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https://issues.apache.org/jira/browse/ARROW-8142?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Joris Van den Bossche updated ARROW-8142:
-----------------------------------------
Fix Version/s: 0.17.0
> [Python/C++] Casting empty table from after parquet roundtrip causes critical
> failure
> -------------------------------------------------------------------------------------
>
> Key: ARROW-8142
> URL: https://issues.apache.org/jira/browse/ARROW-8142
> Project: Apache Arrow
> Issue Type: Bug
> Reporter: Florian Jetter
> Priority: Major
> Fix For: 0.17.0
>
>
> When casting a schema of an empty table from dict encoded to non-dict encoded
> type a critical error is raised and not handled causing the interpreter to
> shut down.
> This only happens after a parquet roundtrip
>
> {code:python}
> import pyarrow as pa
> import pandas as pd
> import pyarrow.parquet as pq
> df = pd.DataFrame({"col": ["a"]}).astype({"col": "category"}).iloc[:0]
> table = pa.Table.from_pandas(df)
> field = table.schema[0]
> new_field = pa.field(field.name, field.type.value_type, field.nullable,
> field.metadata)
> buf = pa.BufferOutputStream()
> pq.write_table(table, buf)
> reader = pa.BufferReader(buf.getvalue().to_pybytes())
> table = pq.read_table(reader)
> schema = table.schema.remove(0).insert(0, new_field)
> new_table = table.cast(schema)
> assert new_table.schema == schema
> {code}
>
> Output
> {code:java}
> WARNING: Logging before InitGoogleLogging() is written to STDERR
> F0318 09:55:14.266649 299722176 table.cc:47] Check failed: (chunks.size()) >
> (0) cannot construct ChunkedArray from empty vector and omitted type {code}
>
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