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Posted to commits@parquet.apache.org by "emkornfield (via GitHub)" <gi...@apache.org> on 2025/12/19 18:28:14 UTC

[PR] Rephrase external column data. [parquet-site]

emkornfield opened a new pull request, #145:
URL: https://github.com/apache/parquet-site/pull/145

   Based on support matrix I believe this was meant to capture Parquet summary files ("_metadata") and not reading external data.


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Re: [PR] Rephrase external column data. [parquet-site]

Posted by "emkornfield (via GitHub)" <gi...@apache.org>.
emkornfield commented on code in PR #145:
URL: https://github.com/apache/parquet-site/pull/145#discussion_r2660295324


##########
data/implementations/features/api-features.yaml:
##########
@@ -1,8 +1,8 @@
 category_id: api-features
 features:
-  - id: api-external-column-data
-    display_name: External column data
-    note: "In parquet.thrift: ColumnChunk->file_path"
+  - id: api-parquet-summary-file
+    display_name: Parquet summary file
+    note: "Files named _metadata that consolidate footers from multiple parquet files."

Review Comment:
   Yeah, I'd err on not including that a reference to file_path here. 
   
   > In fact is there anything in the spec about summary file or is that just an implementation choice some people made?
   
   There is not https://github.com/apache/parquet-format/pull/542 has some more details.



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Re: [PR] Rephrase external column data. [parquet-site]

Posted by "alamb (via GitHub)" <gi...@apache.org>.
alamb commented on code in PR #145:
URL: https://github.com/apache/parquet-site/pull/145#discussion_r2645636889


##########
data/implementations/features/api-features.yaml:
##########
@@ -1,8 +1,8 @@
 category_id: api-features
 features:
-  - id: api-external-column-data
-    display_name: External column data
-    note: "In parquet.thrift: ColumnChunk->file_path"
+  - id: api-parquet-summary-file
+    display_name: Parquet summary file
+    note: "Files named _metadata that consolidate footers from multiple parquet files."

Review Comment:
   I think the reference to the `file_path` field will help keep this specific. So perhaps something like 
   
   ```suggestion
       note: "Files named _metadata that consolidate footers from multiple parquet files, stored in ColumnChunk->file_path"
   ```



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Re: [PR] Rephrase external column data. [parquet-site]

Posted by "emkornfield (via GitHub)" <gi...@apache.org>.
emkornfield merged PR #145:
URL: https://github.com/apache/parquet-site/pull/145


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Re: [PR] Rephrase external column data. [parquet-site]

Posted by "emkornfield (via GitHub)" <gi...@apache.org>.
emkornfield commented on PR #145:
URL: https://github.com/apache/parquet-site/pull/145#issuecomment-3725068668

   going to merge.  Thanks for the reviews.


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Re: [PR] Rephrase external column data. [parquet-site]

Posted by "emkornfield (via GitHub)" <gi...@apache.org>.
emkornfield commented on code in PR #145:
URL: https://github.com/apache/parquet-site/pull/145#discussion_r2635933446


##########
data/implementations/support/hyparquet.yaml:
##########
@@ -113,8 +113,8 @@ support:
     status: unknown
   format-data-page-v2:
     status: full
-  api-external-column-data:
-    status: full
+  api-parquet-summary-file:
+    status: none

Review Comment:
   @platypii I looked at hyparquet documentation quickly and didn't see this mentioned but please let me know if I missed it.



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Re: [PR] Rephrase external column data. [parquet-site]

Posted by "platypii (via GitHub)" <gi...@apache.org>.
platypii commented on code in PR #145:
URL: https://github.com/apache/parquet-site/pull/145#discussion_r2646204830


##########
data/implementations/features/api-features.yaml:
##########
@@ -1,8 +1,8 @@
 category_id: api-features
 features:
-  - id: api-external-column-data
-    display_name: External column data
-    note: "In parquet.thrift: ColumnChunk->file_path"
+  - id: api-parquet-summary-file
+    display_name: Parquet summary file
+    note: "Files named _metadata that consolidate footers from multiple parquet files."

Review Comment:
   Is "parquet summary file" really the same as supporting `file_path`?
   
   Maybe summary files are the only known use case of actually using `file_path`? But nothing in the spec says file_path is necessarily associated with "summary files". In fact is there anything in the spec about summary file or is that just an implementation choice some people made?
   
   I'm not opposed to having a row for support of summary files, but that seems like a different question than `file_path` support?



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