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Add improved typed casting to BigQuery #8331

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Merged
betodealmeida merged 1 commit into from
Oct 21, 2019
Merged

Add improved typed casting to BigQuery #8331

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21 changes: 21 additions & 0 deletions superset/db_engine_specs/bigquery.py
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Original file line number Diff line number Diff line change
Expand Up @@ -25,6 +25,21 @@
from superset.db_engine_specs.base import BaseEngineSpec


pandas_dtype_map = {
"STRING": "object",
"BOOLEAN": "bool",
"INTEGER": "Int64",
"FLOAT": "float64",
"TIMESTAMP": "datetime64[ns]",
"DATETIME": "datetime64[ns]",
"DATE": "object",
"BYTES": "object",
"TIME": "object",
"RECORD": "object",
"NUMERIC": "object",
}


class BigQueryEngineSpec(BaseEngineSpec):
"""Engine spec for Google's BigQuery

Expand Down Expand Up @@ -183,3 +198,9 @@ def df_to_sql(cls, df: pd.DataFrame, **kwargs):
if key in kwargs:
gbq_kwargs[key] = kwargs[key]
pandas_gbq.to_gbq(df, **gbq_kwargs)

@classmethod
def get_pandas_dtype(cls, cursor_description: List[tuple]) -> Dict[str, str]:
return {
col[0]: pandas_dtype_map.get(col[1], "object") for col in cursor_description
}