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最新spark函数大全

2018-03-07 08:16 211 查看

!

! expr -逻辑非.

%

expr1 % expr2 -在expr1/expr2之后返回剩余的部分
.Examples:
> SELECT 2 % 1.8;
0.2
> SELECT MOD(2, 1.8);
0.2

&
expr1 & expr2 - 返回和expr1和expr2的结果
.Examples:
> SELECT 3 & 5;
1

*
expr1 * expr2 - Returns 
expr1
*
expr2
.Examples:
> SELECT 2 * 3;
6

+
expr1 + expr2 - Returns 
expr1
+
expr2
.Examples:
> SELECT 1 + 2;
3

-
expr1 - expr2 - Returns 
expr1
-
expr2
.Examples:
> SELECT 2 - 1;
1

/
expr1/expr2返回expr1/expr2。它总是执行浮点分。Examples:
> SELECT 3 / 2;
1.5
> SELECT 2L / 2L;
1.0

<
expr1 < expr2 - 如果expr1小于expr2，则返回true。
.Arguments:expr1, expr2 - 这两个表达式必须是相同类型的，或者可以被一个普通类型的类型所使用，并且必须是一个可以被排序的类型。例如，映射类型不是可排序的，因此它不受支持。对于复杂类型的数组/结构体，字段的数据类型必须是可排序的.
Examples:
> SELECT 1 < 2;
true
> SELECT 1.1 < '1';
false
> SELECT to_date('2009-07-30 04:17:52') < to_date('2009-07-30 04:17:52');
false
> SELECT to_date('2009-07-30 04:17:52') < to_date('2009-08-01 04:17:52');
true
> SELECT 1 < NULL;
NULL

<=
expr1 <= expr2 - 如果expr1小于或等于expr2，则返回true
.Examples:
> SELECT 2 <= 2;
true
> SELECT 1.0 <= '1';
true
> SELECT to_date('2009-07-30 04:17:52') <= to_date('2009-07-30 04:17:52');
true
> SELECT to_date('2009-07-30 04:17:52') <= to_date('2009-08-01 04:17:52');
true
> SELECT 1 <= NULL;
NULL

<=>
expr1 <=> expr2 - 返回与非空操作数相等的（=）操作符相同的结果，但如果两者都是null，则返回true，如果其中一个为null，则返回false.
Examples:
> SELECT 2 <=> 2;
true
> SELECT 1 <=> '1';
true
> SELECT true <=> NULL;
false
> SELECT NULL <=> NULL;
true

=
expr1 = expr2 - 如果expr1等于expr2，则返回true，否则将返回false。
Examples:
> SELECT 2 = 2;
true
> SELECT 1 = '1';
true
> SELECT true = NULL;
NULL
> SELECT NULL = NULL;
NULL

==
expr1 == expr2 - 如果expr1等于expr2，则返回true，否则返回false.
Examples:
> SELECT 2 == 2;
true
> SELECT 1 == '1';
true
> SELECT true == NULL;
NULL
> SELECT NULL == NULL;
NULL

>
expr1 > expr2 - 如果expr1大于expr2，则返回true。 Examples:
> SELECT 2 > 1;
true
> SELECT 2 > '1.1';
true
> SELECT to_date('2009-07-30 04:17:52') > to_date('2009-07-30 04:17:52');
false
> SELECT to_date('2009-07-30 04:17:52') > to_date('2009-08-01 04:17:52');
false
> SELECT 1 > NULL;
NULL

>=
expr1 >= expr2 - 如果expr1大于或等于expr2，则返回true
.
Examples:
> SELECT 2 >= 1;
true
> SELECT 2.0 >= '2.1';
false
> SELECT to_date('2009-07-30 04:17:52') >= to_date('2009-07-30 04:17:52');
true
> SELECT to_date('2009-07-30 04:17:52') >= to_date('2009-08-01 04:17:52');
false
> SELECT 1 >= NULL;
NULL

^
expr1 ^ expr2 -返回位或expr1或expr2的结果
.Examples:
> SELECT 3 ^ 5;
2

abs
abs(expr) - 返回数值的绝对值.Examples:
> SELECT abs(-1);
1

acos
acos(expr) -如果-1小于=expr=1或NaN，则返回expr的反余弦（又称arccos）.Examples:
> SELECT acos(1);
0.0
> SELECT acos(2);
NaN

add_months
add_months(start_date, num_months) -返回开始日期后的num数月的日期
.Examples:
> SELECT add_months('2016-08-31', 1);
2016-09-30
Since: 1.5.0
and
expr1 and expr2 - 逻辑与.
approx_count_distinct
approx_count_distinct(expr[, relativeSD]) - 通过HyperLogLog++返回估计的基数。相对维定义了允许的最大估计误差
approx_percentile
approx_percentile(col, percentage [, accuracy]) - 根据给定百分比返回数值列的近似百分比值。百分比的值必须在0.0和1.0之间。精度参数（默认值:10000）是一个正数值，它控制着近似精度，在内存中。较高的精度能产生更好的精度，1.0/精度是近似的相对误差。当百分比是一个数组时，百分比数组的每个值必须在0.0和1.0之间。在本例中，返回给定百分比数组中列的大约百分比数组。Examples:
> SELECT approx_percentile(10.0, array(0.5, 0.4, 0.1), 100);
[10.0,10.0,10.0]
> SELECT approx_percentile(10.0, 0.5, 100);
10.0

array
array(expr, ...) - 返回带有给定元素的数组.Examples:
> SELECT array(1, 2, 3);
[1,2,3]

array_contains
array_contains(array, value) - Returns true if the array contains the value.Examples:
> SELECT array_contains(array(1, 2, 3), 2);
true

ascii
ascii(str) - Returns the numeric value of the first character of 
str
.Examples:
> SELECT ascii('222');
50
> SELECT ascii(2);
50

asin
asin(expr) - Returns the inverse sine (a.k.a. arcsine) the arc sin of 
expr
 if -1<=
expr
<=1 or NaN otherwise.Examples:
> SELECT asin(0);
0.0
> SELECT asin(2);
NaN

assert_true
assert_true(expr) - Throws an exception if 
expr
 is not true.Examples:
> SELECT assert_true(0 < 1);
NULL

atan
atan(expr) - Returns the inverse tangent (a.k.a. arctangent).Examples:
> SELECT atan(0);
0.0

atan2
atan2(expr1, expr2) - Returns the angle in radians between the positive x-axis of a plane and the point given by the coordinates (
expr1
, 
expr2
).Examples:
> SELECT atan2(0, 0);
0.0

avg
avg(expr) - Returns the mean calculated from values of a group.
base64
base64(bin) - Converts the argument from a binary 
bin
 to a base 64 string.Examples:
> SELECT base64('Spark SQL');
U3BhcmsgU1FM

bigint
bigint(expr) - Casts the value 
expr
 to the target data type 
bigint
.
bin
bin(expr) - Returns the string representation of the long value 
expr
 represented in binary.Examples:
> SELECT bin(13);
1101
> SELECT bin(-13);
1111111111111111111111111111111111111111111111111111111111110011
> SELECT bin(13.3);
1101

binary
binary(expr) - Casts the value 
expr
 to the target data type 
binary
.
bit_length
bit_length(expr) - Returns the bit length of string data or number of bits of binary data.Examples:
> SELECT bit_length('Spark SQL');
72

boolean
boolean(expr) - Casts the value 
expr
 to the target data type 
boolean
.
bround
bround(expr, d) - Returns 
expr
 rounded to 
d
 decimal places using HALF_EVEN rounding mode.Examples:
> SELECT bround(2.5, 0);
2.0

cast
cast(expr AS type) - Casts the value 
expr
 to the target data type 
type
.Examples:
> SELECT cast('10' as int);
10

cbrt
cbrt(expr) - Returns the cube root of 
expr
.Examples:
> SELECT cbrt(27.0);
3.0

ceil
ceil(expr) - Returns the smallest integer not smaller than 
expr
.Examples:
> SELECT ceil(-0.1);
0
> SELECT ceil(5);
5

ceiling
ceiling(expr) - Returns the smallest integer not smaller than 
expr
.Examples:
> SELECT ceiling(-0.1);
0
> SELECT ceiling(5);
5

char
char(expr) - Returns the ASCII character having the binary equivalent to 
expr
. If n is larger than 256 the result is equivalent to chr(n % 256)Examples:
> SELECT char(65);
A

char_length
char_length(expr) - Returns the character length of string data or number of bytes of binary data. The length of string data includes the trailing spaces. The length of binary data includes binary zeros.Examples:
> SELECT char_length('Spark SQL ');
10
> SELECT CHAR_LENGTH('Spark SQL ');
10
> SELECT CHARACTER_LENGTH('Spark SQL ');
10

character_length
character_length(expr) - Returns the character length of string data or number of bytes of binary data. The length of string data includes the trailing spaces. The length of binary data includes binary zeros.Examples:
> SELECT character_length('Spark SQL ');
10
> SELECT CHAR_LENGTH('Spark SQL ');
10
> SELECT CHARACTER_LENGTH('Spark SQL ');
10

chr
chr(expr) - Returns the ASCII character having the binary equivalent to 
expr
. If n is larger than 256 the result is equivalent to chr(n % 256)Examples:
> SELECT chr(65);
A

coalesce
coalesce(expr1, expr2, ...) - Returns the first non-null argument if exists. Otherwise, null.Examples:
> SELECT coalesce(NULL, 1, NULL);
1

collect_list
collect_list(expr) - Collects and returns a list of non-unique elements.
collect_set
collect_set(expr) - Collects and returns a set of unique elements.
concat
concat(str1, str2, ..., strN) - Returns the concatenation of str1, str2, ..., strN.Examples:
> SELECT concat('Spark', 'SQL');
SparkSQL

concat_ws
concat_ws(sep, [str | array(str)]+) - Returns the concatenation of the strings separated by 
sep
.Examples:
> SELECT concat_ws(' ', 'Spark', 'SQL');
Spark SQL

conv
conv(num, from_base, to_base) - Convert 
num
 from 
from_base
 to 
to_base
.Examples:
> SELECT conv('100', 2, 10);
4
> SELECT conv(-10, 16, -10);
-16

corr
corr(expr1, expr2) - Returns Pearson coefficient of correlation between a set of number pairs.
cos
cos(expr) - Returns the cosine of 
expr
.Examples:
> SELECT cos(0);
1.0

cosh
cosh(expr) - Returns the hyperbolic cosine of 
expr
.Examples:
> SELECT cosh(0);
1.0

cot
cot(expr) - Returns the cotangent of 
expr
.Examples:
> SELECT cot(1);
0.6420926159343306

count
count(*) - Returns the total number of retrieved rows, including rows containing null.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.
count_min_sketch
count_min_sketch(col, eps, confidence, seed) - Returns a count-min sketch of a column with the given esp, confidence and seed. The result is an array of bytes, which can be deserialized to a 
CountMinSketch
 before usage. Count-min sketch is a probabilistic data structure used for cardinality estimation using sub-linear space.
covar_pop
covar_pop(expr1, expr2) - Returns the population covariance of a set of number pairs.
covar_samp
covar_samp(expr1, expr2) - Returns the sample covariance of a set of number pairs.
crc32
crc32(expr) - Returns a cyclic redundancy check value of the 
expr
 as a bigint.Examples:
> SELECT crc32('Spark');
1557323817

cube
cume_dist
cume_dist() - Computes the position of a value relative to all values in the partition.
current_database
current_database() - Returns the current database.Examples:
> SELECT current_database();
default

current_date
current_date() - Returns the current date at the start of query evaluation.Since: 1.5.0
current_timestamp
current_timestamp() - Returns the current timestamp at the start of query evaluation.Since: 1.5.0
date
date(expr) - Casts the value 
expr
 to the target data type 
date
.
date_add
date_add(start_date, num_days) - Returns the date that is 
num_days
 after 
start_date
.Examples:
> SELECT date_add('2016-07-30', 1);
2016-07-31
Since: 1.5.0
date_format
date_format(timestamp, fmt) - Converts 
timestamp
 to a value of string in the format specified by the date format 
fmt
.Examples:
> SELECT date_
71190
format('2016-04-08', 'y');
2016
Since: 1.5.0
date_sub
date_sub(start_date, num_days) - Returns the date that is 
num_days
 before 
start_date
.Examples:
> SELECT date_sub('2016-07-30', 1);
2016-07-29
Since: 1.5.0
date_trunc
date_trunc(fmt, ts) - Returns timestamp 
ts
 truncated to the unit specified by the format model 
fmt
. 
fmt
 should be one of ["YEAR", "YYYY", "YY", "MON", "MONTH", "MM", "DAY", "DD", "HOUR", "MINUTE", "SECOND", "WEEK", "QUARTER"]Examples:
> SELECT date_trunc('2015-03-05T09:32:05.359', 'YEAR');
2015-01-01T00:00:00
> SELECT date_trunc('2015-03-05T09:32:05.359', 'MM');
2015-03-01T00:00:00
> SELECT date_trunc('2015-03-05T09:32:05.359', 'DD');
2015-03-05T00:00:00
> SELECT date_trunc('2015-03-05T09:32:05.359', 'HOUR');
2015-03-05T09:00:00
Since: 2.3.0
datediff
datediff(endDate, startDate) - Returns the number of days from 
startDate
 to 
endDate
.Examples:
> SELECT datediff('2009-07-31', '2009-07-30');
1

> SELECT datediff('2009-07-30', '2009-07-31');
-1
Since: 1.5.0
day
day(date) - Returns the day of month of the date/timestamp.Examples:
> SELECT day('2009-07-30');
30
Since: 1.5.0
dayofmonth
dayofmonth(date) - Returns the day of month of the date/timestamp.Examples:
> SELECT dayofmonth('2009-07-30');
30
Since: 1.5.0
dayofweek
dayofweek(date) - Returns the day of the week for date/timestamp (1 = Sunday, 2 = Monday, ..., 7 = Saturday).Examples:
> SELECT dayofweek('2009-07-30');
5
Since: 2.3.0
dayofyear
dayofyear(date) - Returns the day of year of the date/timestamp.Examples:
> SELECT dayofyear('2016-04-09');
100
Since: 1.5.0
decimal
decimal(expr) - Casts the value 
expr
 to the target data type 
decimal
.
decode
decode(bin, charset) - Decodes the first argument using the second argument character set.Examples:
> SELECT decode(encode('abc', 'utf-8'), 'utf-8');
abc

degrees
degrees(expr) - Converts radians to degrees.Examples:
> SELECT degrees(3.141592653589793);
180.0

dense_rank
dense_rank() - Computes the rank of a value in a group of values. The result is one plus the previously assigned rank value. Unlike the function rank, dense_rank will not produce gaps in the ranking sequence.
double
double(expr) - Casts the value 
expr
 to the target data type 
double
.
e
e() - Returns Euler's number, e.Examples:
> SELECT e();
2.718281828459045

elt
elt(n, input1, input2, ...) - Returns the 
n
-th input, e.g., returns 
input2
 when 
n
 is 2.Examples:
> SELECT elt(1, 'scala', 'java');
scala

encode
encode(str, charset) - Encodes the first argument using the second argument character set.Examples:
> SELECT encode('abc', 'utf-8');
abc

exp
exp(expr) - Returns e to the power of 
expr
.Examples:
> SELECT exp(0);
1.0

explode
explode(expr) - Separates the elements of array 
expr
 into multiple rows, or the elements of map 
expr
 into multiple rows and columns.Examples:
> SELECT explode(array(10, 20));
10
20

explode_outer
explode_outer(expr) - Separates the elements of array 
expr
 into multiple rows, or the elements of map 
expr
 into multiple rows and columns.Examples:
> SELECT explode_outer(array(10, 20));
10
20

expm1
expm1(expr) - Returns exp(
expr
) - 1.Examples:
> SELECT expm1(0);
0.0

factorial
factorial(expr) - Returns the factorial of 
expr
. 
expr
 is [0..20]. Otherwise, null.Examples:
> SELECT factorial(5);
120

find_in_set
find_in_set(str, str_array) - Returns the index (1-based) of the given string (
str
) in the comma-delimited list (
str_array
). Returns 0, if the string was not found or if the given string (
str
) contains a comma.Examples:
> SELECT find_in_set('ab','abc,b,ab,c,def');
3

first
first(expr[, isIgnoreNull]) - Returns the first value of 
expr
 for a group of rows. If 
isIgnoreNull
 is true, returns only non-null values.
first_value
first_value(expr[, isIgnoreNull]) - Returns the first value of 
expr
 for a group of rows. If 
isIgnoreNull
is true, returns only non-null values.
float
float(expr) - Casts the value 
expr
 to the target data type 
float
.
floor
floor(expr) - Returns the largest integer not greater than 
expr
.Examples:
> SELECT floor(-0.1);
-1
> SELECT floor(5);
5

format_number
format_number(expr1, expr2) - Formats the number 
expr1
 like '#,###,###.##', rounded to 
expr2
decimal places. If 
expr2
 is 0, the result has no decimal point or fractional part. This is supposed to function like MySQL's FORMAT.Examples:
> SELECT format_number(12332.123456, 4);
12,332.1235

format_string
format_string(strfmt, obj, ...) - Returns a formatted string from printf-style format strings.Examples:
> SELECT format_string("Hello World %d %s", 100, "days");
Hello World 100 days

from_json
from_json(jsonStr, schema[, options]) - Returns a struct value with the given 
jsonStr
 and 
schema
.Examples:
> SELECT from_json('{"a":1, "b":0.8}', 'a INT, b DOUBLE');
{"a":1, "b":0.8}
> SELECT from_json('{"time":"26/08/2015"}', 'time Timestamp', map('timestampFormat', 'dd/MM/yyyy'));
{"time":"2015-08-26 00:00:00.0"}
Since: 2.2.0
from_unixtime
from_unixtime(unix_time, format) - Returns 
unix_time
 in the specified 
format
.Examples:
> SELECT from_unixtime(0, 'yyyy-MM-dd HH:mm:ss');
1970-01-01 00:00:00
Since: 1.5.0
from_utc_timestamp
from_utc_timestamp(timestamp, timezone) - Given a timestamp like '2017-07-14 02:40:00.0', interprets it as a time in UTC, and renders that time as a timestamp in the given time zone. For example, 'GMT+1' would yield '2017-07-14 03:40:00.0'.Examples:
> SELECT from_utc_timestamp('2016-08-31', 'Asia/Seoul');
2016-08-31 09:00:00
Since: 1.5.0
get_json_object
get_json_object(json_txt, path) - Extracts a json object from 
path
.Examples:
> SELECT get_json_object('{"a":"b"}', '$.a');
b

greatest
greatest(expr, ...) - Returns the greatest value of all parameters, skipping null values.Examples:
> SELECT greatest(10, 9, 2, 4, 3);
10

grouping
grouping_id
hash
hash(expr1, expr2, ...) - Returns a hash value of the arguments.Examples:
> SELECT hash('Spark', array(123), 2);
-1321691492

hex
hex(expr) - Converts 
expr
 to hexadecimal.Examples:
> SELECT hex(17);
11
> SELECT hex('Spark SQL');
537061726B2053514C

hour
hour(timestamp) - Returns the hour component of the string/timestamp.Examples:
> SELECT hour('2009-07-30 12:58:59');
12
Since: 1.5.0
hypot
hypot(expr1, expr2) - Returns sqrt(
expr1
2 + 
expr2
2).Examples:
> SELECT hypot(3, 4);
5.0

if
if(expr1, expr2, expr3) - If 
expr1
 evaluates to true, then returns 
expr2
; otherwise returns 
expr3
.Examples:
> SELECT if(1 < 2, 'a', 'b');
a

ifnull
ifnull(expr1, expr2) - Returns 
expr2
 if 
expr1
 is null, or 
expr1
 otherwise.Examples:
> SELECT ifnull(NULL, array('2'));
["2"]

in
expr1 in(expr2, expr3, ...) - Returns true if 
expr
 equals to any valN.Arguments:expr1, expr2, expr3, ... - the arguments must be same type.
Examples:
> SELECT 1 in(1, 2, 3);
true
> SELECT 1 in(2, 3, 4);
false
> SELECT named_struct('a', 1, 'b', 2) in(named_struct('a', 1, 'b', 1), named_struct('a', 1, 'b', 3));
false
> SELECT named_struct('a', 1, 'b', 2) in(named_struct('a', 1, 'b', 2), named_struct('a', 1, 'b', 3));
true

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.Examples:
> SELECT initcap('sPark sql');
Spark Sql

inline
inline(expr) - Explodes an array of structs into a table.Examples:
> SELECT inline(array(struct(1, 'a'), struct(2, 'b')));
1  a
2  b

inline_outer
inline_outer(expr) - Explodes an array of structs into a table.Examples:
> SELECT inline_outer(array(struct(1, 'a'), struct(2, 'b')));
1  a
2  b

input_file_block_length
input_file_block_length() - Returns the length of the block being read, or -1 if not available.
input_file_block_start
input_file_block_start() - Returns the start offset of the block being read, or -1 if not available.
input_file_name
input_file_name() - Returns the name of the file being read, or empty string if not available.
instr
instr(str, substr) - Returns the (1-based) index of the first occurrence of 
substr
 in 
str
.Examples:
> SELECT instr('SparkSQL', 'SQL');
6

int
int(expr) - Casts the value 
expr
 to the target data type 
int
.
isnan
isnan(expr) - Returns true if 
expr
 is NaN, or false otherwise.Examples:
> SELECT isnan(cast('NaN' as double));
true

isnotnull
isnotnull(expr) - Returns true if 
expr
 is not null, or false otherwise.Examples:
> SELECT isnotnull(1);
true

isnull
isnull(expr) - Returns true if 
expr
 is null, or false otherwise.Examples:
> SELECT isnull(1);
false

java_method
java_method(class, method[, arg1[, arg2 ..]]) - Calls a method with reflection.Examples:
> SELECT java_method('java.util.UUID', 'randomUUID');
c33fb387-8500-4bfa-81d2-6e0e3e930df2
> SELECT java_method('java.util.UUID', 'fromString', 'a5cf6c42-0c85-418f-af6c-3e4e5b1328f2');
a5cf6c42-0c85-418f-af6c-3e4e5b1328f2

json_tuple
json_tuple(jsonStr, p1, p2, ..., pn) - Returns a tuple like the function get_json_object, but it takes multiple names. All the input parameters and output column types are string.Examples:
> SELECT json_tuple('{"a":1, "b":2}', 'a', 'b');
1  2

kurtosis
kurtosis(expr) - Returns the kurtosis value calculated from values of a group.
lag
lag(input[, offset[, default]]) - Returns the value of 
input
 at the 
offset
th row before the current row in the window. The default value of 
offset
 is 1 and the default value of 
default
 is null. If the value of 
input
 at the 
offset
th row is null, null is returned. If there is no such offset row (e.g., when the offset is 1, the first row of the window does not have any previous row), 
default
 is returned.
last
last(expr[, isIgnoreNull]) - Returns the last value of 
expr
 for a group of rows. If 
isIgnoreNull
 is true, returns only non-null values.
last_day
last_day(date) - Returns the last day of the month which the date belongs to.Examples:
> SELECT last_day('2009-01-12');
2009-01-31
Since: 1.5.0
last_value
last_value(expr[, isIgnoreNull]) - Returns the last value of 
expr
 for a group of rows. If 
isIgnoreNull
 is true, returns only non-null values.
lcase
lcase(str) - Returns 
str
 with all characters changed to lowercase.Examples:
> SELECT lcase('SparkSql');
sparksql

lead
lead(input[, offset[, default]]) - Returns the value of 
input
 at the 
offset
th row after the current row in the window. The default value of 
offset
 is 1 and the default value of 
default
 is null. If the value of 
input
 at the 
offset
th row is null, null is returned. If there is no such an offset row (e.g., when the offset is 1, the last row of the window does not have any subsequent row), 
default
 is returned.
least
least(expr, ...) - Returns the least value of all parameters, skipping null values.Examples:
> SELECT least(10, 9, 2, 4, 3);
2

left
left(str, len) - Returns the leftmost 
len
(
len
 can be string type) characters from the string 
str
,if 
len
 is less or equal than 0 the result is an empty string.Examples:
> SELECT left('Spark SQL', 3);
Spa

length
length(expr) - Returns the character length of string data or number of bytes of binary data. The length of string data includes the trailing spaces. The length of binary data includes binary zeros.Examples:
> SELECT length('Spark SQL ');
10
> SELECT CHAR_LENGTH('Spark SQL ');
10
> SELECT CHARACTER_LENGTH('Spark SQL ');
10

levenshtein
levenshtein(str1, str2) - Returns the Levenshtein distance between the two given strings.Examples:
> SELECT levenshtein('kitten', 'sitting');
3

like
str like pattern - Returns true if str matches pattern, null if any arguments are null, false otherwise.Arguments:str - a string expression
pattern - a string expression. The pattern is a string which is matched literally, with exception to the following special symbols:_ matches any one character in the input (similar to . in posix regular expressions)% matches zero or more characters in the input (similar to .* in posix regular expressions)The escape character is '\'. If an escape character precedes a special symbol or another escape character, the following character is matched literally. It is invalid to escape any other character.Since Spark 2.0, string literals are unescaped in our SQL parser. For example, in order to match "\abc", the pattern should be "\abc".When SQL config 'spark.sql.parser.escapedStringLiterals' is enabled, it fallbacks to Spark 1.6 behavior regarding string literal parsing. For example, if the config is enabled, the pattern to match "\abc" should be "\abc".
Examples:
> SELECT '%SystemDrive%\Users\John' like '\%SystemDrive\%\\Users%'
true
Note:Use RLIKE to match with standard regular expressions.
ln
ln(expr) - Returns the natural logarithm (base e) of 
expr
.Examples:
> 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.Examples:
> SELECT locate('bar', 'foobarbar');
4
> SELECT locate('bar', 'foobarbar', 5);
7
> SELECT POSITION('bar' IN 'foobarbar');
4

log
log(base, expr) - Returns the logarithm of 
expr
 with 
base
.Examples:
> SELECT log(10, 100);
2.0

log10
log10(expr) - Returns the logarithm of 
expr
 with base 10.Examples:
> SELECT log10(10);
1.0

log1p
log1p(expr) - Returns log(1 + 
expr
).Examples:
> SELECT log1p(0);
0.0

log2
log2(expr) - Returns the logarithm of 
expr
 with base 2.Examples:
> SELECT log2(2);
1.0

lower
lower(str) - Returns 
str
 with all characters changed to lowercase.Examples:
> 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.Examples:
> SELECT lpad('hi', 5, '??');
???hi
> SELECT lpad('hi', 1, '??');
h

ltrim
ltrim(str) - Removes the leading space characters from 
str
.ltrim(trimStr, str) - Removes the leading string contains the characters from the trim stringArguments:str - a string expression
trimStr - the trim string characters to trim, the default value is a single space
Examples:
> SELECT ltrim('    SparkSQL   ');
SparkSQL
> SELECT ltrim('Sp', 'SSparkSQLS');
arkSQLS

map
map(key0, value0, key1, value1, ...) - Creates a map with the given key/value pairs.Examples:
> SELECT map(1.0, '2', 3.0, '4');
{1.0:"2",3.0:"4"}

map_keys
map_keys(map) - Returns an unordered array containing the keys of the map.Examples:
> 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.Examples:
> SELECT map_values(map(1, 'a', 2, 'b'));
["a","b"]

max
max(expr) - Returns the maximum value of 
expr
.
md5
md5(expr) - Returns an MD5 128-bit checksum as a hex string of 
expr
.Examples:
> SELECT md5('Spark');
8cde774d6f7333752ed72cacddb05126

mean
mean(expr) - Returns the mean calculated from values of a group.
min
min(expr) - Returns the minimum value of 
expr
.
minute
minute(timestamp) - Returns the minute component of the string/timestamp.Examples:
> SELECT minute('2009-07-30 12:58:59');
58
Since: 1.5.0
mod
expr1 mod expr2 - Returns the remainder after 
expr1
/
expr2
.Examples:
> SELECT 2 mod 1.8;
0.2
> SELECT MOD(2, 1.8);
0.2

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.
month
month(date) - Returns the month component of the date/timestamp.Examples:
> SELECT month('2016-07-30');
7
Since: 1.5.0
months_between
months_between(timestamp1, timestamp2) - Returns number of months between 
timestamp1
 and 
timestamp2
.Examples:
> SELECT months_between('1997-02-28 10:30:00', '1996-10-30');
3.94959677
Since: 1.5.0
named_struct
named_struct(name1, val1, name2, val2, ...) - Creates a struct with the given field names and values.Examples:
> SELECT named_struct("a", 1, "b", 2, "c", 3);
{"a":1,"b":2,"c":3}

nanvl
nanvl(expr1, expr2) - Returns 
expr1
 if it's not NaN, or 
expr2
 otherwise.Examples:
> SELECT nanvl(cast('NaN' as double), 123);
123.0

negative
negative(expr) - Returns the negated value of 
expr
.Examples:
> SELECT negative(1);
-1

next_day
next_day(start_date, day_of_week) - Returns the first date which is later than 
start_date
 and named as indicated.Examples:
> SELECT next_day('2015-01-14', 'TU');
2015-01-20
Since: 1.5.0
not
not expr - Logical not.
now
now() - Returns the current timestamp at the start of query evaluation.Since: 1.5.0
ntile
ntile(n) - Divides the rows for each window partition into 
n
 buckets ranging from 1 to at most 
n
.
nullif
nullif(expr1, expr2) - Returns null if 
expr1
 equals to 
expr2
, or 
expr1
 otherwise.Examples:
> SELECT nullif(2, 2);
NULL

nvl
nvl(expr1, expr2) - Returns 
expr2
 if 
expr1
 is null, or 
expr1
 otherwise.Examples:
> SELECT nvl(NULL, array('2'));
["2"]

nvl2
nvl2(expr1, expr2, expr3) - Returns 
expr2
 if 
expr1
 is not null, or 
expr3
 otherwise.Examples:
> SELECT nvl2(NULL, 2, 1);
1

octet_length
octet_length(expr) - Returns the byte length of string data or number of bytes of binary data.Examples:
> SELECT octet_length('Spark SQL');
9

or
expr1 or expr2 - Logical OR.
parse_url
parse_url(url, partToExtract[, key]) - Extracts a part from a URL.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() - Computes the percentage ranking of a value in a group of values.
percentile
percentile(col, percentage [, frequency]) - Returns the exact percentile value of numeric column 
col
at the given percentage. The value of percentage must be between 0.0 and 1.0. The value of frequency should be positive integralpercentile(col, array(percentage1 [, percentage2]...) [, frequency]) - Returns the exact percentile value array of numeric column 
col
 at the given percentage(s). Each value of the percentage array must be between 0.0 and 1.0. The value of frequency should be positive integral
percentile_approx
percentile_approx(col, percentage [, accuracy]) - Returns the approximate percentile value of numeric column 
col
 at the given percentage. The value of percentage must be between 0.0 and 1.0. The 
accuracy
 parameter (default: 10000) is a positive numeric literal which controls approximation accuracy at the cost of memory. Higher value of 
accuracy
 yields better accuracy, 
1.0/accuracy
 is the relative error of the approximation. When 
percentage
 is an array, each value of the percentage array must be between 0.0 and 1.0. In this case, returns the approximate percentile array of column 
col
 at the given percentage array.Examples:
> SELECT percentile_approx(10.0, array(0.5, 0.4, 0.1), 100);
[10.0,10.0,10.0]
> SELECT percentile_approx(10.0, 0.5, 100);
10.0

pi
pi() - Returns pi.Examples:
> SELECT pi();
3.141592653589793

pmod
pmod(expr1, expr2) - Returns the positive value of 
expr1
 mod 
expr2
.Examples:
> SELECT pmod(10, 3);
1
> SELECT pmod(-10, 3);
2

posexplode
posexplode(expr) - Separates the elements of array 
expr
 into multiple rows with positions, or the elements of map 
expr
 into multiple rows and columns with positions.Examples:
> SELECT posexplode(array(10,20));
0  10
1  20

posexplode_outer
posexplode_outer(expr) - Separates the elements of array 
expr
 into multiple rows with positions, or the elements of map 
expr
 into multiple rows and columns with positions.Examples:
> SELECT posexplode_outer(array(10,20));
0  10
1  20

position
position(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.Examples:
> SELECT position('bar', 'foobarbar');
4
> SELECT position('bar', 'foobarbar', 5);
7
> SELECT POSITION('bar' IN 'foobarbar');
4

positive
positive(expr) - Returns the value of 
expr
.
pow
pow(expr1, expr2) - Raises 
expr1
 to the power of 
expr2
.Examples:
> SELECT pow(2, 3);
8.0

power
power(expr1, expr2) - Raises 
expr1
 to the power of 
expr2
.Examples:
> SELECT power(2, 3);
8.0

printf
printf(strfmt, obj, ...) - Returns a formatted string from printf-style format strings.Examples:
> SELECT printf("Hello World %d %s", 100, "days");
Hello World 100 days

quarter
quarter(date) - Returns the quarter of the year for date, in the range 1 to 4.Examples:
> SELECT quarter('2016-08-31');
3
Since: 1.5.0
radians
radians(expr) - Converts degrees to radians.Examples:
> SELECT radians(180);
3.141592653589793

rand
rand([seed]) - Returns a random value with independent and identically distributed (i.i.d.) uniformly distributed values in [0, 1).Examples:
> SELECT rand();
0.9629742951434543
> SELECT rand(0);
0.8446490682263027
> SELECT rand(null);
0.8446490682263027

randn
randn([seed]) - Returns a random value with independent and identically distributed (i.i.d.) values drawn from the standard normal distribution.Examples:
> SELECT randn();
-0.3254147983080288
> SELECT randn(0);
1.1164209726833079
> SELECT randn(null);
1.1164209726833079

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. The values will produce gaps in the sequence.
reflect
reflect(class, method[, arg1[, arg2 ..]]) - Calls a method with reflection.Examples:
> SELECT reflect('java.util.UUID', 'randomUUID');
c33fb387-8500-4bfa-81d2-6e0e3e930df2
> SELECT reflect('java.util.UUID', 'fromString', 'a5cf6c42-0c85-418f-af6c-3e4e5b1328f2');
a5cf6c42-0c85-418f-af6c-3e4e5b1328f2

regexp_extract
regexp_extract(str, regexp[, idx]) - Extracts a group that matches 
regexp
.Examples:
> SELECT regexp_extract('100-200', '(\d+)-(\d+)', 1);
100

regexp_replace
regexp_replace(str, regexp, rep) - Replaces all substrings of 
str
 that match 
regexp
 with 
rep
.Examples:
> SELECT regexp_replace('100-200', '(\d+)', 'num');
num-num

repeat
repeat(str, n) - Returns the string which repeats the given string value n times.Examples:
> SELECT repeat('123', 2);
123123

replace
replace(str, search[, replace]) - Replaces all occurrences of 
search
 with 
replace
.Arguments:str - a string expression
search - a string expression. If 
search
 is not found in 
str
, 
str
 is returned unchanged.
replace - a string expression. If 
replace
 is not specified or is an empty string, nothing replaces the string that is removed from 
str
.
Examples:
> SELECT replace('ABCabc', 'abc', 'DEF');
ABCDEF

reverse
reverse(str) - Returns the reversed given string.Examples:
> SELECT reverse('Spark SQL');
LQS krapS

right
right(str, len) - Returns the rightmost 
len
(
len
 can be string type) characters from the string 
str
,if 
len
 is less or equal than 0 the result is an empty string.Examples:
> SELECT right('Spark SQL', 3);
SQL

rint
rint(expr) - Returns the double value that is closest in value to the argument and is equal to a mathematical integer.Examples:
> SELECT rint(12.3456);
12.0

rlike
str rlike regexp - Returns true if 
str
 matches 
regexp
, or false otherwise.Arguments:str - a string expression
regexp - a string expression. The pattern string should be a Java regular expression.Since Spark 2.0, string literals (including regex patterns) are unescaped in our SQL parser. For example, to match "\abc", a regular expression for 
regexp
 can be "^\abc$".There is a SQL config 'spark.sql.parser.escapedStringLiterals' that can be used to fallback to the Spark 1.6 behavior regarding string literal parsing. For example, if the config is enabled, the 
regexp
 that can match "\abc" is "^\abc$".
Examples:
When spark.sql.parser.escapedStringLiterals is disabled (default).
> SELECT '%SystemDrive%\Users\John' rlike '%SystemDrive%\\Users.*'
true

When spark.sql.parser.escapedStringLiterals is enabled.
> SELECT '%SystemDrive%\Users\John' rlike '%SystemDrive%\Users.*'
true
Note:Use LIKE to match with simple string pattern.
rollup
round
round(expr, d) - Returns 
expr
 rounded to 
d
 decimal places using HALF_UP rounding mode.Examples:
> SELECT round(2.5, 0);
3.0

row_number
row_number() - Assigns a unique, sequential number to each row, starting with one, according to the ordering of rows within the window partition.
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.Examples:
> SELECT rpad('hi', 5, '??');
hi???
> SELECT rpad('hi', 1, '??');
h

rtrim
rtrim(str) - Removes the trailing space characters from 
str
.rtrim(trimStr, str) - Removes the trailing string which contains the characters from the trim string from the 
str
Arguments:str - a string expression
trimStr - the trim string characters to trim, the default value is a single space
Examples:
> SELECT rtrim('    SparkSQL   ');
SparkSQL
> SELECT rtrim('LQSa', 'SSparkSQLS');
SSpark

second
second(timestamp) - Returns the second component of the string/timestamp.Examples:
> SELECT second('2009-07-30 12:58:59');
59
Since: 1.5.0
sentences
sentences(str[, lang, country]) - Splits 
str
 into an array of array of words.Examples:
> SELECT sentences('Hi there! Good morning.');
[["Hi","there"],["Good","morning"]]

sha
sha(expr) - Returns a sha1 hash value as a hex string of the 
expr
.Examples:
> SELECT sha('Spark');
85f5955f4b27a9a4c2aab6ffe5d7189fc298b92c

sha1
sha1(expr) - Returns a sha1 hash value as a hex string of the 
expr
.Examples:
> SELECT sha1('Spark');
85f5955f4b27a9a4c2aab6ffe5d7189fc298b92c

sha2
sha2(expr, bitLength) - Returns a checksum of SHA-2 family as a hex string of 
expr
. SHA-224, SHA-256, SHA-384, and SHA-512 are supported. Bit length of 0 is equivalent to 256.Examples:
> SELECT sha2('Spark', 256);
529bc3b07127ecb7e53a4dcf1991d9152c24537d919178022b2c42657f79a26b

shiftleft
shiftleft(base, expr) - Bitwise left shift.Examples:
> SELECT shiftleft(2, 1);
4

shiftright
shiftright(base, expr) - Bitwise (signed) right shift.Examples:
> SELECT shiftright(4, 1);
2

shiftrightunsigned
shiftrightunsigned(base, expr) - Bitwise unsigned right shift.Examples:
> SELECT shiftrightunsigned(4, 1);
2

sign
sign(expr) - Returns -1.0, 0.0 or 1.0 as 
expr
 is negative, 0 or positive.Examples:
> SELECT sign(40);
1.0

signum
signum(expr) - Returns -1.0, 0.0 or 1.0 as 
expr
 is negative, 0 or positive.Examples:
> SELECT signum(40);
1.0

sin
sin(expr) - Returns the sine of 
expr
.Examples:
> SELECT sin(0);
0.0

sinh
sinh(expr) - Returns the hyperbolic sine of 
expr
.Examples:
> SELECT sinh(0);
0.0

size
size(expr) - Returns the size of an array or a map. Returns -1 if null.Examples:
> SELECT size(array('b', 'd', 'c', 'a'));
4

skewness
skewness(expr) - Returns the skewness value calculated from values of a group.
smallint
smallint(expr) - Casts the value 
expr
 to the target data type 
smallint
.
sort_array
sort_array(array[, ascendingOrder]) - Sorts the input array in ascending or descending order according to the natural ordering of the array elements.Examples:
> SELECT sort_array(array('b', 'd', 'c', 'a'), true);
["a","b","c","d"]

soundex
soundex(str) - Returns Soundex code of the string.Examples:
> SELECT soundex('Miller');
M460

space
space(n) - Returns a string consisting of 
n
 spaces.Examples:
> SELECT concat(space(2), '1');
1

spark_partition_id
spark_partition_id() - Returns the current partition id.
split
split(str, regex) - Splits 
str
 around occurrences that match 
regex
.Examples:
> SELECT split('oneAtwoBthreeC', '[ABC]');
["one","two","three",""]

sqrt
sqrt(expr) - Returns the square root of 
expr
.Examples:
> SELECT sqrt(4);
2.0

stack
stack(n, expr1, ..., exprk) - Separates 
expr1
, ..., 
exprk
 into 
n
 rows.Examples:
> SELECT stack(2, 1, 2, 3);
1  2
3  NULL

std
std(expr) - Returns the sample standard deviation calculated from values of a group.
stddev
stddev(expr) - Returns the sample standard deviation calculated from values of a group.
stddev_pop
stddev_pop(expr) - Returns the population standard deviation calculated from values of a group.
stddev_samp
stddev_samp(expr) - Returns the sample standard deviation calculated from values of a group.
str_to_map
str_to_map(text[, pairDelim[, keyValueDelim]]) - Creates a map after splitting the text into key/value pairs using delimiters. Default delimiters are ',' for 
pairDelim
 and ':' for 
keyValueDelim
.Examples:
> SELECT str_to_map('a:1,b:2,c:3', ',', ':');
map("a":"1","b":"2","c":"3")
> SELECT str_to_map('a');
map("a":null)

string
string(expr) - Casts the value 
expr
 to the target data type 
string
.
struct
struct(col1, col2, col3, ...) - Creates a struct with the given field values.
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
.Examples:
> 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
.Examples:
> 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. The function substring_index performs a case-sensitive match when searching for 
delim
.Examples:
> SELECT substring_index('www.apache.org', '.', 2);
www.apache

sum
sum(expr) - Returns the sum calculated from values of a group.
tan
tan(expr) - Returns the tangent of 
expr
.Examples:
> SELECT tan(0);
0.0

tanh
tanh(expr) - Returns the hyperbolic tangent of 
expr
.Examples:
> SELECT tanh(0);
0.0

timestamp
timestamp(expr) - Casts the value 
expr
 to the target data type 
timestamp
.
tinyint
tinyint(expr) - Casts the value 
expr
 to the target data type 
tinyint
.
to_date
to_date(date_str[, fmt]) - Parses the 
date_str
 expression with the 
fmt
 expression to a date. Returns null with invalid input. By default, it follows casting rules to a date if the 
fmt
 is omitted.Examples:
> SELECT to_date('2009-07-30 04:17:52');
2009-07-30
> SELECT to_date('2016-12-31', 'yyyy-MM-dd');
2016-12-31
Since: 1.5.0
to_json
to_json(expr[, options]) - Returns a json string with a given struct valueExamples:
> SELECT to_json(named_struct('a', 1, 'b', 2));
{"a":1,"b":2}
> SELECT to_json(named_struct('time', to_timestamp('2015-08-26', 'yyyy-MM-dd')), map('timestampFormat', 'dd/MM/yyyy'));
{"time":"26/08/2015"}
> SELECT to_json(array(named_struct('a', 1, 'b', 2));
[{"a":1,"b":2}]
> SELECT to_json(map('a', named_struct('b', 1)));
{"a":{"b":1}}
> SELECT to_json(map(named_struct('a', 1),named_struct('b', 2)));
{"[1]":{"b":2}}
> SELECT to_json(map('a', 1));
{"a":1}
> SELECT to_json(array((map('a', 1))));
[{"a":1}]
Since: 2.2.0
to_timestamp
to_timestamp(timestamp[, fmt]) - Parses the 
timestamp
 expression with the 
fmt
 expression to a timestamp. Returns null with invalid input. By default, it follows casting rules to a timestamp if the 
fmt
 is omitted.Examples:
> SELECT to_timestamp('2016-12-31 00:12:00');
2016-12-31 00:12:00
> SELECT to_timestamp('2016-12-31', 'yyyy-MM-dd');
2016-12-31 00:00:00
Since: 2.2.0
to_unix_timestamp
to_unix_timestamp(expr[, pattern]) - Returns the UNIX timestamp of the given time.Examples:
> SELECT to_unix_timestamp('2016-04-08', 'yyyy-MM-dd');
1460041200
Since: 1.6.0
to_utc_timestamp
to_utc_timestamp(timestamp, timezone) - Given a timestamp like '2017-07-14 02:40:00.0', interprets it as a time in the given time zone, and renders that time as a timestamp in UTC. For example, 'GMT+1' would yield '2017-07-14 01:40:00.0'.Examples:
> SELECT to_utc_timestamp('2016-08-31', 'Asia/Seoul');
2016-08-30 15:00:00
Since: 1.5.0
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.Examples:
> SELECT translate('AaBbCc', 'abc', '123');
A1B2C3

trim
trim(str) - Removes the leading and trailing space characters from 
str
.trim(BOTH trimStr FROM str) - Remove the leading and trailing 
trimStr
 characters from 
str
trim(LEADING trimStr FROM str) - Remove the leading 
trimStr
 characters from 
str
trim(TRAILING trimStr FROM str) - Remove the trailing 
trimStr
 characters from 
str
Arguments:str - a string expression
trimStr - the trim string characters to trim, the default value is a single space
BOTH, FROM - these are keywords to specify trimming string characters from both ends of the string
LEADING, FROM - these are keywords to specify trimming string characters from the left end of the string
TRAILING, FROM - these are keywords to specify trimming string characters from the right end of the string
Examples:
> SELECT trim('    SparkSQL   ');
SparkSQL
> SELECT trim('SL', 'SSparkSQLS');
parkSQ
> SELECT trim(BOTH 'SL' FROM 'SSparkSQLS');
parkSQ
> SELECT trim(LEADING 'SL' FROM 'SSparkSQLS');
parkSQLS
> SELECT trim(TRAILING 'SL' FROM 'SSparkSQLS');
SSparkSQ

trunc
trunc(date, fmt) - Returns 
date
 with the time portion of the day truncated to the unit specified by the format model 
fmt
. 
fmt
 should be one of ["year", "yyyy", "yy", "mon", "month", "mm"]Examples:
> SELECT trunc('2009-02-12', 'MM');
2009-02-01
> SELECT trunc('2015-10-27', 'YEAR');
2015-01-01
Since: 1.5.0
ucase
ucase(str) - Returns 
str
 with all characters changed to uppercase.Examples:
> SELECT ucase('SparkSql');
SPARKSQL

unbase64
unbase64(str) - Converts the argument from a base 64 string 
str
 to a binary.Examples:
> SELECT unbase64('U3BhcmsgU1FM');
Spark SQL

unhex
unhex(expr) - Converts hexadecimal 
expr
 to binary.Examples:
> SELECT decode(unhex('537061726B2053514C'), 'UTF-8');
Spark SQL

unix_timestamp
unix_timestamp([expr[, pattern]]) - Returns the UNIX timestamp of current or specified time.Examples:
> SELECT unix_timestamp();
1476884637
> SELECT unix_timestamp('2016-04-08', 'yyyy-MM-dd');
1460041200
Since: 1.5.0
upper
upper(str) - Returns 
str
 with all characters changed to uppercase.Examples:
> SELECT upper('SparkSql');
SPARKSQL

uuid
uuid() - Returns an universally unique identifier (UUID) string. The value is returned as a canonical UUID 36-character string.Examples:
> SELECT uuid();
46707d92-02f4-4817-8116-a4c3b23e6266

var_pop
var_pop(expr) - Returns the population variance calculated from values of a group.
var_samp
var_samp(expr) - Returns the sample variance calculated from values of a group.
variance
variance(expr) - Returns the sample variance calculated from values of a group.
weekofyear
weekofyear(date) - Returns the week of the year of the given date. A week is considered to start on a Monday and week 1 is the first week with >3 days.Examples:
> SELECT weekofyear('2008-02-20');
8
Since: 1.5.0
when
CASE WHEN expr1 THEN expr2 [WHEN expr3 THEN expr4]* [ELSE expr5] END - When 
expr1
 = true, returns 
expr2
; else when 
expr3
 = true, returns 
expr4
; else returns 
expr5
.Arguments:expr1, expr3 - the branch condition expressions should all be boolean type.
expr2, expr4, expr5 - the branch value expressions and else value expression should all be same type or coercible to a common type.
Examples:
> SELECT CASE WHEN 1 > 0 THEN 1 WHEN 2 > 0 THEN 2.0 ELSE 1.2 END;
1
> SELECT CASE WHEN 1 < 0 THEN 1 WHEN 2 > 0 THEN 2.0 ELSE 1.2 END;
2
> SELECT CASE WHEN 1 < 0 THEN 1 WHEN 2 < 0 THEN 2.0 END;
NULL

window
xpath
xpath(xml, xpath) - Returns a string array of values within the nodes of xml that match the XPath expression.Examples:
> 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) - Returns true if the XPath expression evaluates to true, or if a matching node is found.Examples:
> SELECT xpath_boolean('<a><b>1</b></a>','a/b');
true

xpath_double
xpath_double(xml, xpath) - Returns a double value, the value zero if no match is found, or NaN if a match is found but the value is non-numeric.Examples:
> 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, the value zero if no match is found, or NaN if a match is found but the value is non-numeric.Examples:
> 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, or the value zero if no match is found, or a match is found but the value is non-numeric.Examples:
> SELECT xpath_int('<a><b>1</b><b>2</b></a>', 'sum(a/b)');
3

xpath_long
xpath_long(xml, xpath) - Returns a long integer value, or the value zero if no match is found, or a match is found but the value is non-numeric.Examples:
> 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, the value zero if no match is found, or NaN if a match is found but the value is non-numeric.Examples:
> 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 integer value, or the value zero if no match is found, or a match is found but the value is non-numeric.Examples:
> 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.Examples:
> SELECT xpath_string('<a><b>b</b><c>cc</c></a>','a/c');
cc

year
year(date) - Returns the year component of the date/timestamp.Examples:
> SELECT year('2016-07-30');
2016
Since: 1.5.0
|
expr1 | expr2 - Returns the result of bitwise OR of 
expr1
 and 
expr2
.Examples:
> SELECT 3 | 5;
7

~
~ expr - Returns the result of bitwise NOT of 
expr
.Examples:
> SELECT ~ 0;
-1
本人使用sparksql处理大数据做过很多个项目，也遇到了很多问题，希望能够与大家共同讨论sparksql的应用技巧和应用难题，大家也可以抛出自己的问题我们共同解决。
                                            

                                        

                        
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                                                spark sql
                                                函数
                                                大数据
                                                sparksql
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