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Add basic Impala engine spec (#3225)
From: https://www.cloudera.com/documentation/enterprise/5-8-x/topics/impala_datetime_functions.html
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@ -978,6 +978,31 @@ class BQEngineSpec(BaseEngineSpec):
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return "'{}'".format(dttm.strftime('%Y-%m-%d %H:%M:%S'))
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class ImpalaEngineSpec(BaseEngineSpec):
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"""Engine spec for Cloudera's Impala"""
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engine = 'impala'
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time_grains = (
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Grain("Time Column", _('Time Column'), "{col}"),
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Grain("minute", _('minute'), "TRUNC({col}, 'MI')"),
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Grain("hour", _('hour'), "TRUNC({col}, 'HH')"),
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Grain("day", _('day'), "TRUNC({col}, 'DD')"),
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Grain("week", _('week'), "TRUNC({col}, 'WW')"),
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Grain("month", _('month'), "TRUNC({col}, 'MONTH')"),
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Grain("quarter", _('quarter'), "TRUNC({col}, 'Q')"),
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Grain("year", _('year'), "TRUNC({col}, 'YYYY')"),
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)
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@classmethod
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def convert_dttm(cls, target_type, dttm):
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tt = target_type.upper()
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if tt == 'DATE':
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return "'{}'".format(dttm.strftime('%Y-%m-%d'))
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else:
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return "'{}'".format(dttm.strftime('%Y-%m-%d %H:%M:%S'))
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engines = {
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o.engine: o for o in globals().values()
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if inspect.isclass(o) and issubclass(o, BaseEngineSpec)}
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