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fix: Fix reading of chunked parquet when columns parameter is spec… #2598

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fix: Fix reading of chunked parquet when columns parameter is spec… #2598

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bugfix: Fix reading of chunked parquet when columns parameter is spec…
rchromik Jan 10, 2024
1ddc58c
Merge branch 'main' into bugfix/chunked_read_parquet_fix_columns_param
rchromik Jan 10, 2024
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9 changes: 8 additions & 1 deletion awswrangler/s3/_read_parquet.py
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Original file line number Diff line number Diff line change
Expand Up @@ -237,8 +237,15 @@ def _read_parquet_chunked(
chunks = pq_file.iter_batches(
batch_size=batch_size, columns=columns, use_threads=use_threads_flag, use_pandas_metadata=False
)

if columns is not None:
field_dict = {field.name: field for field in pq_file.schema.to_arrow_schema()}
schema = pa.schema([field_dict[column] for column in columns])
else:
schema = pq_file.schema.to_arrow_schema()

table = _add_table_partitions(
table=pa.Table.from_batches(chunks, schema=pq_file.schema.to_arrow_schema()),
table=pa.Table.from_batches(chunks, schema=schema),
path=path,
path_root=path_root,
)
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