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impl.py
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impl.py
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from dataclasses import dataclass
from typing import Mapping, Any, Optional, List, Union, Dict
import agate
from dbt.adapters.base.impl import AdapterConfig, ConstraintSupport # type: ignore
from dbt.adapters.base.meta import available
from dbt.adapters.capability import CapabilityDict, CapabilitySupport, Support, Capability
from dbt.adapters.sql import SQLAdapter # type: ignore
from dbt.adapters.sql.impl import (
LIST_SCHEMAS_MACRO_NAME,
LIST_RELATIONS_MACRO_NAME,
)
from dbt.adapters.snowflake import SnowflakeConnectionManager
from dbt.adapters.snowflake import SnowflakeRelation
from dbt.adapters.snowflake import SnowflakeColumn
from dbt.contracts.graph.manifest import Manifest
from dbt.contracts.graph.nodes import ConstraintType
from dbt.exceptions import CompilationError, DbtDatabaseError, DbtRuntimeError
from dbt.utils import filter_null_values
@dataclass
class SnowflakeConfig(AdapterConfig):
transient: Optional[bool] = None
cluster_by: Optional[Union[str, List[str]]] = None
automatic_clustering: Optional[bool] = None
secure: Optional[bool] = None
copy_grants: Optional[bool] = None
snowflake_warehouse: Optional[str] = None
query_tag: Optional[str] = None
tmp_relation_type: Optional[str] = None
merge_update_columns: Optional[str] = None
target_lag: Optional[str] = None
class SnowflakeAdapter(SQLAdapter):
Relation = SnowflakeRelation
Column = SnowflakeColumn
ConnectionManager = SnowflakeConnectionManager
AdapterSpecificConfigs = SnowflakeConfig
CONSTRAINT_SUPPORT = {
ConstraintType.check: ConstraintSupport.NOT_SUPPORTED,
ConstraintType.not_null: ConstraintSupport.ENFORCED,
ConstraintType.unique: ConstraintSupport.NOT_ENFORCED,
ConstraintType.primary_key: ConstraintSupport.NOT_ENFORCED,
ConstraintType.foreign_key: ConstraintSupport.NOT_ENFORCED,
}
_capabilities: CapabilityDict = CapabilityDict(
{
Capability.SchemaMetadataByRelations: CapabilitySupport(support=Support.Full),
Capability.TableLastModifiedMetadata: CapabilitySupport(support=Support.Full),
}
)
@classmethod
def date_function(cls):
return "CURRENT_TIMESTAMP()"
@classmethod
def _catalog_filter_table(cls, table: agate.Table, manifest: Manifest) -> agate.Table:
# On snowflake, users can set QUOTED_IDENTIFIERS_IGNORE_CASE, so force
# the column names to their lowercased forms.
lowered = table.rename(column_names=[c.lower() for c in table.column_names])
return super()._catalog_filter_table(lowered, manifest)
def _make_match_kwargs(self, database, schema, identifier):
quoting = self.config.quoting
if identifier is not None and quoting["identifier"] is False:
identifier = identifier.upper()
if schema is not None and quoting["schema"] is False:
schema = schema.upper()
if database is not None and quoting["database"] is False:
database = database.upper()
return filter_null_values(
{"identifier": identifier, "schema": schema, "database": database}
)
def _get_warehouse(self) -> str:
_, table = self.execute("select current_warehouse() as warehouse", fetch=True)
if len(table) == 0 or len(table[0]) == 0:
# can this happen?
raise DbtRuntimeError("Could not get current warehouse: no results")
return str(table[0][0])
def _use_warehouse(self, warehouse: str):
"""Use the given warehouse. Quotes are never applied."""
self.execute("use warehouse {}".format(warehouse))
def pre_model_hook(self, config: Mapping[str, Any]) -> Optional[str]:
default_warehouse = self.config.credentials.warehouse
warehouse = config.get("snowflake_warehouse", default_warehouse)
if warehouse == default_warehouse or warehouse is None:
return None
previous = self._get_warehouse()
self._use_warehouse(warehouse)
return previous
def post_model_hook(self, config: Mapping[str, Any], context: Optional[str]) -> None:
if context is not None:
self._use_warehouse(context)
def list_schemas(self, database: str) -> List[str]:
try:
results = self.execute_macro(LIST_SCHEMAS_MACRO_NAME, kwargs={"database": database})
except DbtDatabaseError as exc:
msg = f"Database error while listing schemas in database " f'"{database}"\n{exc}'
raise DbtRuntimeError(msg)
# this uses 'show terse schemas in database', and the column name we
# want is 'name'
return [row["name"] for row in results]
def get_columns_in_relation(self, relation):
try:
return super().get_columns_in_relation(relation)
except DbtDatabaseError as exc:
if "does not exist or not authorized" in str(exc):
return []
else:
raise
def list_relations_without_caching(self, schema_relation: SnowflakeRelation) -> List[SnowflakeRelation]: # type: ignore
kwargs = {"schema_relation": schema_relation}
try:
results = self.execute_macro(LIST_RELATIONS_MACRO_NAME, kwargs=kwargs)
except DbtDatabaseError as exc:
# if the schema doesn't exist, we just want to return.
# Alternatively, we could query the list of schemas before we start
# and skip listing the missing ones, which sounds expensive.
if "Object does not exist" in str(exc):
return []
raise
relations = []
quote_policy = {"database": True, "schema": True, "identifier": True}
columns = ["database_name", "schema_name", "name", "kind"]
for _database, _schema, _identifier, _type in results.select(columns): # type: ignore
try:
_type = self.Relation.get_relation_type(_type.lower())
except ValueError:
_type = self.Relation.External
relations.append(
self.Relation.create(
database=_database,
schema=_schema,
identifier=_identifier,
quote_policy=quote_policy,
type=_type,
)
)
return relations
def quote_seed_column(self, column: str, quote_config: Optional[bool]) -> str:
quote_columns: bool = False
if isinstance(quote_config, bool):
quote_columns = quote_config
elif quote_config is None:
pass
else:
msg = (
f'The seed configuration value of "quote_columns" has an '
f"invalid type {type(quote_config)}"
)
raise CompilationError(msg)
if quote_columns:
return self.quote(column)
else:
return column
@available
def standardize_grants_dict(self, grants_table: agate.Table) -> dict:
grants_dict: Dict[str, Any] = {}
for row in grants_table:
grantee = row["grantee_name"]
granted_to = row["granted_to"]
privilege = row["privilege"]
if privilege != "OWNERSHIP" and granted_to != "SHARE":
if privilege in grants_dict.keys():
grants_dict[privilege].append(grantee)
else:
grants_dict.update({privilege: [grantee]})
return grants_dict
def timestamp_add_sql(self, add_to: str, number: int = 1, interval: str = "hour") -> str:
return f"DATEADD({interval}, {number}, {add_to})"
def submit_python_job(self, parsed_model: dict, compiled_code: str):
schema = parsed_model["schema"]
database = parsed_model["database"]
identifier = parsed_model["alias"]
python_version = parsed_model["config"].get("python_version", "3.8")
packages = parsed_model["config"].get("packages", [])
imports = parsed_model["config"].get("imports", [])
# adding default packages we need to make python model work
default_packages = ["snowflake-snowpark-python"]
package_names = [package.split("==")[0] for package in packages]
for default_package in default_packages:
if default_package not in package_names:
packages.append(default_package)
packages = "', '".join(packages)
imports = "', '".join(imports)
# we can't pass empty imports clause to snowflake
if imports:
imports = f"IMPORTS = ('{imports}')"
snowpark_telemetry_string = "dbtLabs_dbtPython"
snowpark_telemetry_snippet = f"""
import sys
sys._xoptions['snowflake_partner_attribution'].append("{snowpark_telemetry_string}")"""
common_procedure_code = f"""
RETURNS STRING
LANGUAGE PYTHON
RUNTIME_VERSION = '{python_version}'
PACKAGES = ('{packages}')
{imports}
HANDLER = 'main'
EXECUTE AS CALLER
AS
$$
{snowpark_telemetry_snippet}
{compiled_code}
$$"""
use_anonymous_sproc = parsed_model["config"].get("use_anonymous_sproc", True)
if use_anonymous_sproc:
proc_name = f"{identifier}__dbt_sp"
python_stored_procedure = f"""
WITH {proc_name} AS PROCEDURE ()
{common_procedure_code}
CALL {proc_name}();
"""
else:
proc_name = f"{database}.{schema}.{identifier}__dbt_sp"
python_stored_procedure = f"""
CREATE OR REPLACE PROCEDURE {proc_name} ()
{common_procedure_code};
CALL {proc_name}();
"""
response, _ = self.execute(python_stored_procedure, auto_begin=False, fetch=False)
if not use_anonymous_sproc:
self.execute(
f"drop procedure if exists {proc_name}()",
auto_begin=False,
fetch=False,
)
return response
def valid_incremental_strategies(self):
return ["append", "merge", "delete+insert"]
def debug_query(self):
"""Override for DebugTask method"""
self.execute("select 1 as id")