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BigQuery: Allow subset of schema to be passed into load_table_from_dataframe. #9064

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merged 9 commits into from
Aug 22, 2019
Merged

BigQuery: Allow subset of schema to be passed into load_table_from_dataframe. #9064

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aedca10
Allow subset of schema to be passed into `load_table_from_dataframe`.
tswast Aug 20, 2019
a580425
Use OrderedDict for brevity.
tswast Aug 21, 2019
105ebc9
Use OrderedDict for DataFrame in system tests.
tswast Aug 21, 2019
b8489fd
Warn when it's not possible to determine a column type.
tswast Aug 21, 2019
718c172
Refactor for coverage.
tswast Aug 21, 2019
8788441
Move struct type detection to _pandas_helpers
tswast Aug 21, 2019
1fa9389
Set schema to None if can't be autodetected.
tswast Aug 22, 2019
a94a95b
Merge remote-tracking branch 'upstream/master' into issue8140-partial…
tswast Aug 22, 2019
ca303a6
Explicitly use unicode strings in tests.
tswast Aug 22, 2019
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8 changes: 4 additions & 4 deletions bigquery/google/cloud/bigquery/_pandas_helpers.py
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Original file line number Diff line number Diff line change
Expand Up @@ -198,9 +198,9 @@ def dataframe_to_bq_schema(dataframe, bq_schema):
type for some or all of the DataFrame columns.

Returns:
Sequence[google.cloud.bigquery.schema.SchemaField]:
The automatically determined schema. Returns empty tuple if the
type of any column cannot be determined.
Optional[Sequence[google.cloud.bigquery.schema.SchemaField]]:
The automatically determined schema. Returns None if the type of
any column cannot be determined.
"""
if bq_schema:
for field in bq_schema:
Expand All @@ -227,7 +227,7 @@ def dataframe_to_bq_schema(dataframe, bq_schema):
bq_type = _PANDAS_DTYPE_TO_BQ.get(dtype.name)
if not bq_type:
warnings.warn("Unable to determine type of column '{}'.".format(column))
return ()
return None
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bq_field = schema.SchemaField(column, bq_type)
bq_schema_out.append(bq_field)
return tuple(bq_schema_out)
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