incubator-superset0.99/superset/db_engine_specs/drill.py

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from datetime import datetime
from typing import Optional
from urllib import parse

from sqlalchemy.engine.url import URL

from superset.db_engine_specs.base import BaseEngineSpec


class DrillEngineSpec(BaseEngineSpec):
    """Engine spec for Apache Drill"""

    engine = "drill"

    _time_grain_functions = {
        None: "{col}",
        "PT1S": "NEARESTDATE({col}, 'SECOND')",
        "PT1M": "NEARESTDATE({col}, 'MINUTE')",
        "PT15M": "NEARESTDATE({col}, 'QUARTER_HOUR')",
        "PT0.5H": "NEARESTDATE({col}, 'HALF_HOUR')",
        "PT1H": "NEARESTDATE({col}, 'HOUR')",
        "P1D": "NEARESTDATE({col}, 'DAY')",
        "P1W": "NEARESTDATE({col}, 'WEEK_SUNDAY')",
        "P1M": "NEARESTDATE({col}, 'MONTH')",
        "P0.25Y": "NEARESTDATE({col}, 'QUARTER')",
        "P1Y": "NEARESTDATE({col}, 'YEAR')",
    }

    # Returns a function to convert a Unix timestamp in milliseconds to a date
    @classmethod
    def epoch_to_dttm(cls) -> str:
        return cls.epoch_ms_to_dttm().replace("{col}", "({col}*1000)")

    @classmethod
    def epoch_ms_to_dttm(cls) -> str:
        return "TO_DATE({col})"

    @classmethod
    def convert_dttm(cls, target_type: str, dttm: datetime) -> Optional[str]:
        tt = target_type.upper()
        if tt == "DATE":
            return f"TO_DATE('{dttm.date().isoformat()}', 'yyyy-MM-dd')"
        elif tt == "TIMESTAMP":
            return f"""TO_TIMESTAMP('{dttm.isoformat(sep=" ", timespec="seconds")}', 'yyyy-MM-dd HH:mm:ss')"""  # pylint: disable=line-too-long
        return None

    @classmethod
    def adjust_database_uri(cls, uri: URL, selected_schema: Optional[str]) -> None:
        if selected_schema:
            uri.database = parse.quote(selected_schema, safe="")