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Include column compression details in inspect output #25

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merged 2 commits into from
Jun 8, 2022
Merged

Include column compression details in inspect output #25

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ab34c90
Include column compression details in inspect output
mrdavidlaing Jun 2, 2022
8095932
Add expected compression output to inspect tests
Jun 5, 2022
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8 changes: 6 additions & 2 deletions parquet_tools/commands/inspect.py
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Original file line number Diff line number Diff line change
Expand Up @@ -58,7 +58,7 @@ def _execute_simple(filename: str) -> None:
file_meta: pq.FileMetaData = pq_file.metadata
print(_simple_meta_expression(file_meta))
file_schema: pq.ParquetSchema = pq_file.schema
print(_simple_schema_expression(file_schema))
print(_simple_schema_expression(file_meta, file_schema))


def _simple_meta_expression(file_meta: pq.FileMetaData) -> str:
Expand All @@ -73,7 +73,7 @@ def _simple_meta_expression(file_meta: pq.FileMetaData) -> str:
''')


def _simple_schema_expression(schema) -> str:
def _simple_schema_expression(file_meta, schema) -> str:
columns: List[str] = schema.names
columns_exp = '\n'.join(columns)

Expand All @@ -83,6 +83,9 @@ def _simple_schema_expression(schema) -> str:
''')
for i, column in enumerate(columns):
col = schema.column(i)
col_meta = file_meta.row_group(0).column(i)
col_compression_space_saving_ratio = 1 - (col_meta.total_compressed_size / col_meta.total_uncompressed_size)
col_compression = f"{col_meta.compression} (space_saved: {col_compression_space_saving_ratio*100:.0f}%)"
exp += dedent(f'''
############ Column({column}) ############
name: {col.name}
Expand All @@ -92,6 +95,7 @@ def _simple_schema_expression(schema) -> str:
physical_type: {col.physical_type}
logical_type: {col.logical_type}
converted_type (legacy): {col.converted_type}
compression: {col_compression}
''')

return exp
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3 changes: 3 additions & 0 deletions tests/test_inspect.py
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Original file line number Diff line number Diff line change
Expand Up @@ -57,6 +57,7 @@ def test_excute_simple(capfd, parquet_file):
physical_type: DOUBLE
logical_type: None
converted_type (legacy): NONE
compression: SNAPPY (space_saved: -4%)

############ Column(two) ############
name: two
Expand All @@ -66,6 +67,7 @@ def test_excute_simple(capfd, parquet_file):
physical_type: BYTE_ARRAY
logical_type: String
converted_type (legacy): UTF8
compression: SNAPPY (space_saved: -5%)

############ Column(three) ############
name: three
Expand All @@ -75,5 +77,6 @@ def test_excute_simple(capfd, parquet_file):
physical_type: BOOLEAN
logical_type: None
converted_type (legacy): NONE
compression: SNAPPY (space_saved: -5%)

'''