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121 | class SqlIdentifierMixin:
"""
Thin helper mixin for engines that qualify SQL identifiers with optional
catalog/database and schema.
Subclasses must implement `_quote_identifier` and may override the
*_default_* / *_should_include_catalog methods to match engine quirks.
"""
def _normalize_identifier(self, ident: str) -> str:
"""
Normalize fastflowtransform's logical identifiers:
- Strip `.ff` suffixes via relation_for
- Leave other strings untouched
"""
if not isinstance(ident, str):
return ident
return relation_for(ident) if ident.endswith(".ff") else ident
def _clean_part(self, part: Any) -> str | None:
if not isinstance(part, str):
return None
stripped = part.strip()
return stripped or None
def _quote_identifier(self, ident: str) -> str: # pragma: no cover - abstract
"""Engine-specific quoting (e.g., \"name\" or `name`)."""
raise NotImplementedError
def _default_schema(self) -> str | None:
return self._clean_part(getattr(self, "schema", None))
def _default_catalog(self) -> str | None:
return self._clean_part(getattr(self, "catalog", None))
def _default_catalog_for_source(self, schema: str | None) -> str | None:
"""Hook to adjust catalog fallback for sources (override per engine)."""
return self._default_catalog()
def _should_include_catalog(
self, catalog: str | None, schema: str | None, *, explicit: bool
) -> bool:
"""
Decide whether to emit the catalog in a qualified identifier.
explicit=True when the caller passed a catalog argument (as opposed to
using defaults), so engines can honour explicit catalogs even if they
normally omit them.
"""
return bool(catalog)
def _qualify_identifier(
self,
ident: str,
*,
schema: str | None = None,
catalog: str | None = None,
quote: bool = True,
) -> str:
"""
Assemble a qualified identifier (catalog.schema.ident) with engine
defaults and quoting.
"""
normalized = self._normalize_identifier(ident)
explicit_catalog = catalog is not None
sch = self._clean_part(schema) or self._default_schema()
cat = self._clean_part(catalog) if explicit_catalog else self._default_catalog()
parts: list[str] = []
if self._should_include_catalog(cat, sch, explicit=explicit_catalog) and cat:
parts.append(cat)
if sch:
parts.append(sch)
parts.append(normalized)
if not quote:
return ".".join(parts)
return ".".join(self._quote_identifier(p) for p in parts)
# ---- Shared formatting hooks -----------------------------------------
def _format_relation_for_ref(self, name: str) -> str:
return self._qualify_identifier(relation_for(name))
def _pick_schema(self, cfg: dict[str, Any]) -> str | None:
for key in ("schema", "dataset"):
candidate = self._clean_part(cfg.get(key))
if candidate:
return candidate
return self._default_schema()
def _pick_catalog(self, cfg: dict[str, Any], schema: str | None) -> str | None:
for key in ("catalog", "database", "project"):
candidate = self._clean_part(cfg.get(key))
if candidate:
return candidate
return self._default_catalog_for_source(schema)
def _format_source_reference(
self, cfg: dict[str, Any], source_name: str, table_name: str
) -> str:
if cfg.get("location"):
raise NotImplementedError(
f"{getattr(self, 'engine_name', 'unknown')} executor "
"does not support path-based sources."
)
ident = cfg.get("identifier")
if not ident:
raise KeyError(f"Source {source_name}.{table_name} missing identifier")
schema = self._pick_schema(cfg)
catalog = self._pick_catalog(cfg, schema)
return self._qualify_identifier(ident, schema=schema, catalog=catalog)
|