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int

ascii(string str)

Returns the numeric value of the first character of str.

UDFAscii

string

base64(binary bin)

Converts the argument from binary to a base64string.

UDFBase64

character_length(string str)

chr(bigint|double A)

string

concat(string|binary A,string|binary B...)

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

GenericUDFConcat

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.

GenericUDAFContextNGrams

string

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

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

GenericUDFConcatWS

string

concat_ws(string SEP, array<string>)

Like concat_ws() above, but taking an array ofstrings.

string

decode(binary bin, string charset)

Decodes the first argument into a string using the provided character set (one of 'US-ASCII', 'ISO-8859-1', 'UTF-8', 'UTF-16BE', 'UTF-16LE', 'UTF-16'). If either argument is null, the result will also be null.

GenericUDFDecode

elt(N int, str1 string, str2s tring, str3 string,...)

Return string at index number. For example elt(2,'hello','world') returns 'world'. Returns NULL if N is less than 1 or greater than the number of arguments.

GenericUDFElt

binary

encode(string src, string charset)

Encodes the first argument into a BINARY using the provided character set (one of 'US-ASCII', 'ISO-8859-1', 'UTF-8', 'UTF-16BE', 'UTF-16LE', 'UTF-16'). If either argument is null, the result will also be null. 

GenericUDFEncode

field(val T, val1 T, val2 T, val3 T,...) 

Returns the index of val in the val1,val2,val3,... list or 0 if not found. For example field('world','say','hello','world') returns 3.
All primitive types are supported, arguments are compared using str.equals(x). If val is NULL, the return value is 0.

GenericUDFField

int

find_in_set(string str, string strList)

Returns the first occurrence 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. For example, find_in_set('ab', 'abc,b,ab,c,def') returns 3.

UDFFindInSet

string

format_number(number x, int d)

Formats the number X to a format like '#,###,###.##', rounded to D decimal places, and returns the result as a string. If D is 0, the result has no decimal point or fractional part.

GenericUDFFormatNumber

string

get_json_object(string json_string,string path)

boolean

in_file(string str, string filename)

Returns true if the string str appears as an entire line in filename.

GenericUDFInFile

int

instr(string str, string substr)

Returns the position of the first occurrence of substr in str. Returns null if either of the arguments are null and returns 0 if substr could not be found in str. Be aware that this is not zero-based. The first character in str has index 1.

GenericUDFInstr

int

length(string A)

Returns the length of the string.

GenericUDFLength

int

locate(string substr,string str[,int pos])

Returns the position of the first occurrence of substr in str after position pos.

GenericUDFLocate

string

lower(string A) lcase(string A)

Returns the string resulting from converting all characters of B to lowercase. For example, lower('fOoBaR') results in 'foobar'.

GenericUDFLower

string

lpad(string str,int len,string pad)

Returns str, left-padded with pad to a length of len. If str is longer than len, the return value is shortened to len characters. In the case of an empty padstring, the return value is null.

GenericUDFLpad

string

ltrim(string A)

Returns the string resulting from trimming spaces from the beginning(left-hand side) of A. For example, ltrim(' foobar ') results in 'foobar '.

GenericUDFLTrim

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.

GenericUDAFnGrams

octet_length(string str)

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. For example, 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, for example, parse_url('http://facebook.com/path1/p.php?k1=v1&k2=v2#Ref1', 'QUERY', 'k1') returns 'v1'.

UDFParseUrl

string

printf(string format, Obj... args)

Returns the input formatted according to printf-style formatstrings.

GenericUDFPrintf

quote(string text)

string

regexp_extract(string subject, string pattern, int index)

Returns the string extracted using the pattern. For example, 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. 

UDFRegExpExtract

string

regexp_replace(string INITIAL_STRING, string PATTERN, string REPLACEMENT)

Returns the string resulting from replacing all substrings in INITIAL_STRING that match the java regular expression syntax defined in PATTERN with instances of REPLACEMENT. For example, 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.

UDFRegExpReplace

string

repeat(string str, int n)

Repeats str in n times.

UDFRepeat

replace(string A, string OLD, string NEW)

string

reverse(string A)

Returns the reversed string.

UDFReverse

string

rpad(string str,int len,string pad)

Returns str, right-padded with pad to a length of len. If str is longer than len, the return value is shortened to len characters. In case of empty padstring, the return value is null.

GenericUDFRpad

string

rtrim(string A)

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

GenericUDFRTrim

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. For example, sentences('Hello there! How are you?') returns ( ("Hello", "there"), ("How", "are", "you") ).

GenericUDFSentences

string

space(int n)

Returns a string of n spaces.

UDFSpace

array

split(string str, string pat)

Splits str around pat (pat is a regular expression).

GenericUDFSplit

map<string,string>

str_to_map(text[, delimiter1, delimiter2])

Splits text into key-value pairs using two delimiters. Delimiter1 separates text into K-V pairs, and Delimiter2 splits each K-V pair. Default delimiters are ',' for delimiter1 and ':' for delimiter2.

GenericUDFStringToMap

string

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

Returns the substring or slice of the byte array of A starting from start position till the end of string A. For example, substr('foobar', 4) results in 'bar'.

GenericUDFSubstringIndex

string

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

Returns the substring or slice of the byte array of A starting from start position with length len. For example, substr('foobar', 4, 1) results in 'b'.

substring_index(string A,string delim,int count)

string

translate(string|char|varchar input,string|char|varchar from,string|char|varchar to)

Translates the input string by replacing the characters present in the fromstring with the corresponding characters in the tostring. This is similar to the translate function in PostgreSQL. If any of the parameters to this UDF are NULL, the result is NULL as well. 

GenericUDFTranslate

string

trim(string A)

Returns the string resulting from trimming spaces from both ends of A. For example, trim(' foobar ') results in 'foobar'

GenericUDFTrim

binary

unbase64(string str)

Converts the argument from a base 64string to BINARY.

UDFUnbase64

string

upper(string A) ucase(string A)

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

GenericUDFUpper

initcap(string A)

levenshtein(string A, string B)

soundex(string A)