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Posted to issues@arrow.apache.org by "pmac0451 (via GitHub)" <gi...@apache.org> on 2026/01/12 16:24:24 UTC

[I] arrow::write_parquet error with zero-length datetimes in R 4.5.2 [arrow]

pmac0451 opened a new issue, #48832:
URL: https://github.com/apache/arrow/issues/48832

   ### Describe the bug, including details regarding any error messages, version, and platform.
   
   ### Description
   Using R 4.5.2 there is an error using `arrow::write_parquet` with zero-length datetimes:
   `Error: Invalid: Invalid conversion to timestamp`
   
   I believe this may be caused by the following change in the [release note](https://cran.r-project.org/doc/manuals/r-patched/[NEWS.2.pdf](https://cran.r-project.org/doc/manuals/r-patched/NEWS.2.pdf)) for R 4.5.2 (patched):
   
   >  `str(x, give.attr=FALSE)` no longer shows attributes when `x` is a zero length "Date" or "POSIXt" object.
   
   I can't be sure if the error was present before the patched release of 4.5.2 on 5 Jan 2026.
   
   ### Reprex
   
   ```
   dplyr::tibble(
       timeStamp = as.POSIXct(x = NULL), # works ok with this line commented out
       otherColumn = character()
     ) |>
     arrow::write_parquet(
       sink = tempfile(fileext = ".parquet")
     )
   ```
   
   ### Component(s)
   
   R


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Re: [I] arrow::write_parquet error with zero-length datetimes in R 4.5.2 [arrow]

Posted by "raulcd (via GitHub)" <gi...@apache.org>.
raulcd commented on issue #48832:
URL: https://github.com/apache/arrow/issues/48832#issuecomment-3744548166

   thanks @shashbha14 , I've assigned you the issue.


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Re: [I] arrow::write_parquet error with zero-length datetimes in R 4.5.2 [arrow]

Posted by "shashbha14 (via GitHub)" <gi...@apache.org>.
shashbha14 commented on issue #48832:
URL: https://github.com/apache/arrow/issues/48832#issuecomment-3744311929

   I would like to work on this issue.


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Re: [I] [R] arrow::write_parquet error with zero-length datetimes in R 4.5.2 [arrow]

Posted by "thisisnic (via GitHub)" <gi...@apache.org>.
thisisnic closed issue #48832: [R] arrow::write_parquet error with zero-length datetimes in R 4.5.2
URL: https://github.com/apache/arrow/issues/48832


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Re: [I] [R] arrow::write_parquet error with zero-length datetimes in R 4.5.2 [arrow]

Posted by "thisisnic (via GitHub)" <gi...@apache.org>.
thisisnic commented on issue #48832:
URL: https://github.com/apache/arrow/issues/48832#issuecomment-4177602976

   Issue resolved by pull request 49619
   https://github.com/apache/arrow/pull/49619


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Re: [I] arrow::write_parquet error with zero-length datetimes in R 4.5.2 [arrow]

Posted by "shashbha14 (via GitHub)" <gi...@apache.org>.
shashbha14 commented on issue #48832:
URL: https://github.com/apache/arrow/issues/48832#issuecomment-3745473862

   @raulcd Yes, I have completed the analysis and solution.
   
   **Root Cause:**
   The crash occurs in [r/src/type_infer.cpp](cci:7://file:///C:/Users/ishwet/.gemini/antigravity/scratch/arrow/r/src/type_infer.cpp:0:0-0:0) at lines 72 and 89. The code checks if the timezone attribute is NULL, but doesn't verify it has content before reading it. In R 4.5.2, zero-length POSIXct objects can have a `tzone` attribute with length 0, causing an out-of-bounds memory access when the code tries to read `STRING_ELT(tzone_sexp, 0)`.
   
   **Solution:**
   Added a length check before accessing the timezone:
   - Changed: `if (Rf_isNull(tzone_sexp))`
   - To: `if (Rf_isNull(tzone_sexp) || XLENGTH(tzone_sexp) == 0)`
   
   Applied to both INTSXP (line 72) and REALSXP (line 89) specializations.
   
   **Testing:**
   Created [r/tests/testthat/test-issue-48832.R](cci:7://file:///C:/Users/ishwet/.gemini/antigravity/scratch/arrow/r/tests/testthat/test-issue-48832.R:0:0-0:0) with a regression test that reproduces the exact scenario from the bug report.
   
   Preparing PR now!


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