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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.

BIGINT

round(double a)

returns the rounded BIGINT value of the double

BIGINT

floor(double a)

returns the maximum BIGINT value that is equal or less than the double

BIGINT

ceil(double a)

returns the minimum BIGINT value that is equal or greater than the double

double

rand(), rand(int seed)

returns a random number (that changes from row to row). Specifiying the seed will make sure the generated random number sequence is deterministic.

string

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

returns the string resulting from concatenating B after A. For example, concat('foo', 'bar') results in 'foobar'. This function accepts arbitrary number of arguments and return the concatenation of all of them.

string

substr(string A, int start)

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

string

substr(string A, int start, int length)

returns the substring of A starting from start position with the given length e.g. substr('foobar', 4, 2) results in 'ba'

string

upper(string A)

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

string

ucase(string A)

Same as upper

string

lower(string A)

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

string

lcase(string A)

Same as lower

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. For example, ltrim(' foobar ') results in 'foobar '

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'

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. For example, regexp_replace('foobar', 'oo|ar', ) returns 'fb'

int

size(Map<K.V>)

returns the number of elements in the map type

int

size(Array<T>)

returns the number of elements in the array type

value of <type>

cast(value <expr> as <type>)

converts the results of the expression expr to <type> e.g. cast('1' as BIGINT) will convert the string '1' to it integral representation. A null is returned if the conversion does not succeed.

string

from_unixtime(int unixtime)

convert 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"

string

to_date(string timestamp)

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

int

year(string date)

Return 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)

Return 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)

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

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

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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 value of the column in the group

DOUBLE

max(col)

returns the maximum value of the column in the group