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feat(explore): Postgres datatype conversion #13294

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merged 36 commits into from
Mar 12, 2021
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feat(explore): Postgres datatype conversion #13294

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70572c8
test
nikolagigic Feb 23, 2021
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unnecessary import
nikolagigic Feb 23, 2021
83f3996
fix lint
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fix lint
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nikolagigic Feb 26, 2021
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Merge branch 'master' into postgres_type_conversion
nikolagigic Feb 26, 2021
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changes
nikolagigic Mar 2, 2021
4b8d0ec
answering comments & changes
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fix tests
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Merge branch 'master' into postgres_type_conversion
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fix tests
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Merge branch 'master' into postgres_type_conversion
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fix tests
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45 changes: 34 additions & 11 deletions superset/db_engine_specs/base.py
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Original file line number Diff line number Diff line change
Expand Up @@ -41,7 +41,7 @@
import sqlparse
from flask import g
from flask_babel import lazy_gettext as _
from sqlalchemy import column, DateTime, select
from sqlalchemy import column, DateTime, select, types
from sqlalchemy.engine.base import Engine
from sqlalchemy.engine.interfaces import Compiled, Dialect
from sqlalchemy.engine.reflection import Inspector
Expand All @@ -57,6 +57,7 @@
from superset.models.sql_lab import Query
from superset.sql_parse import ParsedQuery, Table
from superset.utils import core as utils
from superset.utils.core import ColumnSpec

if TYPE_CHECKING:
# prevent circular imports
Expand Down Expand Up @@ -145,7 +146,12 @@ class BaseEngineSpec: # pylint: disable=too-many-public-methods
_date_trunc_functions: Dict[str, str] = {}
_time_grain_expressions: Dict[Optional[str], str] = {}
column_type_mappings: Tuple[
Tuple[Pattern[str], Union[TypeEngine, Callable[[Match[str]], TypeEngine]]], ...,
Tuple[
Pattern[str],
Union[TypeEngine, Callable[[Match[str]], TypeEngine]],
utils.GenericDataType,
],
...,
] = ()
time_groupby_inline = False
limit_method = LimitMethod.FORCE_LIMIT
Expand Down Expand Up @@ -967,25 +973,27 @@ def make_label_compatible(cls, label: str) -> Union[str, quoted_name]:
return label_mutated

@classmethod
def get_sqla_column_type(cls, type_: Optional[str]) -> Optional[TypeEngine]:
def get_sqla_column_type(
cls, column_type: Optional[str]
) -> Tuple[Union[TypeEngine, utils.GenericDataType, None]]:
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I would consider just leaving the signature of this method unchanged for now; otherwise I'd just remove this one and start using the new get_column_spec method and implement that wherever get_sqla_column_type is being used, as that's the end state we want to aim for.

"""
Return a sqlalchemy native column type that corresponds to the column type
defined in the data source (return None to use default type inferred by
SQLAlchemy). Override `column_type_mappings` for specific needs
(see MSSQL for example of NCHAR/NVARCHAR handling).

:param type_: Column type returned by inspector
:param column_type: Column type returned by inspector
:return: SqlAlchemy column type
"""
if not type_:
return None
for regex, sqla_type in cls.column_type_mappings:
match = regex.match(type_)
if not column_type:
return None, None
for regex, sqla_type, generic_type in cls.column_type_mappings:
match = regex.match(column_type)
if match:
if callable(sqla_type):
return sqla_type(match)
return sqla_type
return None
return sqla_type(match), generic_type
return sqla_type, generic_type
return None, None
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For cases where we want to return an empty value (=no match was made), I'd perhaps prefer returning a pure None instead of a Tuple with Nones.


@staticmethod
def _mutate_label(label: str) -> str:
Expand Down Expand Up @@ -1097,3 +1105,18 @@ def get_extra_params(database: "Database") -> Dict[str, Any]:
def is_readonly_query(cls, parsed_query: ParsedQuery) -> bool:
"""Pessimistic readonly, 100% sure statement won't mutate anything"""
return parsed_query.is_select() or parsed_query.is_explain()

def get_column_spec(
self,
native_type: str,
source: utils.ColumnTypeSource = utils.ColumnTypeSource.GET_TABLE,
) -> utils.ColumnSpec:

column_type, generic_type = self.get_sqla_column_type(native_type)
is_dttm = generic_type == utils.GenericDataType.TEMPORAL

column_spec = ColumnSpec(
sqla_type=column_type, generic_type=generic_type, is_dttm=is_dttm
)

return column_spec
12 changes: 10 additions & 2 deletions superset/db_engine_specs/mssql.py
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Original file line number Diff line number Diff line change
Expand Up @@ -78,8 +78,16 @@ def fetch_data(
return cls.pyodbc_rows_to_tuples(data)

column_type_mappings = (
(re.compile(r"^N((VAR)?CHAR|TEXT)", re.IGNORECASE), UnicodeText()),
(re.compile(r"^((VAR)?CHAR|TEXT|STRING)", re.IGNORECASE), String()),
(
re.compile(r"^N((VAR)?CHAR|TEXT)", re.IGNORECASE),
UnicodeText(),
utils.GenericDataType.STRING,
),
(
re.compile(r"^((VAR)?CHAR|TEXT|STRING)", re.IGNORECASE),
String(),
utils.GenericDataType.STRING,
),
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I would probably design this so that an engine spec can extend the base mapping. In the case of MSSQL, I believe the base mapping is a good fallback. Also, we might consider incorporating these types into the base spec, as I assume fairly many engines support N-prefixed character types, and some of those engines might also benefit from the UnicodeText SQLA type over the regular String one.

)

@classmethod
Expand Down
92 changes: 92 additions & 0 deletions superset/db_engine_specs/postgres.py
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Original file line number Diff line number Diff line change
Expand Up @@ -21,6 +21,8 @@
from typing import Any, Dict, List, Optional, Tuple, TYPE_CHECKING

from pytz import _FixedOffset # type: ignore
from sqlalchemy import types
from sqlalchemy.dialects.postgresql import DOUBLE_PRECISION
from sqlalchemy.dialects.postgresql.base import PGInspector

from superset.db_engine_specs.base import BaseEngineSpec
Expand All @@ -45,6 +47,96 @@ class PostgresBaseEngineSpec(BaseEngineSpec):
engine = ""
engine_name = "PostgreSQL"

column_type_mappings = (
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Would it make sense to consolidate the structure of db_column_types and column_type_mappings as they are basically doing very similar things (one to convert db column type to generic types; one to convert to SQLA types)?

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Yes - this is the ultimate objective. However, we want to leave the existing structures untouched until we're certain this doesn't break existing functionality. We'll be including other types in this mapping that are missing in db_column_types, like DbColumnType, PyArrow types etc to make sure this is a one-stop-shop for making available all necessary types in one place.

(
re.compile(r"^smallint", re.IGNORECASE),
types.SMALLINT,
utils.GenericDataType.NUMERIC,
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Nit: can we import GenericDataType directly and get rid of the utils. prefix? Just want the code the look cleaner.

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But, is adding GenericDataType here really necessary, though? I'd imagine all SQLA types could be definitively mapped to a GenericDataType, wouldn't they? Maybe ColumnSpec can just have an instance @property to map all known SQLA types to GenericDataType?

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@ktmud Yes, it could've been mapped as you proposed. The reason behind the current way is that if we get multiple matches we can prioritise those at the start of the list without necessarily sorting the results for the most part.

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I understand the need to use a list to have priority for RegExp matching, but will there be a case where two SQLA types may be matched to different GenericDataType? If not, isn't GenericDataType already inferred by SQLA types?

),
(
re.compile(r"^integer", re.IGNORECASE),
types.INTEGER,
utils.GenericDataType.NUMERIC,
),
(
re.compile(r"^bigint", re.IGNORECASE),
types.BIGINT,
utils.GenericDataType.NUMERIC,
),
(
re.compile(r"^decimal", re.IGNORECASE),
types.DECIMAL,
utils.GenericDataType.NUMERIC,
),
(
re.compile(r"^numeric", re.IGNORECASE),
types.NUMERIC,
utils.GenericDataType.NUMERIC,
),
(
re.compile(r"^real", re.IGNORECASE),
types.REAL,
utils.GenericDataType.NUMERIC,
),
(
re.compile(r"^double precision", re.IGNORECASE),
DOUBLE_PRECISION,
utils.GenericDataType.NUMERIC,
),
(
re.compile(r"^smallserial", re.IGNORECASE),
types.SMALLINT,
utils.GenericDataType.NUMERIC,
),
(
re.compile(r"^serial", re.IGNORECASE),
types.INTEGER,
utils.GenericDataType.NUMERIC,
),
(
re.compile(r"^bigserial", re.IGNORECASE),
types.BIGINT,
utils.GenericDataType.NUMERIC,
),
(
re.compile(r"^varchar", re.IGNORECASE),
types.VARCHAR,
utils.GenericDataType.STRING,
),
(re.compile(r"^char", re.IGNORECASE), types.CHAR, utils.GenericDataType.STRING),
(re.compile(r"^text", re.IGNORECASE), types.TEXT, utils.GenericDataType.STRING),
(
re.compile(r"^date", re.IGNORECASE),
types.DATE,
utils.GenericDataType.TEMPORAL,
),
(
re.compile(r"^time", re.IGNORECASE),
types.TIME,
utils.GenericDataType.TEMPORAL,
),
(
re.compile(r"^timestamp", re.IGNORECASE),
types.TIMESTAMP,
utils.GenericDataType.TEMPORAL,
),
(
re.compile(r"^timestamptz", re.IGNORECASE),
types.TIMESTAMP(timezone=True),
utils.GenericDataType.TEMPORAL,
),
(
re.compile(r"^interval", re.IGNORECASE),
types.Interval,
utils.GenericDataType.TEMPORAL,
),
(
re.compile(r"^boolean", re.IGNORECASE),
types.BOOLEAN,
utils.GenericDataType.BOOLEAN,
),
)

_time_grain_expressions = {
None: "{col}",
"PT1S": "DATE_TRUNC('second', {col})",
Expand Down
92 changes: 75 additions & 17 deletions superset/db_engine_specs/presto.py
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Original file line number Diff line number Diff line change
Expand Up @@ -356,31 +356,89 @@ def _show_columns(
return columns

column_type_mappings = (
(re.compile(r"^boolean.*", re.IGNORECASE), types.Boolean()),
(re.compile(r"^tinyint.*", re.IGNORECASE), TinyInteger()),
(re.compile(r"^smallint.*", re.IGNORECASE), types.SmallInteger()),
(re.compile(r"^integer.*", re.IGNORECASE), types.Integer()),
(re.compile(r"^bigint.*", re.IGNORECASE), types.BigInteger()),
(re.compile(r"^real.*", re.IGNORECASE), types.Float()),
(re.compile(r"^double.*", re.IGNORECASE), types.Float()),
(re.compile(r"^decimal.*", re.IGNORECASE), types.DECIMAL()),
(
re.compile(r"^boolean.*", re.IGNORECASE),
types.Boolean(),
utils.GenericDataType.BOOLEAN,
),
(
re.compile(r"^tinyint.*", re.IGNORECASE),
TinyInteger(),
utils.GenericDataType.NUMERIC,
),
(
re.compile(r"^smallint.*", re.IGNORECASE),
types.SmallInteger(),
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Are types.SMALLINT and types.SmallInteger() interchangeable? If yes, can we stick to just one of them?

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Changed it to keep it consistent

utils.GenericDataType.NUMERIC,
),
(
re.compile(r"^integer.*", re.IGNORECASE),
types.Integer(),
utils.GenericDataType.NUMERIC,
),
(
re.compile(r"^bigint.*", re.IGNORECASE),
types.BigInteger(),
utils.GenericDataType.NUMERIC,
),
(
re.compile(r"^real.*", re.IGNORECASE),
types.Float(),
utils.GenericDataType.NUMERIC,
),
(
re.compile(r"^double.*", re.IGNORECASE),
types.Float(),
utils.GenericDataType.NUMERIC,
),
(
re.compile(r"^decimal.*", re.IGNORECASE),
types.DECIMAL(),
utils.GenericDataType.NUMERIC,
),
(
re.compile(r"^varchar(\((\d+)\))*$", re.IGNORECASE),
lambda match: types.VARCHAR(int(match[2])) if match[2] else types.String(),
utils.GenericDataType.STRING,
),
(
re.compile(r"^char(\((\d+)\))*$", re.IGNORECASE),
lambda match: types.CHAR(int(match[2])) if match[2] else types.CHAR(),
utils.GenericDataType.STRING,
),
(
re.compile(r"^varbinary.*", re.IGNORECASE),
types.VARBINARY(),
utils.GenericDataType.STRING,
),
(
re.compile(r"^json.*", re.IGNORECASE),
types.JSON(),
utils.GenericDataType.STRING,
),
(
re.compile(r"^date.*", re.IGNORECASE),
types.DATE(),
utils.GenericDataType.TEMPORAL,
),
(
re.compile(r"^timestamp.*", re.IGNORECASE),
types.TIMESTAMP(),
utils.GenericDataType.TEMPORAL,
),
(
re.compile(r"^time.*", re.IGNORECASE),
types.Time(),
utils.GenericDataType.TEMPORAL,
),
(
re.compile(r"^interval.*", re.IGNORECASE),
Interval(),
utils.GenericDataType.TEMPORAL,
),
(re.compile(r"^varbinary.*", re.IGNORECASE), types.VARBINARY()),
(re.compile(r"^json.*", re.IGNORECASE), types.JSON()),
(re.compile(r"^date.*", re.IGNORECASE), types.DATE()),
(re.compile(r"^timestamp.*", re.IGNORECASE), types.TIMESTAMP()),
(re.compile(r"^time.*", re.IGNORECASE), types.Time()),
(re.compile(r"^interval.*", re.IGNORECASE), Interval()),
(re.compile(r"^array.*", re.IGNORECASE), Array()),
(re.compile(r"^map.*", re.IGNORECASE), Map()),
(re.compile(r"^row.*", re.IGNORECASE), Row()),
(re.compile(r"^array.*", re.IGNORECASE), Array(), utils.GenericDataType.STRING),
(re.compile(r"^map.*", re.IGNORECASE), Map(), utils.GenericDataType.STRING),
(re.compile(r"^row.*", re.IGNORECASE), Row(), utils.GenericDataType.STRING),
)

@classmethod
Expand Down
18 changes: 17 additions & 1 deletion superset/utils/core.py
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Original file line number Diff line number Diff line change
Expand Up @@ -82,7 +82,7 @@
from sqlalchemy.engine import Connection, Engine
from sqlalchemy.engine.reflection import Inspector
from sqlalchemy.sql.type_api import Variant
from sqlalchemy.types import TEXT, TypeDecorator
from sqlalchemy.types import TEXT, TypeDecorator, TypeEngine
from typing_extensions import TypedDict

import _thread # pylint: disable=C0411
Expand Down Expand Up @@ -148,6 +148,10 @@ class GenericDataType(IntEnum):
STRING = 1
TEMPORAL = 2
BOOLEAN = 3
# ARRAY = 4 # Mapping all the complex data types to STRING for now
# JSON = 5 # and leaving these as a reminder.
# MAP = 6
# ROW = 7


class ChartDataResultFormat(str, Enum):
Expand Down Expand Up @@ -306,6 +310,18 @@ class TemporalType(str, Enum):
TIMESTAMP = "TIMESTAMP"


class ColumnTypeSource(Enum):
GET_TABLE = 1
CURSOR_DESCRIPION = 2


class ColumnSpec(NamedTuple):
sqla_type: Union[TypeEngine, str]
generic_type: GenericDataType
is_dttm: bool
python_date_format: Optional[str] = None


try:
# Having might not have been imported.
class DimSelector(Having):
Expand Down