Impala supports several categories of built-in functions. These functions let you
perform mathematical calculations, string manipulation, date calculations, and other kinds of
data transformations directly in SQL
statements.
The categories of built-in functions supported by Impala are:
The following is a complete list of built-in functions supported in Impala:
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ABS
|
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ACOS
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ADD_MONTHS
|
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ADDDATE
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APPX_MEDIAN
|
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ASCII
|
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ASIN
|
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ATAN
|
|
ATAN2
|
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AVG
|
|
AVG - Analytic Function
|
|
BASE64DECODE
|
|
BASE64ENCODE
|
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BITAND
|
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BIN
|
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BITNOT
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BITOR
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BITXOR
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BTRIM
|
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CASE
|
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CASE WHEN
|
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CAST
|
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CEIL, CEILING, DCEIL
|
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CHAR_LENGTH
|
|
CHR
|
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COALESCE
|
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CONCAT
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CONCAT_WS
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CONV
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COS
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COSH
|
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COT
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COUNT
|
|
COUNT - Analytic Function
|
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COUNTSET
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CUME_DIST
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CURRENT_DATABASE
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CURRENT_TIMESTAMP
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DATE_ADD
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DATE_PART
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DATE_SUB
|
|
DATE_TRUNC
|
|
DATEDIFF
|
|
DAY
|
|
DAYNAME
|
|
DAYOFWEEK
|
|
DAYOFYEAR
|
|
DAYS_ADD
|
|
DAYS_SUB
|
|
DECODE
|
|
DEGREES
|
|
DENSE_RANK
|
|
E
|
|
EFFECTIVE_USER
|
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EXP
|
|
EXTRACT
|
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FACTORIAL
|
|
FIND_IN_SET
|
|
FIRST_VALUE
|
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FLOOR, DFLOOR
|
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FMOD
|
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FNV_HASH
|
|
GET_JSON_OBJECT
|
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FROM_UNIXTIME
|
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FROM_TIMESTAMP
|
|
FROM_UTC_TIMESTAMP
|
|
GETBIT
|
|
GREATEST
|
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GROUP_CONCAT
|
|
GROUP_CONCAT - Analytic Function
|
|
HEX
|
|
HOUR
|
|
HOURS_ADD
|
|
HOURS_SUB
|
|
IF
|
|
IFNULL
|
|
INITCAP
|
|
INSTR
|
|
INT_MONTHS_BETWEEN
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IS_INF
|
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IS_NAN
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|
ISFALSE
|
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ISNOTFALSE
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ISNOTTRUE
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ISNULL
|
|
ISTRUE
|
|
JARO_DISTANCE, JARO_DIST
|
|
JARO_SIMILARITY, JARO_SIM
|
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JARO_WINKER_DISTANCE, JW_DST
|
|
JARO_WINKER_SIMILARITY, JW_SIM
|
|
LAG
|
|
LAST_VALUE
|
|
LEAD
|
|
LEAST
|
|
LEFT
|
|
LENGTH
|
|
LN
|
|
LOCATE
|
|
LOG
|
|
LOG10
|
|
LOG2
|
|
LOWER, LCASE
|
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LPAD
|
|
LTRIM
|
|
MAX
|
|
MAX - Analytic Function
|
|
MAX_INT, MAX_TINYINT, MAX_SMALLINT, MAX_BIGINT
|
|
MICROSECONDS_ADD
|
|
MICROSECONDS_SUB
|
|
MILLISECOND
|
|
MILLISECONDS_ADD
|
|
MILLISECONDS_SUB
|
|
MIN
|
|
MIN - Analytic Function
|
|
MIN_INT, MIN_TINYINT, MIN_SMALLINT, MIN_BIGINT
|
|
MINUTE
|
|
MINUTES_ADD
|
|
MINUTES_SUB
|
|
MOD
|
|
MONTH
|
|
MONTHNAME
|
|
MONTHS_ADD
|
|
MONTHS_BETWEEN
|
|
MONTHS_SUB
|
|
MURMUR_HASH
|
|
NANOSECONDS_ADD
|
|
NANOSECONDS_SUB
|
|
NDV
|
|
NEGATIVE
|
|
NEXT_DAY
|
|
NONNULLVALUE
|
|
NOW
|
|
NTILE
|
|
NULLIF
|
|
NULLIFZERO
|
|
NULLVALUE
|
|
NVL
|
|
NVL2
|
|
OVER
Clause
|
|
PARSE_URL
|
|
PERCENT_RANK
|
|
PI
|
|
PID
|
|
PMOD
|
|
POSITIVE
|
|
POW, POWER, DPOW, FPOW
|
|
PRECISION
|
|
QUARTER
|
|
QUOTIENT
|
|
RADIANS
|
|
RAND, RANDOM
|
|
RANK
|
|
REGEXP_ESCAPE
|
|
REGEXP_EXTRACT
|
|
REGEXP_LIKE
|
|
REGEXP_REPLACE
|
|
REPEAT
|
|
REPLACE
|
|
REVERSE
|
|
RIGHT
|
|
ROTATELEFT
|
|
ROTATERIGHT
|
|
ROUND, DROUND
|
|
ROW_NUMBER
|
|
RPAD
|
|
RTRIM
|
|
SCALE
|
|
SECOND
|
|
SECONDS_ADD
|
|
SECONDS_SUB
|
|
SETBIT
|
|
SHIFTLEFT
|
|
SHIFTRIGHT
|
|
SIGN
|
|
SIN
|
|
SINH
|
|
SLEEP
|
|
SPACE
|
|
SPLIT_PART
|
|
SQRT
|
|
STDDEV,
STDDEV_SAMP, STDDEV_POP
|
|
STRLEFT
|
|
STRRIGHT
|
|
SUBDATE
|
|
SUBSTR, SUBSTRING
|
|
SUM
|
|
SUM - Analytic Function
|
|
TAN
|
|
TANH
|
|
TIMEOFDAY
|
|
TIMESTAMP_CMP
|
|
TO_DATE
|
|
TO_TIMESTAMP
|
|
TO_UTC_TIMESTAMP
|
|
TRANSLATE
|
|
TRIM
|
|
TRUNC
|
|
TRUNCATE, DTRUNC, TRUNC
|
|
TYPEOF
|
|
UNHEX
|
|
UNIX_TIMESTAMP
|
|
UPPER, UCASE
|
|
USER
|
|
UTC_TIMESTAMP
|
|
UUID
|
|
VARIANCE,
VARIANCE_SAMP, VARIANCE_POP, VAR_SAMP, VAR_POP
|
|
VERSION
|
|
WEEKOFYEAR
|
|
WEEKS_ADD
|
|
WEEKS_SUB
|
|
WIDTH_BUCKET
|
|
YEAR
|
|
YEARS_ADD
|
|
YEARS_SUB
|
|
ZEROIFNULL
|
