Bases: SqlIdentifierMixin
Mixin that provides common BigQuery helpers (identifier quoting, dataset creation).
Expect subclasses to define: self.project, self.dataset, self.client.
Source code in src/fastflowtransform/executors/bigquery/_bigquery_mixin.py
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69 | class BigQueryIdentifierMixin(SqlIdentifierMixin):
"""
Mixin that provides common BigQuery helpers (identifier quoting, dataset creation).
Expect subclasses to define: self.project, self.dataset, self.client.
"""
project: str
dataset: str
client: bigquery.Client
def _bq_quote(self, value: str) -> str:
return value.replace("`", "\\`")
def _quote_identifier(self, ident: str) -> str:
return self._bq_quote(ident)
def _default_schema(self) -> str | None:
return self.dataset
def _default_catalog(self) -> str | None:
return self.project
def _should_include_catalog(
self, catalog: str | None, schema: str | None, *, explicit: bool
) -> bool:
# BigQuery always expects a project + dataset.
return True
def _qualify_identifier(
self,
ident: str,
*,
schema: str | None = None,
catalog: str | None = None,
quote: bool = True,
) -> str:
proj = self._clean_part(catalog) or self._default_catalog()
dset = self._clean_part(schema) or self._default_schema()
normalized = self._normalize_identifier(ident)
parts = [proj, dset, normalized]
if not quote:
return ".".join(p for p in parts if p)
return f"`{'.'.join(self._bq_quote(p) for p in parts if p)}`"
def _qualified_identifier(
self, relation: str, project: str | None = None, dataset: str | None = None
) -> str:
return self._qualify_identifier(relation, schema=dataset, catalog=project)
def _ensure_dataset(self) -> None:
ds_id = f"{self.project}.{self.dataset}"
try:
self.client.get_dataset(ds_id)
return
except NotFound:
if not getattr(self, "allow_create_dataset", False):
raise
ds_obj = bigquery.Dataset(ds_id)
if getattr(self, "location", None):
ds_obj.location = self.location # type: ignore[attr-defined]
self.client.create_dataset(ds_obj, exists_ok=True)
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