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Return Type

Name(Signature)

Description

OSS

string

from_unixtime(bigint unixtime[,string pattern])

Converts a number of seconds since epoch (1970-01-01 00:00:00 UTC) to a string representing the timestamp of that moment in the current time zone(using config "hive.local.time.zone") using the specified pattern. If the pattern is missing the default is used ('uuuu-MM-dd HH:mm:ss' or yyyy-MM-dd HH:mm:ss'). Example: from_unixtime(0)=1970-01-01 00:00:00 (hive.local.time.zone=Etc/GMT)

Status
colourGreen
titleNew

As of Hive 4.0.0 the "hive.datetime.formatter" property can be used to control the underlying formatter implementation and as a consequence the accepted patterns and their behavior.  Earlier versions used https://docs.oracle.com/javase/8/docs/api/java/text/SimpleDateFormat.html as the underlying formatter.

GenericUDFFromUnixTime

bigint

unix_timestamp()

Gets the current Unix timestamp in seconds. This function is not deterministic and its value is not fixed for the scope of a query execution, therefore prevents proper optimization of queries - this has been deprecated since 2.0 in favour of CURRENT_TIMESTAMP constant.



GenericUDFUnixTimeStamp

bigint

unix_timestamp(string date)

Converts a DateTimestring to unix time (seconds since epoch) using the default pattern(s). The default accepted patterns depend on the underlying formatter implementation. The DateTime string does not contain a timezone so the conversion uses the local time zone as specified by "hive.local.time.zone" property. Returns null when the conversion fails. Example: unix_timestamp('2009-03-20 11:30:01') = 1237573801

Status
colourGreen
titleNew

As of Hive 4.0.0 the "hive.datetime.formatter" property can be used to control the underlying formatter implementation and as a consequence the accepted patterns and their behavior. Earlier versions used https://docs.oracle.com/javase/8/docs/api/java/text/SimpleDateFormat.html as the underlying formatter.

bigint

unix_timestamp(string date,string pattern)

Converts a date-time string to unix time (seconds since epoch) using the specified pattern. The accepted patterns and their behavior depend on the underlying formatter implementation. Returns null when the conversion fails. Example: unix_timestamp('2009-03-20', 'uuuu-MM-dd') = 1237532400

Status
colourGreen
titleNew

As of Hive 4.0.0 the "hive.datetime.formatter" property can be used to control the underlying formatter implementation, and as a consequence the accepted patterns and their behavior.  Earlier versions used https://docs.oracle.com/javase/8/docs/api/java/text/SimpleDateFormat.html as the underlying formatter.

date

to_date(string timestamp)

Returns the date part of a timestamp date object. Example: to_date("1970-01-01 00:00:00") 

GenericUDFDate

int

year(string date)

Returns the year part of a date or a timestamp string: year("1970-01-01 00:00:00") = 1970, year("1970-01-01") = 1970.

UDFYear

int

quarter(date/timestamp/string)Returns the quarter of the year for a date, timestamp, or string in the range 1 to 4. Example: quarter('2015-04-08') = 2.GenericUDFQuarter

int

month(string date)

Returns the month part of a date or a timestamp string. Example: month("1970-11-01 00:00:00") = 11, month("1970-11-01") = 11.

UDFMonth

int

day(string date) dayofmonth(date)

Returns the day part of a date or a timestamp string. Example: day("1970-11-01 00:00:00") = 1, day("1970-11-01") = 1.

UDFDayOfMonth

int

hour(string date)

Returns the hour of the timestamp: Example: hour('2009-07-30 12:58:59') = 12, hour('12:58:59') = 12.

UDFHour

int

minute(string date)

Returns the minute of the timestamp.

UDFMinute

int

second(string date)

Returns the second of the timestamp.

UDFSecond

int

weekofyear(string date)

Returns the week number of a timestamp string. Example: weekofyear("1970-11-01 00:00:00") = 44 or weekofyear("1970-11-01") = 44.

UDFWeekOfYear

int

extract(field FROM source)

Retrieve fields such as days or hours from the source. The source must be a date, timestamp,interval, or string that can be convertedinto either a date or timestamp. Supported fields include day, dayofweek, hour, minute, month, quarter, second, week and year.

Examples:

  1. select extract(month from "2016-10-20") results in 10.

  2. select extract(hour from "2016-10-20 05:06:07") results in 5.

  3. select extract(dayofweek from "2016-10-20 05:06:07") results in 5.

  4. select extract(month frominterval from interval '1-3' year to month) results in 3.

  5. select extract(minute frominterval from interval '3 12:20:30' day to second) results in 20.


int

datediff(string enddate,string startdate)

Returns the number of days from startdate to end date. Example: datediff('2009-03-01', '2009-02-27') = 2.

GenericUDFDateDiff

date

date_add(date/timestamp/string startdate, tinyint/smallint/int days)

Adds a number of days to startdate. Example: date_add('2008-12-31', 1) = '2009-01-01'.

GenericUDFDateAdd

date

date_sub(date/timestamp/string startdate, tinyint/smallint/int days)

Subtracts a number of days to startdate: date_sub('2008-12-31', 1) = '2008-12-30'.

GenericUDFDateSub

timestamp

from_utc_timestamp({any primitive type} ts,string timezone)

Converts a timestamp* in UTC to a given timezone.

* timestamp is a primitive type, including timestamp/date, tinyint/smallint/int/bigint, float/double and decimal.

Fractional values are considered as seconds.integer values are considered as milliseconds. For example, from_utc_timestamp(2592000.0,'PST'), from_utc_timestamp(2592000000,'PST') and from_utc_timestamp(timestamp '1970-01-30 16:00:00','PST') all return the timestamp 1970-01-30 08:00:00.

GenericUDFFromUtcTimestamp

timestamp

to_utc_timestamp({any primitive type} ts,string timezone)

Converts a timestamp* in a given timezone to UTC.

* timestamp is a primitive type, including timestamp/date, tinyint/smallint/int/bigint, float/double and decimal.

Fractional values are considered as seconds.integer values are considered as milliseconds. For example, to_utc_timestamp(2592000.0,'PST'), to_utc_timestamp(2592000000,'PST') and to_utc_timestamp(timestamp '1970-01-30 16:00:00','PST') all return the timestamp 1970-01-31 00:00:00.

GenericUDFToUtcTimestamp

datecurrent_date

Returns the current date at the start of query evaluation. All calls of current_date within the same query return the same value.

GenericUDFCurrentDate

timestampcurrent_timestamp

Returns the current timestamp at the start of query evaluation. All calls of current_timestamp within the same query return the same value.

GenericUDFCurrentTimestamp

stringadd_months(string start_date,int num_months, output_date_format)

Returns the date that is num_months after start_date. start_date is a string, date or timestamp. num_months is anintegeran integer. If start_date is the last day of the month or if the resulting month has fewer days than the day component of start_date, then the result is the last day of the resulting month. Otherwise, the result has the same day component as start_date. The default output format is 'yyyy-MM-dd'.

Status
colourGreen
titleNew

Before Hive 4.0.0, the time part of the date is ignored. As of Hive 4.0.0, add_months supports an optional argument output_date_format, which accepts a string that represents a valid date format for the output. This allows to retain the time format in the output.

For example :

add_months('2009-08-31', 1) returns '2009-09-30'.
add_months('2017-12-31 14:15:16', 2, 'YYYY-MM-dd HH:mm:ss') returns '2018-02-28 14:15:16'.

GenericUDFAddMonths

stringlast_day(string date)Returns the last day of the month to which the date belongs. date is a string in the format 'yyyy-MM-dd HH:mm:ss' or 'yyyy-MM-dd'. The time part of the date is ignored!GenericUDFLastDay
stringnext_day(string start_date,string day_of_week)Returns the first date which is later than start_date and named as day_of_week.  start_date  is astringa string/date/timestamp. day_of_week is 2 letters, 3 letters or full name of the day of the week (e.g. Mo, tue, FRIDAY). The time part of start_date is ignored. Example: next_day('2015-01-14', 'TU') = 2015-01-20.GenericUDFNextDay
stringtrunc(string date,string format)Returns date truncated to the unit specified by the format. Supported formats: MONTH/MON/MM, YEAR/YYYY/YY. Example: trunc('2015-03-17', 'MM') = 2015-03-01.GenericUDFTrunc
doublemonths_between(date1, date2)Returns the number of months between dates date1 and date2. If date1 is later than date2, then the result is positive. If date1 is earlier than date , then the result is negative. If date1 and date2 are either the same days of the month or both last days of months, then the result is always aninteger. Otherwise, the UDF calculates the fractional portion of the result based on a 31-day month and considers the difference in time components date1 and date2. date1 and date2 type can be date, timestamp or string in the format 'yyyy-MM-dd' or 'yyyy-MM-dd HH:mm:ss'. The result is rounded to 8 decimal places. Example: months_between('1997-02-28 10:30:00', '1996-10-30') = 3.94959677GenericUDFMonthsBetween
stringdate_format(date/timestamp/string ts,string pattern)

Converts a date/timestamp/string to a value of string using the specified pattern. The accepted patterns and their behavior depend on the underlying formatter implementation. The pattern argument should be constant. Example: date_format('2015-04-08', 'y') = '2015'.

date_format can be used to implement other UDFs, e.g.:

  • dayname(date) is date_format(date, 'EEEE')
  • dayofyear(date) is date_format(date, 'D')

Status
colourGreen
titleNew

As of Hive 4.0.0 the "hive.datetime.formatter" property can be used to control the underlying formatter implementation and as a consequence the accepted patterns and their behavior.  Earlier versions used https://docs.oracle.com/javase/8/docs/api/java/text/SimpleDateFormat.html as the underlying formatter.

GenericUDFDateFormat

...

Return Type

Name (Signature)

Description

OSS

double

round(double a)

Returns the rounded bigint value of a.

GenericUDFRound

double

round(double a,int d)

Returns a rounded to d decimal places.

doublebround(double a)Returns the rounded bigint value of a using HALF_EVEN rounding mode. Also known as Gaussian rounding or bankers' rounding. Example: bround(2.5) = 2, bround(3.5) = 4.GenericUDFBRound
doublebround(double a,int d)Returns a rounded to d decimal places using HALF_EVEN rounding mode.  Example: bround(8.25, 1) = 8.2, bround(8.35, 1) = 8.4.

bigint

floor(double a)

Returns the maximum bigint value that is equal to or less than a.

GenericUDFFloor

bigint

ceil(double a), ceiling(double a)

Returns the minimum bigint value that is equal to or greater than a.

GenericUDFCeil

double

rand(), rand(INT seed)

Returns a random number (that changes from row to row) that is distributed uniformly from 0 to 1. Specifying the seed will make sure the generated random number sequence is deterministic.

UDFRand

double

exp(double a), exp(decimal a)

Returns ea where e is the base of the natural logarithm.

UDFExp

double

ln(double a), ln(decimal a)

Returns the natural logarithm of the argument a.

UDFLn

double

log10(double a), log10(decimal a)

Returns the base-10 logarithm of the argument a.

UDFLog10

double

log2(double a), log2(decimal a)

Returns the base-2 logarithm of the argument a. 

UDFLog2

double

log(double base, double a)

log(decimal base, decimal a)

Returns the base-base logarithm of the argument a.

UDFLog

double

pow(double a, double p), power(double a, double p)

Returns ap.

GenericUDFPower

double

sqrt(double a), sqrt(decimal a)

Returns the square root of a.

UDFSqrt

string

bin(bigint a)

Returns the number in binary format.

UDFBin

string

hex(bigint a) hex(STRING string a) hex(BINARY binary a)

If the argument is anint an int or binary, hex returns the number as a string in hexadecimal format. Otherwise, if the number is a string, it converts each characterinto character into its hexadecimal representation and returns the resulting string. 

UDFHex

binary

unhex(STRING a)

Inverse of hex.interprets each pair of characters as a hexadecimal number and converts to the byte representation of the number.

UDFUnhex

string

conv(bigint num,int from_base,int to_base), conv(STRING num,int from_base,int to_base)

Converts a number from a given base to another.

UDFConv

double

abs(double a)

Returns the absolute value.

GenericUDFAbs

int or double

pmod(INT a,int b), pmod(double a, double b)

Returns the positive value of a mod b.

GenericUDFOPMod

double

sin(double a), sin(decimal a)

Returns the sine of a (a is in radians).

UDFSin

double

asin(double a), asin(decimal a)

Returns the arc sin of a if -1<=a<=1 or NULL otherwise. 

UDFAsin

double

cos(double a), cos(decimal a)

Returns the cosine of a (a is in radians). 

UDFCos

double

acos(double a), acos(decimal a)

Returns the arccosine of a if -1<=a<=1 or NULL otherwise.

UDFAcos

double

tan(double a), tan(decimal a)

Returns the tangent of a (a is in radians).

UDFTan

double

atan(double a), atan(decimal a)

Returns the arctangent of a.

UDFAtan

double

degrees(double a), degrees(decimal a)

Converts value of a from radians to degrees. 

UDFDegrees

double

radians(double a), radians(double a)

Converts value of a from degrees to radians. 

UDFRadians

int or double

positive(INT a), positive(double a)

Returns a.

GenericUDFOPPositive

int or double

negative(INT a), negative(double a)

Returns -a.

GenericUDFOPNegative

double orintor int

sign(double a), sign(decimal a)

Returns the sign of a as '1.0' (if a is positive) or '-1.0' (if a is negative), '0.0' otherwise. The decimal version returnsint returns int instead of double. 

UDFSign

double

e()

Returns the value of e.

UDFE

double

pi()

Returns the value of pi.

UDFPI

bigintfactorial(INT a)Returns the factorial of a Valid a is [0..20].GenericUDFFactorial
doublecbrt(double a)Returns the cube root of a double value.GenericUDFCbrt

int

bigint

shiftleft(TINYINT|SMALLINT|INT a,int b)

shiftleft(bigint a,int b)

Bitwise left shift. Shifts a b positions to the left.

Returnsint Returns int for tinyint, smallint andint a. Returns bigint for bigint a.

UDFOPBitShiftLeft

int

bigint

shiftright(TINYINT|SMALLINT|INT a,int b)

shiftright(bigint a,int b)

Bitwise right shift. Shifts a b positions to the right.

Returnsint Returns int for tinyint, smallint andint a. Returns bigint for bigint a.

UDFOPBitShiftRight

int

bigint

shiftrightunsigned(TINYINT|SMALLINT|INT a,int b),

shiftrightunsigned(bigint a,int b)

Bitwise unsigned right shift. Shifts a b positions to the right.

Returnsint Returns int for tinyint, smallint andint a. Returns bigint for bigint a.

UDFOPBitShiftRightUnsigned

Tgreatest(T v1, T v2, ...)Returns the greatest value of the list of values. Fixed to return NULL when one or more arguments are NULL, and strict type restriction relaxed, consistent with ">" operator.GenericUDFGreatest
Tleast(T v1, T v2, ...)Returns the least value of the list of values. Fixed to return NULL when one or more arguments are NULL, and strict type restriction relaxed, consistent with "<" operator.GenericUDFLeast
intwidth_bucket(NUMERIC expr, NUMERIC min_value, NUMERIC max_value,int num_buckets)

Returns aninteger an integer between 0 and num_buckets+1 by mapping exprinto expr into the ith equally sized bucket. Buckets are made by dividing [min_value, max_value]into equally sized regions. If expr < min_value, return 1, if expr > max_value return num_buckets+1. See https://docs.oracle.com/cd/B19306_01/server.102/b14200/functions214.htm

GenericUDFWidthBucket

...

Return Type

Name(Signature)

Description

OSS

binary

binary(string|binary)

Casts the parameterinto parameter into a binary.

GenericUDFBaseBinary

Expected "=" to follow "type"

cast(expr as <type>)

Converts the results of the expression expr to <type>. For example, cast('1' as bigint) will convert the string '1' to itsintegral its integral representation. A null is returned if the conversion does not succeed. If cast(expr as boolean) Hive returns true for a non-empty string.


...

Return Type

Name(Signature)

Description

T

if(boolean testCondition, T valueTrue, T valueFalseOrNull)

Returns valueTrue when testCondition is true, returns valueFalseOrNull otherwise.

booleanisnull( a )Returns true if a is NULL and false otherwise.
booleanisnotnull ( a )Returns true if a is not NULL and false otherwise.
Tnvl(T value, T default_value)Returns default value if value is null else returns value.

T

COALESCE(T v1, T v2, ...)

Returns the first v that is not NULL, or NULL if all v's are NULL.

T

CASE a WHEN b THEN c [WHEN d THEN e]* [ELSE f] END

When a = b, returns c; when a = d, returns e; else returns f.

T

CASE WHEN a THEN b [WHEN c THEN d]* [ELSE e] END

When a = true, returns b; when c = true, returns d; else returns e.

Tnullif( a, b )

Returns NULL if a=b; otherwise returns a.

Tip
titleShorthand for

CASE WHEN a = b then NULL else a


voidassert_true(boolean condition)Throw an exception if 'condition' is not true, otherwise, return null. For example, select assert_true (2<1).

...