2. 程式人生 > >hive內建函式大全

hive內建函式大全

阿新 • • 發佈：2019-02-14

一、檢視函式

        show functions 顯示hive下內建所有函式

        desc function extended add_months 顯示add_months 函式用法

二、按首字母排序

    hive版本1.1.0-cdh5.7.0.

函式 Usage 舉例
! ! a - Logical not No example for !.
% a % b - Returns the remainder when dividing a by b. No example for %.
& a & b - Bitwise AND. SELECT 3 & 5; 1
*  a * b - Multiplies a by b. No example for *.
+ a + b - Returns a+b. No example for +.
- a - b - Returns a-b. No example for -.
/ a / b - Divides a by b. > SELECT 3 / 2;
 1.5
< a < b - Returns TRUE if a is less than b. No example for <.
<= a <= b - Returns TRUE if a is not greater than b. No example for <=.
<=> a <=> b - Returns same result with EQUAL(=) operator for non-null operands,
 but returns TRUE if both are NULL, FALSE if one of the them is NULL.		 No example for <=>.
= a = b - Returns TRUE if a equals b and false otherwise. No example for =.
==  a == b - Returns TRUE if a equals b and false otherwise. No example for ==.
>  a > b - Returns TRUE if a is greater than b. No example for >.
>= a >= b - Returns TRUE if a is not smaller than b. No example for >=.
^ a ^ b - Bitwise exclusive OR. SELECT 3 ^ 5; 2
 abs abs(expr) - Returns the absolute value of the numeric value > SELECT abs('-1');
 1
acos acos(x) - Returns the arc cosine of x if -1<=x<=1 or NaN otherwise. > SELECT acos(1);
 0.0
> SELECT acos(2);
 NaN
add_months  add_months(start_date, num_months) - Returns the date that is num_months after start_date. > SELECT add_months('2016-08-31', 1);
 '2016-09-30'
and a and b - Logical AND. No example for and.
approx_count_distinct approx_count_distinct(expr) - Returns the estimated cardinality by HyperLogLog++.
 approx_count_distinct(expr, relativeSD=0.05) - Returns the estimated cardinality by HyperLogLog++
 with relativeSD, the maximum estimation error allowed.		 No example for approx_count_distinct.
array array(n0, ...) - Returns an array with the given elements. No example for array.
array_contains array_contains(array, value) - Returns TRUE if the array contains the value.  > SELECT array_contains(array(1, 2, 3), 2);
 true
ascii ascii(str) - Returns the numeric value of the first character of str. > SELECT ascii('222');
 50
> SELECT ascii(2);
 50
asin asin(x) - Returns the arc sin of x if -1<=x<=1 or NaN otherwise. > SELECT asin(0);
 0.0
> SELECT asin(2);
 NaN
assert_true assert_true(condition) - Throw an exception if 'condition' is not true. No example for assert_true.
atan  atan(x) - Returns the arc tangent. > SELECT atan(0);
 0.0
atan2 atan2(x,y) - Returns the arc tangent2. > SELECT atan2(0, 0);
 0.0
avg avg(x) - Returns the mean calculated from values of a group. No example for avg.
base64 base64(bin) - Convert the argument from binary to a base 64 string. No example for base64.
bin bin(x) - Returns x in binary. > SELECT bin(13);
 '1101'
bround  bround(x, d) - Round x to d decimal places using HALF_EVEN rounding mode. > SELECT bround(2.5, 0);
 2.0
cbrt cbrt(x) - Returns the cube root of a double value. > SELECT cbrt(27.0);
 3.0
ceil ceil(x) - Returns the smallest integer not smaller than x. > SELECT ceil(-0.1);
 0
> SELECT ceil(5);
 5
ceiling ceiling(x) - Returns the smallest integer not smaller than x. > SELECT ceiling(-0.1);
 0
> SELECT ceiling(5);
 5
coalesce coalesce(a1, a2, ...) - Returns the first non-null argument if exists. Otherwise, NULL.  SELECT coalesce(NULL, 1, NULL);
 1
collect_list collect_list(expr) - Collects and returns a list of non-unique elements. No example for collect_list.
collect_set collect_set(expr) - Collects and returns a set of unique elements. No example for collect_set.
concat  concat(str1, str2, ..., strN) - Returns the concatenation of str1, str2, ..., strN SELECT concat('Spark','SQL');
 'SparkSQL'
concat_ws concat_ws(sep, [str | array(str)]+) - Returns the concatenation of the strings separated by sep. > SELECT concat_ws(' ', Spark', 'SQL');
 'Spark SQL'
conv  conv(num, from_base, to_base) - Convert num from from_base to to_base. > SELECT conv('100', 2, 10);
 '4'
> SELECT conv(-10, 16, -10);
 '16'
corr corr(x,y) - Returns Pearson coefficient of correlation between a set of number pairs. No example for corr.
cos cos(x) - Returns the cosine of x. > SELECT cos(0);
 1.0
cosh cosh(x) - Returns the hyperbolic cosine of x. > SELECT cosh(0);
 1.0
count  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		 No example for count.
covar_pop covar_pop(x,y) - Returns the population covariance of a set of number pairs. No example for covar_pop.
covar_samp covar_samp(x,y) - Returns the sample covariance of a set of number pairs. No example for covar_samp.
crc32 crc32(input) - Returns a cyclic redundancy check value as a bigint of the input > SELECT crc32('Spark');
 '1557323817'
cube  N/A.  N/A.
cume_dist cume_dist() - The CUME_DIST() function computes the position of a value relative to
 a all values in the partition.		 No example for cume_dist.
current_database current_database() - Returns the current database. > SELECT current_database()
current_date  current_date() - Returns the current date at the start of query evaluation. No example for current_date.
current_timestamp current_timestamp() - Returns the current timestamp at the start of query evaluation. No example for current_timestamp.
date_add date_add(start_date, num_days) - Returns the date that is num_days after start_date. > SELECT date_add('2016-07-30', 1);
 '2016-07-31'
date_format date_format(date/timestamp/string, fmt) - Converts a date/timestamp/string to a value of string in the format specified by the date format fmt. > SELECT date_format('2016-04-08', 'y')
 '2016'
date_sub date_sub(start_date, num_days) - Returns the date that is num_days before start_date. > SELECT date_sub('2016-07-30', 1);
 '2016-07-29'
datediff datediff(date1, date2) - Returns the number of days between date1 and date2. > SELECT datediff('2009-07-30', '2009-07-31');
 1
day day(param) - Returns the day of month of date/timestamp, or the day of interval. > SELECT day('2009-07-30');
 30
dayofmonth dayofmonth(param) - Returns the day of month of date/timestamp, or the day of interval. > SELECT dayofmonth('2009-07-30');
 30
dayofyear dayofyear(param) - Returns the day of year of date/timestamp. > SELECT dayofyear('2016-04-09');
 100
decode decode(bin, str) - Decode the first argument using the second argument character set. No example for decode.
degrees degrees(x) - Converts radians to degrees. > SELECT degrees(3.141592653589793);
 180.0
dense_rank dense_rank() - The DENSE_RANK() function computes the rank of a value in a group of
 values. The result is one plus the previously assigned rank value. Unlike Rank,
 DenseRank will not produce gaps in the ranking sequence.		 No example for dense_rank.
e  e() - Returns Euler's number, E. > SELECT e();
 2.718281828459045
elt elt(n, str1, str2, ...) - returns the n-th string, e.g. returns str2 when n is 2 > SELECT elt(1, 'scala', 'java') FROM src LIMIT 1;
'scala'
encode encode(str, str) - Encode the first argument using the second argument character set No example for encode.
exp exp(x) - Returns e to the power of x. > SELECT exp(0);
 1.0
explode explode(a) - Separates the elements of array a into multiple rows, or the elements of map a into multiple rows and columns.
Extended Usage:
> SELECT explode(array(10,20));
 10
 20		 > SELECT explode(array(10,20));
 10
 20
expm1 expm1(x) - Returns exp(x) - 1. > SELECT expm1(0);
 0.0
factorial factorial(n) - Returns n factorial for n is [0..20]. Otherwise, NULL. > SELECT factorial(5);
 120
find_in_set find_in_set(str, str_array) - Returns the index (1-based) of the given string (left) in the comma-delimited list (right).
 Returns 0, if the string wasn't found or if the given string (left) contains a comma.		 > SELECT find_in_set('ab','abc,b,ab,c,def');
 3
first first(expr) - Returns the first value of `child` for a group of rows.
 first(expr,isIgnoreNull=false) - Returns the first value of `child` for a group of rows.
 If isIgnoreNull is true, returns only non-null values.		 No example for first.
first_value first_value(expr) - Returns the first value of `child` for a group of rows.
 first_value(expr,isIgnoreNull=false) - Returns the first value of `child` for a group of rows.
 If isIgnoreNull is true, returns only non-null values.		 No example for first_value.
floor floor(x) - Returns the largest integer not greater than x. > SELECT floor(-0.1);
 -1
> SELECT floor(5);
 5
format_number format_number(X, D) - Formats the number X like '#,###,###.##', rounded to D decimal places.
 If D is 0, the result has no decimal point or fractional part.
 This is supposed to function like MySQL's FORMAT.		 > SELECT format_number(12332.123456, 4);
 '12,332.1235'
format_string format_string(String format, Obj... args) - Returns a formatted string from printf-style format strings. > SELECT format_string("Hello World %d %s", 100, "days");
 'Hello World 100 days'
from_unixtime from_unixtime(unix_time, format) - Returns unix_time in the specified format > SELECT from_unixtime(0, 'yyyy-MM-dd HH:mm:ss');
 '1970-01-01 00:00:00'
from_utc_timestamp  from_utc_timestamp(timestamp, string timezone) - Assumes given timestamp is UTC and converts to given timezone. No example for from_utc_timestamp.
get_json_object get_json_object(json_txt, path) - Extract a json object from path No example for get_json_object.
greatest greatest(n1, ...) - Returns the greatest value of all parameters, skipping null values. No example for greatest.
grouping N/A. N/A.
grouping_id N/A. N/A.
hash hash(a1, a2, ...) - Returns a hash value of the arguments. No example for hash.
hex hex(x) - Convert the argument to hexadecimal. > SELECT hex(17);
 '11'
> SELECT hex('Spark SQL');
 '537061726B2053514C'
hour hour(param) - Returns the hour component of the string/timestamp/interval. > SELECT hour('2009-07-30 12:58:59');
 12
hypot hypot(a, b) - Returns sqrt(a**2 + b**2). > SELECT hypot(3, 4);
 5.0
if  if(expr1,expr2,expr3) - If expr1 is TRUE then IF() returns expr2; otherwise it returns expr3. No example for if.
ifnull  ifnull(a,b) - Returns b if a is null, or a otherwise. No example for ifnull.
in expr in(val1, val2, ...) - Returns true if expr equals to any valN. No example for in.
initcap initcap(str) - Returns str with the first letter of each word in uppercase.
 All other letters are in lowercase. Words are delimited by white space.		 > SELECT initcap('sPark sql');
 'Spark Sql'
inline inline(a) - Explodes an array of structs into a table. > SELECT inline(array(struct(1, 'a'), struct(2, 'b')));
 [1,a]
 [2,b]
input_file_name input_file_name() - Returns the name of the current file being read if available > SELECT input_file_name();
 ''
instr instr(str, substr) - Returns the (1-based) index of the first occurrence of substr in str. > SELECT instr('SparkSQL', 'SQL');
 6
isnan isnan(a) - Returns true if a is NaN and false otherwise. No example for isnan.
isnotnull isnotnull(a) - Returns true if a is not NULL and false otherwise. No example for isnotnull.
isnull isnull(a) - Returns true if a is NULL and false otherwise. No example for isnull.
json_tuple json_tuple(jsonStr, p1, p2, ..., pn) - like get_json_object, but it takes multiple names and return a tuple. All the input parameters and output column types are string. No example for json_tuple.
kurtosis kurtosis(x) - Returns the Kurtosis value calculated from values of a group. No example for kurtosis.
lag lag(input, offset, default) - LAG returns the value of 'x' at 'offset' rows
 before the current row in the window		 No example for lag.
last last(expr,isIgnoreNull) - Returns the last value of `child` for a group of rows. No example for last.
last_day last_day(date) - Returns the last day of the month which the date belongs to. > SELECT last_day('2009-01-12');
 '2009-01-31'
last_value last_value(expr,isIgnoreNull) - Returns the last value of `child` for a group of rows. No example for last_value.
lcase lcase(str) - Returns str with all characters changed to lowercase > SELECT lcase('SparkSql');
 'sparksql'
lead lead(input, offset, default) - LEAD returns the value of 'x' at 'offset' rows
 after the current row in the window		 No example for lead.
least least(n1, ...) - Returns the least value of all parameters, skipping null values. No example for least.
length  length(str | binary) - Returns the length of str or number of bytes in binary data. > SELECT length('Spark SQL');
 9
levenshtein levenshtein(str1, str2) - Returns the Levenshtein distance between the two given strings. > SELECT levenshtein('kitten', 'sitting');
 3
like str like pattern - Returns true if str matches pattern and false otherwise. No example for like.
ln ln(x) - Returns the natural logarithm of x with base e. > SELECT ln(1);
 0.0
locate locate(substr, str[, pos]) - Returns the position of the first occurrence of substr in str after position pos.
 The given pos and return value are 1-based.		 > SELECT locate('bar', 'foobarbar', 5);
 7
log log(b, x) - Returns the logarithm of x with base b. > SELECT log(10, 100);
 2.0
log10 log10(x) - Returns the logarithm of x with base 10. > SELECT log10(10);
 1.0
log1p log1p(x) - Returns log(1 + x). > SELECT log1p(0);
 0.0
log2 log2(x) - Returns the logarithm of x with base 2. > SELECT log2(2);
 1.0
lower lower(str) - Returns str with all characters changed to lowercase > SELECT lower('SparkSql');
 'sparksql'
lpad lpad(str, len, 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.		 > SELECT lpad('hi', 5, '??');
 '???hi'
> SELECT lpad('hi', 1, '??');
 'h'
ltrim  ltrim(str) - Removes the leading space characters from str. > SELECT ltrim(' SparkSQL ');
 'SparkSQL '
map map(key0, value0, key1, value1...) - Creates a map with the given key/value pairs. No example for map.
map_keys map_keys(map) - Returns an unordered array containing the keys of the map. > SELECT map_keys(map(1, 'a', 2, 'b'));
 [1,2]
map_values map_values(map) - Returns an unordered array containing the values of the map.  > SELECT map_values(map(1, 'a', 2, 'b'));
 ["a","b"]
max max(expr) - Returns the maximum value of expr. No example for max.
md5 md5(input) - Returns an MD5 128-bit checksum as a hex string of the input > SELECT md5('Spark');
 '8cde774d6f7333752ed72cacddb05126'
mean mean(x) - Returns the mean calculated from values of a group. No example for mean.
min min(expr) - Returns the minimum value of expr. No example for min.
minute minute(param) - Returns the minute component of the string/timestamp/interval. > SELECT minute('2009-07-30 12:58:59');
 58
monotonically_increasing_id monotonically_increasing_id() - Returns monotonically increasing 64-bit integers.
 The generated ID is guaranteed to be monotonically increasing and unique, but not consecutive.
 The current implementation puts the partition ID in the upper 31 bits, and the lower 33 bits
 represent the record number within each partition. The assumption is that the data frame has
 less than 1 billion partitions, and each partition has less than 8 billion records.		 > SELECT monotonically_increasing_id();
 0
month month(param) - Returns the month component of the date/timestamp/interval > SELECT month('2016-07-30');
 7
months_between months_between(date1, date2) - returns number of months between dates date1 and date2. > SELECT months_between('1997-02-28 10:30:00', '1996-10-30');
 3.94959677
named_struct named_struct(name1, val1, name2, val2, ...) - Creates a struct with the given field names and values. No example for named_struct.
nanvl nanvl(a,b) - Returns a iff it's not NaN, or b otherwise. No example for nanvl.
negative negative(a) - Returns -a. No example for negative.
next_day  next_day(start_date, day_of_week) - Returns the first date which is later than start_date and named as indicated. > SELECT next_day('2015-01-14', 'TU');
 '2015-01-20'
not not a - Logical not No example for not.
now now() - Returns the current timestamp at the start of query evaluation. >select now();1521529756611
ntile ntile(x) - The NTILE(n) function divides the rows for each window partition
 into 'n' buckets ranging from 1 to at most 'n'.		 No example for ntile.
nullif nullif(a,b) - Returns null if a equals to b, or a otherwise. No example for nullif.
nvl nvl(a,b) - Returns b if a is null, or a otherwise. No example for nvl.
nvl2 nvl2(a,b,c) - Returns b if a is not null, or c otherwise. No example for nvl2.
or a or b - Logical OR. No example for or.
parse_url parse_url(url, partToExtract[, key]) - extracts a part from a URL Parts: HOST, PATH, QUERY, REF, PROTOCOL, AUTHORITY, FILE, USERINFO.
 Key specifies which query to extract.  Examples:
 > SELECT parse_url('http://spark.apache.org/path?query=1', 'HOST')
 'spark.apache.org'
 > SELECT parse_url('http://spark.apache.org/path?query=1', 'QUERY')
 'query=1'
 > SELECT parse_url('http://spark.apache.org/path?query=1', 'QUERY', 'query')
 '1'
percent_rank percent_rank() - PERCENT_RANK() The PercentRank function computes the percentage
 ranking of a value in a group of values.		 No example for percent_rank.
pi pi() - Returns PI. > SELECT pi();
 3.141592653589793
pmod pmod(a, b) - Returns the positive modulo > SELECT pmod(10,3);
 1
posexplode posexplode(a) - Separates the elements of array a into multiple rows with positions, or the elements of a map into multiple rows and columns with positions.
Extended Usage:
> SELECT posexplode(array(10,20));
 0 10
 1 20		 > SELECT posexplode(array(10,20));
 0 10
 1 20
positive positive(a) - Returns a. No example for positive.
pow pow(x1, x2) - Raise x1 to the power of x2. > SELECT pow(2, 3);
 8.0
power power(x1, x2) - Raise x1 to the power of x2. > SELECT power(2, 3);
 8.0
printf printf(String format, Obj... args) - Returns a formatted string from printf-style format strings. > SELECT printf("Hello World %d %s", 100, "days");
 'Hello World 100 days'
quarter quarter(param) - Returns the quarter of the year for date, in the range 1 to 4. No example for quarter.
radians radians(x) - Converts degrees to radians. > SELECT radians(180);
 3.141592653589793
rand rand(a) - Returns a random column with i.i.d. uniformly distributed values in [0, 1). No example for rand.
randn randn(a) - Returns a random column with i.i.d. gaussian random distribution. No example for randn.
rank rank() - RANK() computes the rank of a value in a group of values. The result
 is one plus the number of rows preceding or equal to the current row in the
 ordering of the partition. Tie values will produce gaps in the sequence.		 No example for rank.
regexp_extract  regexp_extract(str, regexp[, idx]) - extracts a group that matches regexp. > SELECT regexp_extract('100-200', '(\d+)-(\d+)', 1);
 '100'
regexp_replace regexp_replace(str, regexp, rep) - replace all substrings of str that match regexp with rep. > SELECT regexp_replace('100-200', '(\d+)', 'num');
 'num-num'
repeat repeat(str, n) - Returns the string which repeat the given string value n times. > SELECT repeat('123', 2);
 '123123'
reverse reverse(str) - Returns the reversed given string. > SELECT reverse('Spark SQL');
 'LQS krapS'
rint > SELECT rint(12.3456, 1);
 12.3		 rint(x, d) - Return the rounded x at d decimal places.
rlike  str rlike regexp - Returns true if str matches regexp and false otherwise. No example for rlike.
rollup N/A. N/A.
round  round(x, d) - Round x to d decimal places using HALF_UP rounding mode. > SELECT round(2.5, 0);
 3.0
row_number row_number() - The ROW_NUMBER() function assigns a unique, sequential number to
 each row, starting with one, according to the ordering of rows within
 the window partition.		 No example for row_number.
rpad rpad(str, len, 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.		 > SELECT rpad('hi', 5, '??');
 'hi???'
> SELECT rpad('hi', 1, '??');
 'h'
rtrim rtrim(str) - Removes the trailing space characters from str. > SELECT rtrim(' SparkSQL ');
 ' SparkSQL'
second second(param) - Returns the second component of the string/timestamp/interval. > SELECT second('2009-07-30 12:58:59');
 59
sentences sentences(str[, lang, country]) - Splits str into an array of array of words. > SELECT sentences('Hi there! Good morning.');
 [['Hi','there'], ['Good','morning']]
sha sha(input) - Returns a sha1 hash value as a hex string of the input > SELECT sha('Spark');
 '85f5955f4b27a9a4c2aab6ffe5d7189fc298b92c'
sha1 sha1(input) - Returns a sha1 hash value as a hex string of the input > SELECT sha1('Spark');
 '85f5955f4b27a9a4c2aab6ffe5d7189fc298b92c'
sha2 sha2(input, bitLength) - Returns a checksum of SHA-2 family as a hex string of the input.
 SHA-224, SHA-256, SHA-384, and SHA-512 are supported. Bit length of 0 is equivalent to 256.		 > SELECT sha2('Spark', 0);
 '529bc3b07127ecb7e53a4dcf1991d9152c24537d919178022b2c42657f79a26b'
shiftleft shiftleft(a, b) - Bitwise left shift. > SELECT shiftleft(2, 1);
 4
shiftright shiftright(a, b) - Bitwise right shift. > SELECT shiftright(4, 1);
 2
shiftrightunsigned shiftrightunsigned(a, b) - Bitwise unsigned right shift. > SELECT shiftrightunsigned(4, 1);
 2
sign  sign(x) - Returns the sign of x. > SELECT sign(40);
 1.0
signum  signum(x) - Returns the sign of x. > SELECT signum(40);
 1.0
sin sin(x) - Returns the sine of x. > SELECT sin(0);
 0.0
sinh sinh(x) - Returns the hyperbolic sine of x. > SELECT sinh(0);
 0.0
size  size(expr) - Returns the size of an array or a map.  > SELECT size(array('b', 'd', 'c', 'a'));
 4
skewness skewness(x) - Returns the Skewness value calculated from values of a group. No example for skewness.
sort_array sort_array(array(obj1, obj2, ...), ascendingOrder) - Sorts the input array in ascending order according to the natural ordering of the array elements.
Extended Usage:
 > SELECT sort_array(array('b', 'd', 'c', 'a'), true);
 'a', 'b', 'c', 'd'		 > SELECT sort_array(array('b', 'd', 'c', 'a'), true);
 'a', 'b', 'c', 'd'
soundex soundex(str) - Returns soundex code of the string. > SELECT soundex('Miller');
 'M460'
space space(n) - Returns a n spaces string. > SELECT space(2);
 ' '
spark_partition_id spark_partition_id() - Returns the current partition id of the Spark task > SELECT spark_partition_id();
 0
split split(str, regex) - Splits str around occurrences that match regex > SELECT split('oneAtwoBthreeC', '[ABC]');
 ['one', 'two', 'three']
sqrt sqrt(x) - Returns the square root of x. > SELECT sqrt(4);
 2.0
stack stack(n, v1, ..., vk) - Separate v1, ..., vk into n rows. > SELECT stack(2, 1, 2, 3);
 [1,2]
 [3,null]
std std(x) - Returns the sample standard deviation calculated from values of a group. No example for std.
stddev stddev(x) - Returns the sample standard deviation calculated from values of a group. No example for stddev.
stddev_pop stddev_pop(x) - Returns the population standard deviation calculated from values of a group. No example for stddev_pop.
stddev_samp stddev_samp(x) - Returns the sample standard deviation calculated from values of a group. No example for stddev_samp.
struct struct(col1, col2, col3, ...) - Creates a struct with the given field values. No example for struct.
substr substr(str, pos[, len]) - Returns the substring of str that starts at pos and is of length len or the slice of byte array that starts at pos and is of length len. > SELECT substr('Spark SQL', 5);
 'k SQL'
> SELECT substr('Spark SQL', -3);
 'SQL'
> SELECT substr('Spark SQL', 5, 1);
 'k'
substring substring(str, pos[, len]) - Returns the substring of str that starts at pos and is of length len or the slice of byte array that starts at pos and is of length len. > SELECT substring('Spark SQL', 5);
 'k SQL'
> SELECT substring('Spark SQL', -3);
 'SQL'
> SELECT substring('Spark SQL', 5, 1);
 'k'
substring_index substring_index(str, delim, count) - Returns the substring from str before count occurrences of the delimiter delim.
 If count is positive, everything to the left of the final delimiter (counting from the
 left) is returned. If count is negative, everything to the right of the final delimiter
 (counting from the right) is returned. Substring_index performs a case-sensitive match
 when searching for delim.		 SELECT substring_index('www.apache.org', '.', 2);
 'www.apache'
sum sum(x) - Returns the sum calculated from values of a group. No example for sum.
tan tan(x) - Returns the tangent of x. > SELECT tan(0);
 0.0
tanh tanh(x) - Returns the hyperbolic tangent of x. > SELECT tanh(0);
 0.0
to_date to_date(expr) - Extracts the date part of the date or datetime expression expr. > SELECT to_date('2009-07-30 04:17:52');
 '2009-07-30'
to_unix_timestamp to_unix_timestamp(date[, pattern]) - Returns the UNIX timestamp of the give time. No example for to_unix_timestamp.
to_utc_timestamp to_utc_timestamp(timestamp, string timezone) - Assumes given timestamp is in given timezone and converts to UTC. to_utc_timestamp(timestamp, string timezone) - Assumes given timestamp is in given timezone and converts to UTC.
translate translate(input, from, to) - Translates the input string by replacing the characters present in the from string with the corresponding characters in the to string > SELECT translate('AaBbCc', 'abc', '123');
 'A1B2C3'
trim trim(str) - Removes the leading and trailing space characters from str. > SELECT trim(' SparkSQL ');
 'SparkSQL'
trunc trunc(date, fmt) - Returns returns date with the time portion of the day truncated to the unit specified by the format model fmt. > SELECT trunc('2009-02-12', 'MM')
 '2009-02-01'
> SELECT trunc('2015-10-27', 'YEAR');
 '2015-01-01'
ucase ucase(str) - Returns str with all characters changed to uppercase > SELECT ucase('SparkSql');
 'SPARKSQL'
unbase64 unbase64(str) - Convert the argument from a base 64 string to binary. No example for unbase64.
unhex unhex(x) - Converts hexadecimal argument to binary. > SELECT decode(unhex('537061726B2053514C'),'UTF-8');
 'Spark SQL'
unix_timestamp unix_timestamp([date[, pattern]]) - Returns the UNIX timestamp of current or specified time. No example for unix_timestamp.
upper upper(str) - Returns str with all characters changed to uppercase > SELECT upper('SparkSql');
 'SPARKSQL'
var_pop var_pop(x) - Returns the population variance calculated from values of a group. No example for var_pop.
var_samp  var_samp(x) - Returns the sample variance calculated from values of a group. No example for var_samp.
variance variance(x) - Returns the sample variance calculated from values of a group. No example for variance.
weekofyear weekofyear(param) - Returns the week of the year of the given date. > SELECT weekofyear('2008-02-20');
 8
when  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. No example for when.
window N/A. N/A.
xpath xpath(xml, xpath) - Returns a string array of values within xml nodes that match the xpath expression > SELECT xpath('<a><b>b1</b><b>b2</b><b>b3</b><c>c1</c><c>c2</c></a>','a/b/text()');
['b1','b2','b3']
xpath_boolean xpath_boolean(xml, xpath) - Evaluates a boolean xpath expression. > SELECT xpath_boolean('<a><b>1</b></a>','a/b');
true
xpath_double  xpath_double(xml, xpath) - Returns a double value that matches the xpath expression > SELECT xpath_double('<a><b>1</b><b>2</b></a>','sum(a/b)');
3.0
xpath_float xpath_float(xml, xpath) - Returns a float value that matches the xpath expression > SELECT xpath_float('<a><b>1</b><b>2</b></a>','sum(a/b)');
3.0
xpath_int  xpath_int(xml, xpath) - Returns an integer value that matches the xpath expression > SELECT xpath_int('<a><b>1</b><b>2</b></a>','sum(a/b)');
3
xpath_long xpath_long(xml, xpath) - Returns a long value that matches the xpath expression > SELECT xpath_long('<a><b>1</b><b>2</b></a>','sum(a/b)');
3
xpath_number xpath_number(xml, xpath) - Returns a double value that matches the xpath expression > SELECT xpath_number('<a><b>1</b><b>2</b></a>','sum(a/b)');
3.0
xpath_short xpath_short(xml, xpath) - Returns a short value that matches the xpath expression > SELECT xpath_short('<a><b>1</b><b>2</b></a>','sum(a/b)');
3
xpath_string xpath_string(xml, xpath) - Returns the text contents of the first xml node that matches the xpath expression > SELECT xpath_string('<a><b>b</b><c>cc</c></a>','a/c');
cc
year year(param) - Returns the year component of the date/timestamp/interval. > SELECT year('2016-07-30');
 2016
| a | b - Bitwise OR. > SELECT 3 | 5; 7
~ ~ b - Bitwise NOT. > SELECT ~ 0; -1

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