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https://issues.apache.org/jira/browse/ARROW-15790?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17500552#comment-17500552
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Joris Van den Bossche commented on ARROW-15790:
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Well, see ARROW-15548 for some discussion on why this is not yet supported (for
a start, we don't yet expose {{ColumnMetaData.key_value_metadata}}).
I am going to close this as a duplicate of ARROW-15548, we can continue the
discussion there.
> [C++] field's metadata is not written to Parquet file
> -----------------------------------------------------
>
> Key: ARROW-15790
> URL: https://issues.apache.org/jira/browse/ARROW-15790
> Project: Apache Arrow
> Issue Type: Bug
> Environment: Ubuntu
> Reporter: Sifang Li
> Priority: Blocker
>
> I used this code to test the metadata write into file and read back behavior
> of parquet file:
> [https://gist.github.com/dantrim/33f9f14d0b2d3ec45c022aa05f7a45ee]
>
> The generated file does not have metadata when I read the file in using code
> below and print it out:
>
> {quote}std::shared_ptr<arrow::io::ReadableFile> infile;
> PARQUET_ASSIGN_OR_THROW(infile,
> arrow::io::ReadableFile::Open("./test.parquet",
> arrow::default_memory_pool()));
> std::unique_ptr<parquet::arrow::FileReader> reader;
> PARQUET_THROW_NOT_OK(
> parquet::arrow::OpenFile(infile, arrow::default_memory_pool(), &reader));
> std::shared_ptr<arrow::Table> table;
> PARQUET_THROW_NOT_OK(reader->ReadTable(&table));
> EXPECT_EQ(frameCount, table->num_rows());
> std::cout<<"==="<<table->schema()->ToString(true) <<std::endl; /// no meta
> shown{quote}
> Here is the version info:
> libparquet-dev/focal,now 7.0.0-1 amd64 [installed]
> libparquet-glib-dev/focal,now 7.0.0-1 amd64 [installed]
> libparquet-glib700/focal,now 7.0.0-1 amd64 [installed,automatic]
> libparquet700/focal,now 7.0.0-1 amd64 [installed,automatic]
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