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https://issues.apache.org/jira/browse/BEAM-11460?focusedWorklogId=528224&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-528224
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ASF GitHub Bot logged work on BEAM-11460:
-----------------------------------------
Author: ASF GitHub Bot
Created on: 24/Dec/20 17:30
Start Date: 24/Dec/20 17:30
Worklog Time Spent: 10m
Work Description: iemejia commented on a change in pull request #13554:
URL: https://github.com/apache/beam/pull/13554#discussion_r548641539
##########
File path: CHANGES.md
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@@ -58,6 +58,7 @@
* ReadFromMongoDB/WriteToMongoDB will mask password in display_data (Python)
([BEAM-11444](https://issues.apache.org/jira/browse/BEAM-11444).)
* Support for X source added (Java/Python)
([BEAM-X](https://issues.apache.org/jira/browse/BEAM-X)).
* There is a new transform `ReadAllFromBigQuery` that can receive multiple
requests to read data from BigQuery at pipeline runtime. See [PR
13170](https://github.com/apache/beam/pull/13170), and
[BEAM-9650](https://issues.apache.org/jira/browse/BEAM-9650).
+* ParquetIO can now read files with an unknown schema. See
[PR-13554](https://github.com/apache/beam/pull/13554) and
([BEAM-11460](https://issues.apache.org/jira/browse/BEAM-11460))
Review comment:
Can you move this up to the 2.28.0 section. The 2.27.0 was already
merged (sorry I missed this in previous check.
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Issue Time Tracking
-------------------
Worklog Id: (was: 528224)
Time Spent: 1h 20m (was: 1h 10m)
> Support reading Parquet files with unknown schema
> -------------------------------------------------
>
> Key: BEAM-11460
> URL: https://issues.apache.org/jira/browse/BEAM-11460
> Project: Beam
> Issue Type: New Feature
> Components: io-java-parquet
> Reporter: Anant Damle
> Priority: P1
> Labels: Parquet
> Original Estimate: 336h
> Time Spent: 1h 20m
> Remaining Estimate: 0h
>
> Data engineers encounter times when schema of Parquet file is unknown at the
> time of writing the pipeline or multiple schema may be present in different
> files. Reading Parquet files using ParquetIO requires providing an Avro
> (equivalent) schema, Many a times its not possible to know the schema of the
> Parquet files.
> On the other hand
> [AvroIO|https://beam.apache.org/releases/javadoc/2.26.0/org/apache/beam/sdk/io/AvroIO.html]
> supports reading unknow schema files by providing a parse function :
> {{*#parseGenericRecords(SerializableFunction<GenericRecord,T>)*}}
> Supporting this functionality in ParquetIO is simple and requires minimal
> changes to the ParquetIO surface.
> {code}
> Pipeline p = ...;
> PCollection<String> filepatterns = p.apply(...);
> PCollection<Foo> records =
> filepatterns
> .apply(FileIO.matchAll())
> .apply(FileIO.readMatches())
> .apply(ParquetIO.parseGenericRecords(new
> SerializableFunction<GenericRecord, Foo>() {
> public Foo apply(GenericRecord record) {
> // If needed, access the schema of the record using
> record.getSchema()
> return ...;
> }
> }));
> {code}
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