[
https://issues.apache.org/jira/browse/ARROW-2242?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Chris Ellison updated ARROW-2242:
---------------------------------
Description:
When reading a parquet file with binary data > 2 GiB, we get an ArrowIOError
due to it not creating chunked arrays. Reading each row group individually and
then concatenating the tables works, however.
{code:java}
import pandas as pd
import pyarrow as pa
import pyarrow.parquet as pq
x = pa.array(list('1' * 2**30))
demo = 'demo.parquet'
def scenario():
t = pa.Table.from_arrays([x], ['x'])
writer = pq.ParquetWriter(demo, t.schema)
for i in range(2):
writer.write_table(t)
writer.close()
pf = pq.ParquetFile(demo)
# pyarrow.lib.ArrowIOError: Arrow error: Invalid: BinaryArray cannot
contain more than 2147483646 bytes, have 2147483647
t2 = pf.read()
# Works, but note, there are 32 row groups, not 2 as suggested by:
#
https://arrow.apache.org/docs/python/parquet.html#finer-grained-reading-and-writing
tables = [pf.read_row_group(i) for i in range(pf.num_row_groups)]
t3 = pa.concat_tables(tables)
scenario()
{code}
was:
When reading a parquet file with binary data > 2 GiB, we get an ArrowIOError
due to it not creating chunked arrays. Reading each row group individually and
then concatenating the tables works, however.
{code:java}
import pandas as pd
import pyarrow as pa
import pyarrow.parquet as pq
x = pa.array(list('1' * 2**30))
demo = 'demo.parquet'
def scenario():
t = pa.Table.from_arrays([x], ['x'])
writer = pq.ParquetWriter(demo, t.schema)
for i in range(2):
writer.write_table(t)
writer.close()
pf = pq.ParquetFile(demo)
# pyarrow.lib.ArrowIOError: Arrow error: Invalid: BinaryArray cannot
contain more than 2147483646 bytes, have 2147483647
t2 = pf.read()
# Works, but note, there are 32 row groups, not 2 as suggested by:
#
https://arrow.apache.org/docs/python/parquet.html#finer-grained-reading-and-writing
#tables = [pf.read_row_group(i) for i in range(pf.num_row_groups)]
#t3 = pa.concat_tables(tables)
scenario()
{code}
> [Python] ParquetFile.read does not accommodate large binary data
> -----------------------------------------------------------------
>
> Key: ARROW-2242
> URL: https://issues.apache.org/jira/browse/ARROW-2242
> Project: Apache Arrow
> Issue Type: Bug
> Components: Python
> Affects Versions: 0.8.0
> Reporter: Chris Ellison
> Priority: Major
> Fix For: 0.9.0
>
>
> When reading a parquet file with binary data > 2 GiB, we get an ArrowIOError
> due to it not creating chunked arrays. Reading each row group individually
> and then concatenating the tables works, however.
>
> {code:java}
> import pandas as pd
> import pyarrow as pa
> import pyarrow.parquet as pq
> x = pa.array(list('1' * 2**30))
> demo = 'demo.parquet'
> def scenario():
> t = pa.Table.from_arrays([x], ['x'])
> writer = pq.ParquetWriter(demo, t.schema)
> for i in range(2):
> writer.write_table(t)
> writer.close()
> pf = pq.ParquetFile(demo)
> # pyarrow.lib.ArrowIOError: Arrow error: Invalid: BinaryArray cannot
> contain more than 2147483646 bytes, have 2147483647
> t2 = pf.read()
> # Works, but note, there are 32 row groups, not 2 as suggested by:
> #
> https://arrow.apache.org/docs/python/parquet.html#finer-grained-reading-and-writing
> tables = [pf.read_row_group(i) for i in range(pf.num_row_groups)]
> t3 = pa.concat_tables(tables)
> scenario()
> {code}
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