Comments (4)
Hi @smf-srogozins,
Parquet4s should be able to read both the current and the legacy format of maps. It ignores the name of the group (it doesn't care if it is named map
or key_value
). The name is used only during writing. You can check it in the code: https://github.com/mjakubowski84/parquet4s/blob/master/core/src/main/scala/com/github/mjakubowski84/parquet4s/ParquetRecord.scala#L682. If I missed something and the backwards compatibility is not met then do not hesitate and propose a fix. PRs are warmly welcome :)
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OK, that's weird. To double check this, I tried generating a similar file with version 1.11.0 of parquet4s and I am not seeing the error with that file. Need to spend more time to understand the cause, because the error specifically complains about key_value not found in optional group myMap (MAP)
. Not sure if that is useful, but this also only seems to occur when I am using projection, also I believe the failing parquet files were generated using Apache Iceberg.
from parquet4s.
Not sure if that is useful, but this also only seems to occur when I am using projection
Oh, yes, it is useful. When using projection, you define the exact schema you expect from the file you read. And when using Parquet 1.12, the schema will contain key_value
, which does not match your data.
There are two ways to work around this:
- do not use projection (which is not ideal, I guess)
- provide your own schema definition for a Map; that is, you have to implement your own type class, like this one: https://github.com/mjakubowski84/parquet4s/blob/master/core/src/main/scala/com/github/mjakubowski84/parquet4s/Schema.scala#L308 but using your own field names.
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Hint: you can use https://github.com/mjakubowski84/parquet4s/blob/master/core/src/main/scala/com/github/mjakubowski84/parquet4s/Schema.scala#L82 to build your own schema def easily.
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Related Issues (20)
- Add Pekko support HOT 4
- Is it possible to write a file without Akka or Fs2 integration? HOT 2
- `ParquetReader.projectedGeneric` does not work when selecting more than one column from a same group HOT 5
- Reading from gcs bucket HOT 1
- Do not publish a pekko/akko versions of scapapb module HOT 1
- missing tail records of large(~193M) parquet files HOT 4
- Protobuf enums deserialisation HOT 3
- compatible parquet-hadoop with spark3.1 HOT 3
- Unsure how to use for 'semiauto' approach HOT 2
- ParquetSchemaResolver test fails on recent JVMs HOT 1
- [akka/pekko] Too many paths created during record partitioning HOT 2
- [RFC] Refactor timestamp codecs HOT 2
- Feature request: Expose partitions as a `Stream[F, Stream[F, Record]]` for FS2 HOT 5
- Incorrect value after reading parquet HOT 7
- [Question] get a listing of parquet files? HOT 4
- [Question] Is there a mechanism to detect when the `rotatingWriter` finishes writing to a file and to be notified of the file that was written? HOT 1
- Support vectored io introduced in Parquet 1.14 HOT 1
- Efficent way to read big files? HOT 2
- Possiblity to write avro IndexedRecords to Parquet using ParquetStreams HOT 3
- feat(akkaPekko): Retry mechanism for ParquetPartitioningFlow HOT 4
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