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This was referenced May 24, 2023
alamb
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May 24, 2023
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I recommend adding a doc comment from append_column added in #4269 to this binary as an example of how to use it
I tested this out with some local parquet data:
parquet-concat combined.parquet 1.parquet 2.parquet
(arrow_dev) alamb@MacBook-Pro-8:~/Downloads$ du -s -h 1.parquet 2.parquet combined.parquet
69M 1.parquet
40K 2.parquet
69M combined.parquet+-----------------+
| COUNT(UInt8(1)) |
+-----------------+
| 9332578 |
+-----------------+
1 row in set. Query took 0.007 seconds.
❯ select count(*) from '2.parquet';
+-----------------+
| COUNT(UInt8(1)) |
+-----------------+
| 637 |
+-----------------+
❯ select count(*) from 'combined.parquet';
+-----------------+
| COUNT(UInt8(1)) |
+-----------------+
| 9333215 |
+-----------------+
❯ select avg(value) from (select value from '1.parquet' UNION ALL select value from '2.parquet');
+----------------------+
| AVG(1.parquet.value) |
+----------------------+
| 82.11578603943015 |
+----------------------+
1 row in set. Query took 0.035 seconds.
❯ select avg(value) from 'combined.parquet';
+-----------------------------+
| AVG(combined.parquet.value) |
+-----------------------------+
| 82.11578603943015 |
+-----------------------------+
1 row in set. Query took 0.015 seconds.Works great for me 🚀
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Which issue does this PR close?
Closes #.
Rationale for this change
Adds a CLI tool for efficiently concatenating parquet files, this definitely could be made more sophisticated, but serves as a demo of how to use the new API added in #4269 whilst also providing some utility to users
What changes are included in this PR?
Are there any user-facing changes?