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https://issues.apache.org/jira/browse/ARROW-6921?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16954009#comment-16954009
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Wes McKinney commented on ARROW-6921:
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Thanks. We should be able to get that updated
> Regression: Cannot round-trip IPC files between PyArrow and Arrow JS
> ---------------------------------------------------------------------
>
> Key: ARROW-6921
> URL: https://issues.apache.org/jira/browse/ARROW-6921
> Project: Apache Arrow
> Issue Type: Bug
> Components: JavaScript, Python
> Affects Versions: 0.15.0, 0.15.1
> Environment: Broken PyArrow: conda-forge build 0.15.0-py37h8b68381_0
> Working PyArrow: conda-forge build 0.14.1-py37h8b68381_2
> Arrow JS versions tested: 0.13.0, 0.14.0 (apache-arrow@latest)
> OS: Tested on Win7, Amazon Linux AMI 2018.03
> Python platforms: Win7/Conda/Python 3.6, RHEL/Conda/Python 3.6
> JS platforms: Node 10.15.0, Chrome 77.0.3865.120
> Reporter: Joe Quigley
> Priority: Major
>
> Originally raised by [Sarath|https://stackoverflow.com/users/403133/sarath]
> on [StackOverflow|https://stackoverflow.com/questions/58313254], reporting
> here as I've run into this issue as well.
> When exporting an Arrow table using PyArrow, ArrowJS incorrectly imports it
> as a 0-row table, skipping any data in the table. The schema is imported
> correctly, including metadata, but the length of the table is 0.
> {code:python}
> import pyarrow as pa
> table = pa.Table.from_pydict( {"a": [1, 2, 3], "b": [4, 5, 6]} )
> with pa.RecordBatchFileWriter('file.arrow', table.schema) as writer:
> writer.write_table(table)
> {code}
> If {{file.arrow}} was generated with PyArrow 0.15, the following JS snippet
> will fail. However, if you generated it with PyArrow 0.14, then the JS
> snippet will work as expected:
> {code:javascript}
> const { readFileSync } = require("fs");
> const { Table } = require("apache-arrow");
> const data = readFileSync("file.arrow");
> const table = Table.from([ data ]);
> console.assert(table.length === 3, "Table should have 3 rows");
> console.assert(table.get(0) != null, "First row should not be null");
> {code}
> Tested with PyArrow 0.14.1, 0.15.0, and ArrowJS 0.13.0 and 0.14.1.
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