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fix: deprecate SQL column caching #1

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merged 2 commits into from
Mar 31, 2024
Merged

fix: deprecate SQL column caching #1

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a88701f
deprecate column caching
raulbonet Mar 30, 2024
5e0e780
[pre-commit.ci] auto fixes from pre-commit.com hooks
pre-commit-ci[bot] Mar 30, 2024
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42 changes: 17 additions & 25 deletions singer_sdk/connectors/sql.py
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Original file line number Diff line number Diff line change
Expand Up @@ -58,8 +58,6 @@ def __init__(
"""
self._config: dict[str, t.Any] = config or {}
self._sqlalchemy_url: str | None = sqlalchemy_url or None
self._table_cols_cache: dict[str, dict[str, sa.Column]] = {}
self._schema_cache: set[str] = set()

@property
def config(self) -> dict:
Expand Down Expand Up @@ -586,12 +584,8 @@ def schema_exists(self, schema_name: str) -> bool:
Returns:
True if the database schema exists, False if not.
"""
if schema_name not in self._schema_cache:
self._schema_cache = set(
sa.inspect(self._engine).get_schema_names(),
)

return schema_name in self._schema_cache
schemas = set(sa.inspect(self._engine).get_schema_names())
return schema_name in schemas

def get_table_columns(
self,
Expand All @@ -607,24 +601,22 @@ def get_table_columns(
Returns:
An ordered list of column objects.
"""
if full_table_name not in self._table_cols_cache:
_, schema_name, table_name = self.parse_full_table_name(full_table_name)
inspector = sa.inspect(self._engine)
columns = inspector.get_columns(table_name, schema_name)

self._table_cols_cache[full_table_name] = {
col_meta["name"]: sa.Column(
col_meta["name"],
col_meta["type"],
nullable=col_meta.get("nullable", False),
)
for col_meta in columns
if not column_names
or col_meta["name"].casefold()
in {col.casefold() for col in column_names}
}
_, schema_name, table_name = self.parse_full_table_name(full_table_name)
inspector = sa.inspect(self._engine)
columns = inspector.get_columns(table_name, schema_name)

columns_dict: dict[str, sa.Column] = {
col_meta["name"]: sa.Column(
col_meta["name"],
col_meta["type"],
nullable=col_meta.get("nullable", False),
)
for col_meta in columns
if not column_names
or col_meta["name"].casefold() in {col.casefold() for col in column_names}
}

return self._table_cols_cache[full_table_name]
return columns_dict

def get_table(
self,
Expand Down