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A[n]

A is an Array and n is an int

Returns the nth element in the array A. The first element has index 0 e.g. if A is an array comprising of ['foo', 'bar'] then A[0] returns 'foo' and A[1] returns 'bar'

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M[key]

M is a Map<K, V> and key has type K

Returns the value corresponding to the key in the map e.g. if M is a map comprising of {'f' -> 'foo', 'b' -> 'bar', 'all' -> 'foobar'} then M['all'] returns 'foobar'

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S.x

S is a struct

Returns the x field of S. e.g for struct foobar {int foo, int bar} foobar.foo returns the integer stored in the foo field of the struct.

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string

from_unixtime(bigint unixtime[, string format])

Converts the number of seconds from unix epoch (1970-01-01 00:00:00 UTC) to a string representing the timestamp of that moment in the current system time zone in the format of "1970-01-01 00:00:00"

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bigint

unix_timestamp()

Gets current time stamp using the default time zone.

bigint

unix_timestamp(string date)

Converts time string in format yyyy-MM-dd HH:mm:ss to Unix time stamp, return 0 if fail: unix_timestamp('2009-03-20 11:30:01') = 1237573801

bigint

unix_timestamp(string date, string pattern)

Convert time string with given pattern (see [http://java.sun.com/j2se/1.4.2/docs/api/java/text/SimpleDateFormat.html]) to Unix time stamp, return 0 if fail: unix_timestamp('2009-03-20', 'yyyy-MM-dd') = 1237532400

string

to_date(string timestamp)

Returns the date part of a timestamp string: to_date("1970-01-01 00:00:00") = "1970-01-01"

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

int

month(string date)

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

int

day(string date) dayofmonth(date)

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

int

hour(string date)

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

int

minute(string date)

Returns the minute of the timestamp

int

second(string date)

Returns the second of the timestamp

int

weekofyear(string date)

Return the week number of a timestamp string: weekofyear("1970-11-01 00:00:00") = 44, weekofyear("1970-11-01") = 44

int

datediff(string enddate, string startdate)

Return the number of days from startdate to enddate: datediff('2009-03-01', '2009-02-27') = 2

int

date_add(string startdate, int days)

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

int

date_sub(string startdate, int days)

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

T

if(boolean testCondition, T valueTrue, T valueFalseOrNull)

Return valueTrue when testCondition is true, returns valueFalseOrNull otherwise

T

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

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

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T

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

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

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T

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

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

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int

length(string A)

Returns the length of the string

string

reverse(string A)

Returns the reversed string

string

concat(string A, string B...)

Returns the string resulting from concatenating the strings passed in as parameters in order. e.g. concat('foo', 'bar') results in 'foobar'. Note that this function can take any number of input strings.

string

concat_ws(string SEP, string A, string B...)

Like concat() above, but with custom separator SEP.

string

substr(string A, int start) substring(string A, int start)

Returns the substring of A starting from start position till the end of string A e.g. substr('foobar', 4) results in 'bar' (see [http://dev.mysql.com/doc/refman/5.0/en/string-functions.html#function_substr])

string

substr(string A, int start, int len) substring(string A, int start, int len)

Returns the substring of A starting from start position with length len e.g. substr('foobar', 4, 1) results in 'b' (see [http://dev.mysql.com/doc/refman/5.0/en/string-functions.html#function_substr])

string

upper(string A) ucase(string A)

Returns the string resulting from converting all characters of A to upper case e.g. upper('fOoBaR') results in 'FOOBAR'

string

lower(string A) lcase(string A)

Returns the string resulting from converting all characters of B to lower case e.g. lower('fOoBaR') results in 'foobar'

string

trim(string A)

Returns the string resulting from trimming spaces from both ends of A e.g. trim(' foobar ') results in 'foobar'

string

ltrim(string A)

Returns the string resulting from trimming spaces from the beginning(left hand side) of A e.g. ltrim(' foobar ') results in 'foobar '

string

rtrim(string A)

Returns the string resulting from trimming spaces from the end(right hand side) of A e.g. rtrim(' foobar ') results in ' foobar'

string

regexp_replace(string A, string B, string C)

Returns the string resulting from replacing all substrings in B that match the Java regular expression syntax(See Java regular expressions syntax) with C e.g. regexp_replace("foobar", "oo|ar", "") returns 'fb.' Note that some care is necessary in using predefined character classes: using '\s' as the second argument will match the letter s; '
s' is necessary to match whitespace, etc.

string

regexp_extract(string subject, string pattern, int index)

Returns the string extracted using the pattern. e.g. regexp_extract('foothebar', 'foo(.*?)(bar)', 2) returns 'bar.' Note that some care is necessary in using predefined character classes: using '\s' as the second argument will match the letter s; '
s' is necessary to match whitespace, etc. The 'index' parameter is the Java regex Matcher group() method index. See docs/api/java/util/regex/Matcher.html for more information on the 'index' or Java regex group() method.

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string

parse_url(string urlString, string partToExtract [, string keyToExtract])

Returns the specified part from the URL. Valid values for partToExtract include HOST, PATH, QUERY, REF, PROTOCOL, AUTHORITY, FILE, and USERINFO. e.g. parse_url('http://facebook.com/path1/p.php?k1=v1&k2=v2#Ref1', 'HOST') returns 'facebook.com'. Also a value of a particular key in QUERY can be extracted by providing the key as the third argument, e.g. parse_url('http://facebook.com/path1/p.php?k1=v1&k2=v2#Ref1', 'QUERY', 'k1') returns 'v1'.

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string

get_json_object(string json_string, string path)

Extract json object from a json string based on json path specified, and return json string of the extracted json object. It will return null if the input json string is invalid. NOTE: The json path can only have the characters [0-9a-z_], i.e., no upper-case or special characters. Also, the keys *cannot start with numbers.* This is due to restrictions on Hive column names.

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string

space(int n)

Return a string of n spaces

string

repeat(string str, int n)

Repeat str n times

int

ascii(string str)

Returns the numeric value of the first character of str

string

lpad(string str, int len, string pad)

Returns str, left-padded with pad to a length of len

string

rpad(string str, int len, string pad)

Returns str, right-padded with pad to a length of len

array

split(string str, string pat)

Split str around pat (pat is a regular expression)

int

find_in_set(string str, string strList)

Returns the first occurance of str in strList where strList is a comma-delimited string. Returns null if either argument is null. Returns 0 if the first argument contains any commas. e.g. find_in_set('ab', 'abc,b,ab,c,def') returns 3

array<array<string>>

sentences(string str, string lang, string locale)

Tokenizes a string of natural language text into words and sentences, where each sentence is broken at the appropriate sentence boundary and returned as an array of words. The 'lang' and 'locale' are optional arguments. e.g. sentences('Hello there! How are you?') returns ( ("Hello", "there"), ("How", "are", "you") )

array<struct<string,double>>

ngrams(array<array<string>>, int N, int K, int pf)

Returns the top-k N-grams from a set of tokenized sentences, such as those returned by the sentences() UDAF. See StatisticsAndDataMining for more information.

array<struct<string,double>>

context_ngrams(array<array<string>>, array<string>, int K, int pf)

Returns the top-k contextual N-grams from a set of tokenized sentences, given a string of "context". See StatisticsAndDataMining for more information.

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bigint

count(*), count(expr), count(DISTINCT expr[, expr_.])

count(*) - Returns the total number of retrieved rows, including rows containing NULL values; count(expr) - Returns the number of rows for which the supplied expression is non-NULL; count(DISTINCT expr[, expr]) - Returns the number of rows for which the supplied expression(s) are unique and non-NULL.

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double

sum(col), sum(DISTINCT col)

Returns the sum of the elements in the group or the sum of the distinct values of the column in the group

double

avg(col), avg(DISTINCT col)

Returns the average of the elements in the group or the average of the distinct values of the column in the group

double

min(col)

Returns the minimum of the column in the group

double

max(col)

Returns the maximum value of the column in the group

double

var_pop(col)

Returns the variance of a numeric column in the group

double

var_samp(col)

Returns the unbiased sample variance of a numeric column in the group

double

stddev_pop(col)

Returns the standard deviation of a numeric column in the group

double

stddev_samp(col)

Returns the unbiased sample standard deviation of a numeric column in the group

double

covar_pop(col1, col2)

Returns the population covariance of a pair of numeric columns in the group

double

covar_samp(col1, col2)

Returns the sample covariance of a pair of a numeric columns in the group

double

corr(col1, col2)

Returns the Pearson coefficient of correlation of a pair of a numeric columns in the group

double

percentile(BIGINT col, p)

Returns the exact p^th percentile of a column in the group (does not work with floating point types). p must be between 0 and 1. NOTE: A true percentile can only be computed for integer values. Use PERCENTILE_APPROX if your input is non-integral.

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array<double>

percentile(BIGINT col, array(p₁ [, p₂]...))

Returns the exact percentiles p₁, p₂, ... of a column in the group (does not work with floating point types). p_i must be between 0 and 1. NOTE: A true percentile can only be computed for integer values. Use PERCENTILE_APPROX if your input is non-integral.

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double

percentile_approx(DOUBLE col, p [, B])

Returns an approximate p^th percentile of a numeric column (including floating point types) in the group. The B parameter controls approximation accuracy at the cost of memory. Higher values yield better approximations, and the default is 10,000. When the number of distinct values in col is smaller than B, this gives an exact percentile value.

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array<double>

percentile_approx(DOUBLE col, array(p₁ [, p₂]...) [, B])

Same as above, but accepts and returns an array of percentile values instead of a single one.

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array<struct {'x','y'}>

histogram_numeric(col, b)

Computes a histogram of a numeric column in the group using b non-uniformly spaced bins. The output is an array of size b of double-valued (x,y) coordinates that represent the bin centers and heights

array

collect_set(col)

Returns a set of objects with duplicate elements eliminated

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[1,2,3]

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[4,5,6]

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