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Fix selecting columns from Parquet. #1486

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Jun 2, 2022
Merged

Fix selecting columns from Parquet. #1486

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4 changes: 3 additions & 1 deletion src/awkward/_v2/operations/ak_from_parquet.py
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Original file line number Diff line number Diff line change
Expand Up @@ -125,7 +125,7 @@ def _metadata(

if columns is not None:
list_indicator = "list.item"
for column_metadata in file_for_metadata.schema:
for column_metadata in parquetfile_for_metadata.schema:
if (
column_metadata.max_repetition_level > 0
and ".list.element." in column_metadata.path
Expand All @@ -138,6 +138,8 @@ def _metadata(
)
subform = form.select_columns(columns)
parquet_columns = subform.columns(list_indicator=list_indicator)
if parquetfile_for_metadata.schema_arrow.names == [""]:
parquet_columns = ["." + x for x in parquet_columns]

metadata = parquetfile_for_metadata.metadata
if row_groups is not None:
Expand Down