Add a native ParquetIO.ReadRows transform
Open
dsl
improvement
io
java
P3
parquet
sql
- Dominant language
- Java
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Description
ParquetIO today uses Avro's GenericRecord to materialize reads from Parquet records, this implies an extra conversion from GenericRecord to Beam's Row. We can 'push' this conversion into the source read process by implementing a RecordMaterializer that builds Rows at read time xtending Parquet's [ReadSupport](https://github.com/apache/parquet-mr/blob/master/parquet-hadoop/src/main/java/org/apache/parquet/hadoop/api/ReadSupport.java).
Imported from Jira [BEAM-12306](https://issues.apache.org/jira/browse/BEAM-12306). Original Jira may contain additional context.
Reported by: iemejia.
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