parquet_flask/io_logic/parquet_query_condition_management_v3.py [227:252]:
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        return

    def __add_variables_filter(self):
        if len(self.__query_props.variable) < 1:
            return None
        variables_filter = []
        for each in self.__query_props.variable:
            LOGGER.debug(f'setting not null variable: {each}')
            variables_filter.append(f"{each} IS NOT NULL")
        self.__conditions.append(f"({' OR '.join(variables_filter)})")
        return

    def __check_columns(self):
        if len(self.__query_props.columns) < 1:
            self.__columns = []
            return
        variable_columns = []
        for each in self.__query_props.variable:
            variable_columns.append(each)
            if self.__query_props.quality_flag is True:
                LOGGER.debug(f'adding quality flag for : {each}')
                variable_columns.append(f'{each}_quality')
        self.__columns = self.__query_props.columns + variable_columns + self.__columns
        return

    def manage_query_props(self):
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parquet_flask/io_logic/parquet_query_condition_management_v4.py [156:181]:
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        return

    def __add_variables_filter(self):
        if len(self.__query_props.variable) < 1:
            return None
        variables_filter = []
        for each in self.__query_props.variable:
            LOGGER.debug(f'setting not null variable: {each}')
            variables_filter.append(f"{each} IS NOT NULL")
        self.__conditions.append(f"({' OR '.join(variables_filter)})")
        return

    def __check_columns(self):
        if len(self.__query_props.columns) < 1:
            self.__columns = []
            return
        variable_columns = []
        for each in self.__query_props.variable:
            variable_columns.append(each)
            if self.__query_props.quality_flag is True:
                LOGGER.debug(f'adding quality flag for : {each}')
                variable_columns.append(f'{each}_quality')
        self.__columns = self.__query_props.columns + variable_columns + self.__columns
        return

    def manage_query_props(self):
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