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Enable Teradata (#5870)

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* Enable Teradata 

New DB engine spec for Teradata:
- LimitMethod should be WRAP_SQL since Teradata does not supporting "LIMIT" clause  (TOP)
- Timegrains for Teradata is added

* Update formatting to pass flake8 tests
This commit is contained in:
livinm
2018-09-13 08:01:25 -07:00
committed by Maxime Beauchemin
parent 85692612d6
commit 83fa7af42a
1 changed files with 17 additions and 0 deletions
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superset/db_engine_specs.py
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@@ -1490,6 +1490,23 @@ class KylinEngineSpec(BaseEngineSpec):
return "'{}'".format(dttm.strftime('%Y-%m-%d %H:%M:%S'))
class TeradataEngineSpec(BaseEngineSpec):
"""Dialect for Teradata DB."""
engine = 'teradata'
limit_method = LimitMethod.WRAP_SQL
time_grains = (
Grain('Time Column', _('Time Column'), '{col}', None),
Grain('minute', _('minute'), "TRUNC(CAST({col} as DATE), 'MI')", 'PT1M'),
Grain('hour', _('hour'), "TRUNC(CAST({col} as DATE), 'HH')", 'PT1H'),
Grain('day', _('day'), "TRUNC(CAST({col} as DATE), 'DDD')", 'P1D'),
Grain('week', _('week'), "TRUNC(CAST({col} as DATE), 'WW')", 'P1W'),
Grain('month', _('month'), "TRUNC(CAST({col} as DATE), 'MONTH')", 'P1M'),
Grain('quarter', _('quarter'), "TRUNC(CAST({col} as DATE), 'Q')", 'P0.25Y'),
Grain('year', _('year'), "TRUNC(CAST({col} as DATE), 'YEAR')", 'P1Y'),
)
engines = {
o.engine: o for o in globals().values()
if inspect.isclass(o) and issubclass(o, BaseEngineSpec)}