superset/db_engine_specs/clickhouse.py

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from datetime import datetime

from superset.db_engine_specs.base import BaseEngineSpec


class ClickHouseEngineSpec(BaseEngineSpec):  # pylint: disable=abstract-method
    """Dialect for ClickHouse analytical DB."""

    engine = "clickhouse"

    time_secondary_columns = True
    time_groupby_inline = True

    _time_grain_functions = {
        None: "{col}",
        "PT1M": "toStartOfMinute(toDateTime({col}))",
        "PT5M": "toDateTime(intDiv(toUInt32(toDateTime({col})), 300)*300)",
        "PT10M": "toDateTime(intDiv(toUInt32(toDateTime({col})), 600)*600)",
        "PT15M": "toDateTime(intDiv(toUInt32(toDateTime({col})), 900)*900)",
        "PT0.5H": "toDateTime(intDiv(toUInt32(toDateTime({col})), 1800)*1800)",
        "PT1H": "toStartOfHour(toDateTime({col}))",
        "P1D": "toStartOfDay(toDateTime({col}))",
        "P1W": "toMonday(toDateTime({col}))",
        "P1M": "toStartOfMonth(toDateTime({col}))",
        "P0.25Y": "toStartOfQuarter(toDateTime({col}))",
        "P1Y": "toStartOfYear(toDateTime({col}))",
    }

    @classmethod
    def convert_dttm(cls, target_type: str, dttm: datetime) -> str:
        tt = target_type.upper()
        if tt == "DATE":
            return "toDate('{}')".format(dttm.strftime("%Y-%m-%d"))
        if tt == "DATETIME":
            return "toDateTime('{}')".format(dttm.strftime("%Y-%m-%d %H:%M:%S"))
        return "'{}'".format(dttm.strftime("%Y-%m-%d %H:%M:%S"))