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https://issues.apache.org/jira/browse/PARQUET-1160?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16590873#comment-16590873
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ASF GitHub Bot commented on PARQUET-1160:
-----------------------------------------
thaining opened a new pull request #495: PARQUET-1160: [C++] Implement
BYTE_ARRAY-backed Decimal reads
URL: https://github.com/apache/parquet-cpp/pull/495
This change enables support for DECIMALs backed by BYTE_ARRAYs
on disk. It does this by creating a TransferFunctor routine that
transforms a ByteArrayType to an ::arrow::Decimal128Type.
The routine does this by:
1. Creating an arrow::BinaryArray from the RecordReader's builder
2. Allocating a buffer for the arrow::Decimal128Array
3. Converting the big-endian bytes in each BinaryArray entry to two integers
representing the high and low bits of each decimal value.
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> [C++] Implement BYTE_ARRAY-backed Decimal reads
> -----------------------------------------------
>
> Key: PARQUET-1160
> URL: https://issues.apache.org/jira/browse/PARQUET-1160
> Project: Parquet
> Issue Type: Task
> Components: parquet-cpp
> Affects Versions: cpp-1.3.0
> Reporter: Phillip Cloud
> Assignee: Phillip Cloud
> Priority: Major
> Labels: pull-request-available
> Attachments: 20180726193815980.parquet
>
>
> These are valid in the parquet spec, but it seems like no system in use today
> implements a writer for this type.
> What systems support writing Decimals with this underlying type?
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