8000 Add support for `WRITE_EMPTY_FILE` option to `COPY` - which allows skipping of writing empty files by Mytherin · Pull Request #16737 · duckdb/duckdb · GitHub
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Add support for WRITE_EMPTY_FILE option to COPY - which allows skipping of writing empty files #16737

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Merged
merged 2 commits into from
Mar 20, 2025
Merged

Add support for WRITE_EMPTY_FILE option to COPY - which allows skipping of writing empty files #16737

merged 2 commits into from
Mar 20, 2025

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Mytherin
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By default, COPY writes an empty file when no rows are supplied. The new WRITE_EMPTY_FILE option allows this behavior to be controlled. If WRITE_EMPTY_FILE false is supplied - and no rows are submitted to the COPY command - nothing is written to disk.

For example:

D copy (select 42 limit 0) to 'file.parquet' (RETURN_FILES);
┌───────┬────────────────┐
│ Count │     Files      │
│ int64 │   varchar[]    │
├───────┼────────────────┤
│   0   │ [file.parquet] │
└───────┴────────────────┘
D copy (select 42 limit 0) to 'file.parquet' (RETURN_FILES, WRITE_EMPTY_FILE false);
┌───────┬───────────┐
│ Count │   Files   │
│ int64 │ varchar[] │
├───────┼───────────┤
│   0   │ []        │
└───────┴───────────┘

Mytherin added 2 commits March 19, 2025 17:11
< 8000 div data-view-component="true" class="TimelineItem TimelineItem--condensed">
@Mytherin
Add support for WRITE_EMPTY_FILE false option - which allows skipping…
c3e77eb 
… of writing empty files
@Mytherin
Remove unnecessary string UUID functions
caa8759
@Mytherin Mytherin merged commit 6e4e480 into duckdb:main Mar 20, 2025
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@Mytherin Mytherin deleted the skipemptyfilewrite branch April 2, 2025 09:23
krlmlr added a commit to duckdb/duckdb-r that referenced this pull request May 15, 2025
@krlmlr
vendor: Update vendored sources to duckdb/duckdb@6e4e480
a7e0be1 
Add support for `WRITE_EMPTY_FILE` option to `COPY` - which allows skipping of writing empty files (duckdb/duckdb#16737)
krlmlr added a commit to duckdb/duckdb-r that referenced this pull request May 15, 2025
@krlmlr
vendor: Update vendored sources to duckdb/duckdb@6e4e480
70d4034 
Add support for `WRITE_EMPTY_FILE` option to `COPY` - which allows skipping of writing empty files (duckdb/duckdb#16737)
krlmlr added a commit to duckdb/duckdb-r that referenced this pull request May 16, 2025
@krlmlr
vendor: Update vendored sources to duckdb/duckdb@6e4e480
d21c97c 
Add support for `WRITE_EMPTY_FILE` option to `COPY` - which allows skipping of writing empty files (duckdb/duckdb#16737)
krlmlr added a commit to duckdb/duckdb-r that referenced this pull request May 16, 2025
@krlmlr
vendor: Update vendored sources to duckdb/duckdb@6e4e480
f8eff7e 
Add support for `WRITE_EMPTY_FILE` option to `COPY` - which allows skipping of writing empty files (duckdb/duckdb#16737)
krlmlr added a commit to duckdb/duckdb-r that referenced this pull request May 17, 2025
@krlmlr
vendor: Update vendored sources to duckdb/duckdb@6e4e480
a49dc59 
Add support for `WRITE_EMPTY_FILE` option to `COPY` - which allows skipping of writing empty files (duckdb/duckdb#16737)
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