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dates.py
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dates.py
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import datetime
import pytz
from dateutil.relativedelta import relativedelta
from pysparkling.sql.casts import get_time_formatter, get_unix_timestamp_parser
from pysparkling.sql.expressions.expressions import Expression, UnaryExpression
from pysparkling.sql.types import DateType, TimestampType, FloatType
from pysparkling.utils import parse_tz
GMT_TIMEZONE = pytz.timezone("GMT")
DAYS_OF_WEEK = ("MON", "TUE", "WED", "THU", "FRI", "SAT", "SUN")
class AddMonths(Expression):
def __init__(self, start_date, num_months):
super(AddMonths, self).__init__(start_date)
self.start_date = start_date
self.num_months = num_months
def eval(self, row, schema):
return (self.start_date.cast(DateType()).eval(row, schema)
+ relativedelta(months=self.num_months))
def __str__(self):
return "add_months({0}, {1})".format(self.start_date, self.num_months)
class DateAdd(Expression):
def __init__(self, start_date, num_days):
super(DateAdd, self).__init__(start_date)
self.start_date = start_date
self.num_days = num_days
self.timedelta = datetime.timedelta(days=num_days)
def eval(self, row, schema):
return self.start_date.cast(DateType()).eval(row, schema) + self.timedelta
def __str__(self):
return "date_add({0}, {1})".format(self.start_date, self.num_days)
class DateSub(Expression):
def __init__(self, start_date, num_days):
super(DateSub, self).__init__(start_date)
self.start_date = start_date
self.num_days = num_days
self.timedelta = datetime.timedelta(days=num_days)
def eval(self, row, schema):
return self.start_date.cast(DateType()).eval(row, schema) - self.timedelta
def __str__(self):
return "date_sub({0}, {1})".format(self.start_date, self.num_days)
class Year(UnaryExpression):
def eval(self, row, schema):
return self.column.cast(DateType()).eval(row, schema).year
def __str__(self):
return "year({0})".format(self.column)
class Month(UnaryExpression):
def eval(self, row, schema):
return self.column.cast(DateType()).eval(row, schema).month
def __str__(self):
return "month({0})".format(self.column)
class Quarter(UnaryExpression):
def eval(self, row, schema):
month = self.column.cast(DateType()).eval(row, schema).month
return 1 + int((month - 1) / 3)
def __str__(self):
return "quarter({0})".format(self.column)
class Hour(UnaryExpression):
def eval(self, row, schema):
return self.column.cast(TimestampType()).eval(row, schema).hour
def __str__(self):
return "hour({0})".format(self.column)
class Minute(UnaryExpression):
def eval(self, row, schema):
return self.column.cast(TimestampType()).eval(row, schema).minute
def __str__(self):
return "minute({0})".format(self.column)
class Second(UnaryExpression):
def eval(self, row, schema):
return self.column.cast(TimestampType()).eval(row, schema).second
def __str__(self):
return "second({0})".format(self.column)
class DayOfMonth(UnaryExpression):
def eval(self, row, schema):
return self.column.cast(DateType()).eval(row, schema).day
def __str__(self):
return "dayofmonth({0})".format(self.column)
class DayOfYear(UnaryExpression):
def eval(self, row, schema):
value = self.column.cast(DateType()).eval(row, schema)
day_from_the_first = value - datetime.date(value.year, 1, 1)
return 1 + day_from_the_first.days
def __str__(self):
return "dayofyear({0})".format(self.column)
class LastDay(UnaryExpression):
def eval(self, row, schema):
value = self.column.cast(DateType()).eval(row, schema)
first_of_next_month = value + relativedelta(months=1, day=1)
return first_of_next_month - datetime.timedelta(days=1)
def __str__(self):
return "last_day({0})".format(self.column)
class WeekOfYear(UnaryExpression):
def eval(self, row, schema):
return self.column.cast(DateType()).eval(row, schema).isocalendar()[1]
def __str__(self):
return "weekofyear({0})".format(self.column)
class DayOfWeek(UnaryExpression):
def eval(self, row, schema):
date = self.column.cast(DateType()).eval(row, schema)
return date.isoweekday() + 1 if date.isoweekday() != 7 else 1
def __str__(self):
return "dayofweek({0})".format(self.column)
class NextDay(Expression):
def __init__(self, column, day_of_week):
super(NextDay, self).__init__(column)
self.column = column
self.day_of_week = day_of_week
def eval(self, row, schema):
value = self.column.cast(DateType()).eval(row, schema)
if self.day_of_week.upper() not in DAYS_OF_WEEK:
return None
today = value.isoweekday()
target = DAYS_OF_WEEK.index(self.day_of_week.upper()) + 1
delta = target - today
if delta <= 0:
delta += 7
return value + datetime.timedelta(days=delta)
def __str__(self):
return "next_day({0}, {1})".format(self.column, self.day_of_week)
class MonthsBetween(Expression):
def __init__(self, column1, column2, round_off):
super(MonthsBetween, self).__init__(column1, column2)
self.column1 = column1
self.column2 = column2
self.round_off = round_off
def eval(self, row, schema):
value_1 = self.column1.cast(TimestampType()).eval(row, schema)
value_2 = self.column2.cast(TimestampType()).eval(row, schema)
if (not isinstance(value_1, datetime.datetime)
or not isinstance(value_2, datetime.datetime)):
return None
one_day = datetime.timedelta(days=1)
value_1_is_the_last_of_its_month = (value_1.month != (value_1 + one_day).month)
value_2_is_the_last_of_its_month = (value_2.month != (value_2 + one_day).month)
if value_1.day == value_2.day or (
value_1_is_the_last_of_its_month and
value_2_is_the_last_of_its_month
):
# Special cases where time of day is not consider
diff = ((value_1.year - value_2.year) * 12 +
(value_1.month - value_2.month))
else:
day_offset = (value_1.day - value_2.day +
(value_1.hour - value_2.hour) / 24 +
(value_1.minute - value_2.minute) / 1440 +
(value_1.second - value_2.second) / 86400)
diff = ((value_1.year - value_2.year) * 12 +
(value_1.month - value_2.month) * 1 +
day_offset / 31)
if self.round_off:
return float(round(diff, 8))
return float(diff)
def __str__(self):
return "months_between({0}, {1}, {2})".format(
self.column1,
self.column2,
str(self.round_off).lower()
)
class DateDiff(Expression):
def __init__(self, column1, column2):
super(DateDiff, self).__init__(column1, column2)
self.column1 = column1
self.column2 = column2
def eval(self, row, schema):
value_1 = self.column1.cast(DateType()).eval(row, schema)
value_2 = self.column2.cast(DateType()).eval(row, schema)
if (not isinstance(value_1, datetime.date)
or not isinstance(value_2, datetime.date)):
return None
return (value_1 - value_2).days
def __str__(self):
return "datediff({0}, {1})".format(self.column1, self.column2)
class FromUnixTime(Expression):
def __init__(self, column, f):
super(FromUnixTime, self).__init__(column)
self.column = column
self.format = f
self.formatter = get_time_formatter(self.format)
def eval(self, row, schema):
timestamp = self.column.cast(FloatType()).eval(row, schema)
return self.formatter(datetime.datetime.fromtimestamp(timestamp))
def __str__(self):
return "from_unixtime({0}, {1})".format(self.column, self.format)
class DateFormat(Expression):
def __init__(self, column, f):
super(DateFormat, self).__init__(column)
self.column = column
self.format = f
self.formatter = get_time_formatter(self.format)
def eval(self, row, schema):
timestamp = self.column.cast(TimestampType()).eval(row, schema)
return self.formatter(timestamp)
def __str__(self):
return "date_format({0}, {1})".format(self.column, self.format)
class CurrentTimestamp(Expression):
def __init__(self):
super(CurrentTimestamp, self).__init__()
self.current_timestamp = None
def eval(self, row, schema):
return self.current_timestamp
def initialize(self, partition_index):
super(CurrentTimestamp, self).initialize(partition_index)
self.current_timestamp = datetime.datetime.now()
def __str__(self):
return "current_timestamp()"
class CurrentDate(Expression):
def __init__(self):
super(CurrentDate, self).__init__()
self.current_timestamp = None
def eval(self, row, schema):
return self.current_timestamp.date()
def initialize(self, partition_index):
super(CurrentDate, self).initialize(partition_index)
self.current_timestamp = datetime.datetime.now()
def __str__(self):
return "current_date()"
class UnixTimestamp(Expression):
def __init__(self, column, f):
super(UnixTimestamp, self).__init__(column)
self.column = column
self.format = f
self.parser = get_unix_timestamp_parser(self.format)
def eval(self, row, schema):
datetime_as_string = self.column.eval(row, schema)
return self.parser(datetime_as_string)
def __str__(self):
return "unix_timestamp({0}, {1})".format(self.column, self.format)
class ParseToTimestamp(Expression):
def __init__(self, column, f):
super(ParseToTimestamp, self).__init__(column)
self.column = column
self.format = f
self.parser = get_unix_timestamp_parser(self.format)
def eval(self, row, schema):
datetime_as_string = self.column.eval(row, schema)
return datetime.datetime.fromtimestamp(self.parser(datetime_as_string))
def __str__(self):
return "to_timestamp('{0}'{1})".format(
self.column,
", '{0}'".format(self.format) if self.format is not None else ""
)
class ParseToDate(Expression):
def __init__(self, column, f):
super(ParseToDate, self).__init__(column)
self.column = column
self.format = f
self.parser = get_unix_timestamp_parser(self.format)
def eval(self, row, schema):
datetime_as_string = self.column.eval(row, schema)
return datetime.date.fromtimestamp(self.parser(datetime_as_string))
def __str__(self):
return "to_date('{0}'{1})".format(
self.column,
", '{0}'".format(self.format) if self.format is not None else ""
)
class TruncDate(Expression):
def __init__(self, column, level):
super(TruncDate, self).__init__(column)
self.column = column
self.level = level
def eval(self, row, schema):
value = self.column.cast(DateType()).eval(row, schema)
if self.level in ('year', 'yyyy', 'yy'):
return datetime.date(value.year, 1, 1)
if self.level in ('month', 'mon', 'mm'):
return datetime.date(value.year, value.month, 1)
return None
def __str__(self):
return "trunc({0}, {1})".format(self.column, self.level)
class TruncTimestamp(Expression):
def __init__(self, level, column):
super(TruncTimestamp, self).__init__(column)
self.column = column
self.level = level
def eval(self, row, schema):
value = self.column.cast(TimestampType()).eval(row, schema)
day_truncation = self.truncate_to_day(value)
if day_truncation:
return day_truncation
time_truncated = self.truncate_to_time(value)
if time_truncated:
return time_truncated
return None
def truncate_to_day(self, value):
if self.level in ('year', 'yyyy', 'yy'):
return datetime.datetime(value.year, 1, 1)
if self.level in ('month', 'mon', 'mm'):
return datetime.datetime(value.year, value.month, 1)
if self.level in ('day', 'dd'):
return datetime.datetime(value.year, value.month, value.day)
if self.level in ('quarter',):
quarter_start_month = int((value.month - 1) / 3) * 3 + 1
return datetime.datetime(value.year, quarter_start_month, 1)
if self.level in ('week',):
return datetime.datetime(
value.year, value.month, value.day
) - datetime.timedelta(days=value.isoweekday() - 1)
return None
def truncate_to_time(self, value):
if self.level in ('hour',):
return datetime.datetime(value.year, value.month, value.day, value.hour)
if self.level in ('minute',):
return datetime.datetime(value.year, value.month, value.day, value.hour, value.minute)
if self.level in ('second',):
return datetime.datetime(
value.year, value.month, value.day, value.hour, value.minute, value.second
)
return None
def __str__(self):
return "date_trunc({0}, {1})".format(self.level, self.column)
class FromUTCTimestamp(Expression):
def __init__(self, column, tz):
super(FromUTCTimestamp, self).__init__(column)
self.column = column
self.tz = tz
self.pytz = parse_tz(tz)
def eval(self, row, schema):
value = self.column.cast(TimestampType()).eval(row, schema)
if self.pytz is None:
return value
gmt_date = GMT_TIMEZONE.localize(value)
local_date = gmt_date.astimezone(self.pytz)
return local_date.replace(tzinfo=None)
def __str__(self):
return "from_utc_timestamp({0}, {1})".format(self.column, self.tz)
class ToUTCTimestamp(Expression):
def __init__(self, column, tz):
super(ToUTCTimestamp, self).__init__(column)
self.column = column
self.tz = tz
self.pytz = parse_tz(tz)
def eval(self, row, schema):
value = self.column.cast(TimestampType()).eval(row, schema)
if self.pytz is None:
return value
local_date = self.pytz.localize(value)
gmt_date = local_date.astimezone(GMT_TIMEZONE)
return gmt_date.replace(tzinfo=None)
def __str__(self):
return "to_utc_timestamp({0}, {1})".format(self.column, self.tz)
__all__ = [
"ToUTCTimestamp", "FromUTCTimestamp", "TruncTimestamp", "TruncDate", "ParseToDate",
"ParseToTimestamp", "UnixTimestamp", "CurrentTimestamp", "FromUnixTime", "WeekOfYear",
"NextDay", "MonthsBetween", "LastDay", "DayOfYear", "DayOfMonth", "DayOfWeek", "Month",
"Quarter", "Year", "DateDiff", "DateSub", "DateAdd", "DateFormat", "CurrentDate",
"AddMonths", "Hour", "Minute", "Second"
]