superset/db_engine_specs/snowflake.py

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from urllib import parse

from superset.db_engine_specs.postgres import PostgresBaseEngineSpec


class SnowflakeEngineSpec(PostgresBaseEngineSpec):
    engine = "snowflake"
    force_column_alias_quotes = True
    max_column_name_length = 256

    _time_grain_functions = {
        None: "{col}",
        "PT1S": "DATE_TRUNC('SECOND', {col})",
        "PT1M": "DATE_TRUNC('MINUTE', {col})",
        "PT5M": "DATEADD(MINUTE, FLOOR(DATE_PART(MINUTE, {col}) / 5) * 5, \
                DATE_TRUNC('HOUR', {col}))",
        "PT10M": "DATEADD(MINUTE, FLOOR(DATE_PART(MINUTE, {col}) / 10) * 10, \
                 DATE_TRUNC('HOUR', {col}))",
        "PT15M": "DATEADD(MINUTE, FLOOR(DATE_PART(MINUTE, {col}) / 15) * 15, \
                 DATE_TRUNC('HOUR', {col}))",
        "PT0.5H": "DATEADD(MINUTE, FLOOR(DATE_PART(MINUTE, {col}) / 30) * 30, \
                  DATE_TRUNC('HOUR', {col}))",
        "PT1H": "DATE_TRUNC('HOUR', {col})",
        "P1D": "DATE_TRUNC('DAY', {col})",
        "P1W": "DATE_TRUNC('WEEK', {col})",
        "P1M": "DATE_TRUNC('MONTH', {col})",
        "P0.25Y": "DATE_TRUNC('QUARTER', {col})",
        "P1Y": "DATE_TRUNC('YEAR', {col})",
    }

    @classmethod
    def adjust_database_uri(cls, uri, selected_schema=None):
        database = uri.database
        if "/" in uri.database:
            database = uri.database.split("/")[0]
        if selected_schema:
            selected_schema = parse.quote(selected_schema, safe="")
            uri.database = database + "/" + selected_schema
        return uri

    @classmethod
    def epoch_to_dttm(cls) -> str:
        return "DATEADD(S, {col}, '1970-01-01')"

    @classmethod
    def epoch_ms_to_dttm(cls) -> str:
        return "DATEADD(MS, {col}, '1970-01-01')"