=en_US.UTF-8        LC_COLLATE=en_US.UTF-8    
 [5] LC_MONETARY=en_US.UTF-8    LC_MESSAGES=en_US.UTF-8   
 [7] LC_PAPER=en_US.UTF-8       LC_NAME=C                 
 [9] LC_ADDRESS=C               LC_TELEPHONE=C            
[11] LC_MEASUREMENT=en_US.UTF-8 LC_IDENTIFICATION=C       

attached base packages:
[1] stats4    stats     graphics  grDevices utils     datasets  methods  
[8] base     

other attached packages:
 [1] shiny_1.7.4                 HDF5Array_1.26.0           
 [3] DelayedArray_0.24.0         Matrix_1.5-3               
 [5] plotly_4.10.1               PCAtools_2.10.0            
 [7] ggrepel_0.9.3               lubridate_1.9.2            
 [9] forcats_1.0.0               stringr_1.5.0              
[11] dplyr_1.1.1                 purrr_1.0.1                
[13] readr_2.1.4                 tidyr_1.3.0                
[15] tibble_3.2.1                ggplot2_3.4.1              
[17] tidyverse_2.0.0             MethylResolver_0.1.0       
[19] methylSig_1.10.0            here_1.0.1                 
[21] bsseq_1.34.0                SummarizedExperiment_1.28.0
[23] Biobase_2.58.0              MatrixGenerics_1.10.0      
[25] matrixStats_0.63.0          GenomicRanges_1.50.2       
[27] GenomeInfoDb_1.34.9         IRanges_2.32.0             
[29] S4Vectors_0.36.2            BiocGenerics_0.44.0        
[31] rhdf5_2.42.0               

loaded via a namespace (and not attached):
  [1] snow_0.4-4                plyr_1.8.8               
  [3] lazyeval_0.2.2            splines_4.2.1            
  [5] BiocParallel_1.32.6       digest_0.6.31            
  [7] foreach_1.5.2             htmltools_0.5.5          
  [9] rsconnect_0.8.29          fansi_1.0.4              
 [11] magrittr_2.0.3            memoise_2.0.1            
 [13] BSgenome_1.66.3           ScaledMatrix_1.6.0       
 [15] doParallel_1.0.17         tzdb_0.3.0               
 [17] limma_3.54.2              Metrics_0.1.4            
 [19] Biostrings_2.66.0         R.utils_2.12.2           
 [21] timechange_0.2.0          colorspace_2.1-0         
 [23] xfun_0.38                 crayon_1.5.2             
 [25] RCurl_1.98-1.12           jsonlite_1.8.4           
 [27] iterators_1.0.14          glue_1.6.2               
 [29] polyclip_1.10-4           gtable_0.3.3             
 [31] zlibbioc_1.44.0           XVector_0.38.0           
 [33] BiocSingular_1.14.0       Rhdf5lib_1.20.0          
 [35] DEoptimR_1.0-11           scales_1.2.1             
 [37] Rcpp_1.0.10               viridisLite_0.4.1        
 [39] xtable_1.8-4              DSS_2.46.0               
 [41] dqrng_0.3.0               rsvd_1.0.5               
 [43] htmlwidgets_1.6.2         httr_1.4.5               
 [45] ellipsis_0.3.2            varhandle_2.0.5          
 [47] pkgconfig_2.0.3           XML_3.99-0.14            
 [49] R.methodsS3_1.8.2         farver_2.1.1             
 [51] sass_0.4.5                locfit_1.5-9.7           
 [53] utf8_1.2.3                tidyselect_1.2.0         
 [55] rlang_1.1.0               reshape2_1.4.4           
 [57] later_1.3.0               munsell_0.5.0            
 [59] tools_4.2.1               cachem_1.0.7             
 [61] cli_3.6.1                 generics_0.1.3           
 [63] fastmap_1.1.1             yaml_2.3.7               
 [65] knitr_1.42                robustbase_0.95-1        
 [67] randomForest_4.7-1.1      sparseMatrixStats_1.10.0 
 [69] mime_0.12                 R.oo_1.25.0              
 [71] compiler_4.2.1            rstudioapi_0.14          
 [73] tweenr_2.0.2              job_0.3.0                
 [75] bslib_0.4.2               stringi_1.7.12           
 [77] lattice_0.20-45           permute_0.9-7            
 [79] vctrs_0.6.1               trqwe_0.1                
 [81] pillar_1.9.0              lifecycle_1.0.3          
 [83] rhdf5filters_1.10.0       jquerylib_0.1.4          
 [85] data.table_1.14.8         cowplot_1.1.1            
 [87] bitops_1.0-7              irlba_2.3.5.1            
 [89] httpuv_1.6.9              rtracklayer_1.58.0       
 [91] R6_2.5.1                  BiocIO_1.8.0             
 [93] promises_1.2.0.1          codetools_0.2-19         
 [95] MASS_7.3-58.3             gtools_3.9.4             
 [97] rprojroot_2.0.3           rjson_0.2.21             
 [99] withr_2.5.0               GenomicAlignments_1.34.1 
[101] Rsamtools_2.14.0          GenomeInfoDbData_1.2.9   
[103] parallel_4.2.1            doSNOW_1.0.20            
[105] hms_1.1.3                 grid_4.2.1               
[107] beachmat_2.14.0           DelayedMatrixStats_1.20.0
[109] ggforce_0.4.1             restfulr_0.0.15 

When supplying the BACKEND="HDF5Array" as an argument for combineList, the resulting combined object is still loaded in memory.

Here is my output:

> x <- combineList(list(hdf5_BS1, hdf5_BS2), BACKEND = "HDF5Array")
> x
An object of type 'BSseq' with
  5 methylation loci
  6 samples
has not been smoothed
All assays are in-memory

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