[
https://issues.apache.org/jira/browse/BEAM-11460?focusedWorklogId=528261&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-528261
]
ASF GitHub Bot logged work on BEAM-11460:
-----------------------------------------
Author: ASF GitHub Bot
Created on: 24/Dec/20 23:34
Start Date: 24/Dec/20 23:34
Worklog Time Spent: 10m
Work Description: anantdamle opened a new pull request #13616:
URL: https://github.com/apache/beam/pull/13616
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.
------------------------
Thank you for your contribution! Follow this checklist to help us
incorporate your contribution quickly and easily:
- [x] Added new tests for the feature in `ParquetIOTest`
- [x] Reviewers - @iemejia @aromanenko-dev
- [x] Update `CHANGES.md` with noteworthy changes.
- [x] If this contribution is large, please file an Apache [Individual
Contributor License Agreement](https://www.apache.org/licenses/icla.pdf).
created instead of [PR/13554](https://github.com/apache/beam/pull/13554) due
to change in source branch.
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Issue Time Tracking
-------------------
Worklog Id: (was: 528261)
Time Spent: 1.5h (was: 1h 20m)
> 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: 1.5h
> 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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