Supported Functions¶
Out of the box, the engine packs a large collection of functions the user can utilize. The engine has been written to be extended. A user can provide his own function(s). Please follow the User Defined Functions chapter for understanding how to enrich the existing functions set.
Name  Description  Usage 

ANONYMIZE  Obfuscates the data, in order to protect it. If the anonymized
value is not provided it will use
* for String and 0 for Numbers 
anonymize(expression [,Anonymized value]) 
CAST  Enables conversion of values from one data type to another  cast(dt as int) 
COALESCE  Returns the first nonnull expression in the expression list.
You must specify two expressions

coalesce(value, prevValue) 
CONCAT  Returns the string representation of concatenating each
expression in the list. Null fields are left out

concatenate(weather.main, 'fixed', dt,temp.eve) 
CONCATENATE  An alias for concat.

concatenate(weather.main, 'fixed', dt,temp.eve) 
LEN  Returns the length of a string. LEN calculates length
using characters as defined by UTF16

len(name) 
POSITION  Return the position of the first occurrence of substring  position('math' in fieldA) 
REPLACE  Returns string with every occurrence of
search_string replaced with
replacement_string 
replace(fieldA, 'math', 'mathematics') 
SUBSTRING  Return a portion of the string, beginning at the given position  substring(field, 2) 
CONTAINS  Return true if an expression contains the given substring  contains(field1, field2) 
STARTSWITH  Return true if an expression starts with the given substring  startswith(field1, field2) 
ENDSWITH  Return true if an expression ends with the given substring  endswith(field1, field2) 
TRIM  Removes leading and trailing spaces from the input expression  trim(expression) 
CHOP  Returns the last character from an expression of type string  chop(expression) 
UNIX_TIMESTAMP  Converts the given date into the timestamp as a long  unix_timestamp(field) 
DELETEWHITESPACE  Removes all whitespace from an expression of type string  deletewhitespace(expression) 
LOWER  Returns the expression in lowercase  lower(expression) 
UPPER  Returns the expression in uppercase  upper(expression) 
LOWERCASE  An alias for lower  lowercase(expression) 
UPPERCASE  An alias for upper  uppercase(expression) 
TAKELEFT  Returns the left most ‘length’ characters from a string expression  takeleft(expression, length) 
TAKERIGHT  Returns the right most ‘length’ characters from a string expression  takeright(expression, length) 
DROPLEFT  Removes the left most ‘length’ characters from a string expression  dropleft(expression, length) 
DROPRIGHT  Removes the left most ‘length’ characters from a string expression  dropright(expression, length) 
DUMP  Show the internal representation of a value  dump(expression) 
SIZEOF  Returns the number of elements in an array of object  sizeof(expression) 
DIGITS  Retains only the digits from a string expression  digits(expression) 
TYPEOF  Returns the object type of a complex expression. This can only be used when
the format on the wire includes the details of the
objects full name.

typeof(expression) 
CAPITALIZE  Capitalizes the first letter of the expression  capitalize(expression) 
CAMELCASE  Uncapitalizes the first letter of the expression  camelcase(expression) 
TRUNCATE  Truncates the expression by removing whitespace from the beginning and end  truncate(expression) 
ABBREVIATE  Abbreviates the expression to the given length and appends ellipses  abbreviate(expression, length) 
DISTANCE  Calculate the distance between two points using the haversine method  distance(x1, y1, x2, y2) 
INDEXOF  Returns the index of a substring in an expression  abbreviate(expression, substring) 
RADIANS  Converts the input expression to radians  radians(expression) 
DEGREES  Converts the input expression to degrees  degrees(expression) 
SIN  Returns the trigonometric sine of an expression  sin(expression) 
COS  Returns the trigonometric cosine of an expression  cos(expression) 
TAN  Returns the trigonometric tangent of an expression  tan(expression) 
ASIN  Returns the trigonometric arc sine of an expression  asin(expression) 
ACOS  Returns the trigonometric arc cosine of an expression  acos(expression) 
ATAN  Returns the trigonometric arc tangent of an expression  atan(expression) 
SINH  Returns the hyperbolic sine of an expression  sinh(expression) 
COSH  Returns the hyperbolic cosine of an expression  cosh(expression) 
TANH  Returns the hyperbolic tangent of an expression  tanh(expression) 
STRIPACCENTS  Removes diacritics (approximately the same as accents)
from an expression. The case will not be altered.

stripaccents(field1) 
UUID  Returns an universally unique identifier  uuid() 
RANDINT  Returns a random integer  randint() 
SWAPCASE  Swaps the case of a string expression  swapcase() 
ABS  Returns the absolute value of an
expression it has to evaluate to a number type

abs(field1 + field2) 
NEG  Returns the negative value of an
expression it has to evaluate to a number type

neg(field1) 
SIGN  Returns +1 if a value is positive or 1 if a value is negative
it has to evaluate to a number type

sign(field1) 
ROUND  Returns the closest integer of an
expression , with tiesrounding towards positive infinity. it has to evaluate
to a number type

round(field1) 
CEIL  Returns the absolute value of an
expression it has to evaluate to a number type

ceil(field1) 
FLOOR  Return the largest value not greater than the argument  floor(field1) 
‘%’  The remainder operator (%) computes the remainder after
dividing its first operand by its second. Each expression has
to evaluate to a number

a % b 
‘/’  Divides one number by another (an arithmetic operator)
Each expression has to evaluate to a number

a / b 
‘‘  Subtracts one number from another (an arithmetic operator)
Each expression has to evaluate to a number

a  b 
‘*’  Multiplies one number from another (an arithmetic operator)
Each expression has to evaluate to a number

a * b 
‘+’  Adds one number to another (an arithmetic operator)
Each expression has to evaluate to a number

a + b 
‘‘ (negative)  Returns the negative of the value of a numeric expression
(a unary operator). The expression has to evaluate to a number

a * b 
POW  Returns expression1 raised to the expression2 power.
Each expression has to evaluate to a number

pow(a, b) 
SQRT  Returns the square root of expression.
The expression has to evaluate to a number

sqrt(a) 
CBRT  Returns the cube root of expression.
The expression has to evaluate to a number

cbrt(a) 
COUNT  Returns the number of records read
ONLY FOR STREAMING when grouping is involved 
SELECT count(*) 
MAX  Returns maximum value of expression.
ONLY FOR STREAMING when grouping is involved 
max(field1) 
MIN  Returns minimum value of expression.
ONLY FOR STREAMING when grouping is involved 
min(field1) 
SUM  Returns the sum of expression for each record read.
ONLY FOR STREAMING when grouping is involved 
sum(field1) 
IF  Evaluates the boolean result for condition. If true it will
return the value of expr1; otherwise, it evaluates and
returns the value of expr2

if(condition, expr1,expr2) 
LPAD  Prepends the value of padExpr to the value of strExpr
until the total length is lengthExpr

LPAD(strExpr, lengthExpr, padExpr) 
RPAD  Appends the value of padExpr to the value of strExpr
until the total length is lengthExpr

LPAD(strExpr, lengthExpr, padExpr) 
EPOCH_TO_DATETIME  Converts an epoch into a datetime
yyyyMMdd'T'HH:mm:ss.SSSZ strExpr needs to be a LONG value containing the
milliseconds since 1 January 1970 00:00:00)

EPOCH_TO_DATETIME(strExpr) 
EPOCH_TO_DATE  Converts an epoch into a date
yyyyMMdd The strExpr needs to resolve to INT/LONG value. If the
value is an INT it is expected to be the day represented
as days since epoch

EPOCH_TO_DATE(strExpr) 
DATETIME_TO_EPOCH
FROM_DATETIME
FROMDATETIME

Converts a string representation of a datetime into epoch value.
The first parameter strExpr needs to be a STRING value.
The second parameter pattern must be a DateTime Format

FROM_DATETIME(strExpr, pattern) 
DATE_TO_EPOCH  Converts a string representation of a date into epoch value.
For AVRO records, this will emit a field with a logical type of
Date. This means the output value is an INT and it represents
the days since Epoch. For JSON records the resulted value is the
epoch expressed as LONG. The first parameter strExpr needs to
resolve to a STRING value. The second parameter pattern,
must be a Date Format

DATE_TO_EPOCH(strExpr, pattern) 
CONVERT_TIME  Converts the string format of a date [and time]. The first
parameter strExpr needs be a STRING value. The second
parameter fromPattern is the incoming date[and time] format.
The last parameter represents the target date[and time] format.

CONVERT_TIME(strExpr, fromPattern, toPattern) 
CURDATE
CURRENT_DATE

Provides the current ISO date value

CURDATE()/CURRENT_DATE() 
CURRENT_DATETIME
CURRENT_DATETIME
CURTIME

Provides the current ISO date and time.

CURTIME()/CURRENT_DATETIME() 
YESTERDAY  Returns the current date time minus 1 day  yesterday() 
TOMORROW  Returns the current date time plus 1 day  tomorrow() 
NEXTWEEK  Return the current date time plus 1 week  nextweek() 
LASTWEEK  Return the current date time minus 1 week  lastweek() 
NEXTMONTH  Return the current date time plus 1 month  nextmonth() 
LASTMONTH  Return the current date time minus 1 month  lastmonth() 
DAY  Extracts the day component of an expression that is of type timestamp  day(expression) 
HOUR  Extracts the hour component of an expression that is of type timestamp  hour(expression) 
MINUTE  Extracts the minute component of an expression that is of type timestamp  minute(expression) 
SECOND  Extracts the second component of an expression that is of type timestamp  second(expression) 
MONTH  Extracts the month component of an expression that is of type timestamp  month(expression) 
YEAR  Extracts the year component of an expression that is of type timestamp  year(expression) 
ARRAY_SIZE  Returns the count of elements contained by the parameter.
It is expected the parameter, evaluates to
an array structure.

ARRAY_SIZE(EXPR) 
REGEXP  Returns the matched groups otherwise null.
Consider this regular expression
(MrMrsMs) ([AZ][az]+) ([AZ][az]+) and this input
Ms Jane Smith ; the return values are:["Ms Jane Smith", "Ms", "Jane", "Smith"] . 
REGEXP(SQL_EXPR, REGEX_EXPR) 
REGEXP_LIKE  Returns true if the input value matches the expression
otherwise false.

REGEXP_LIKE(SQL_EXPR, REGEX_EXPR) 
REGEXP_REPLACE  Replace the matched text with the provided value.
If there’s no match the input will
remain the same.

REGEXP_REPLACE(SQL_EXPR, SQL_EXPR, REGEX_EXPR) 
EXISTS  Returns true if the given field is present;
false otherwise.

EXISTS(FIELD_EXPR) 
HEADERASSTRING  Returns the value of the record header key as
a STRING value.

HEADERASSTRING('HEADER_KEY') 
HEADERASINT  Returns the value of the record header key as
an INT value.

HEADERASINT('HEADER_KEY') 
HEADERASLONG  Returns the value of the record header key as
a LONG value.

HEADERASLONG('HEADER_KEY') 
HEADERASDOUBLE  Returns the value of the record header key as
a DOUBLE value.

HEADERASDOUBLE('HEADER_KEY') 
HEADERASFLOAT  Returns the value of the record header key as a FLOAT value.

HEADERASFLOAT('HEADER_KEY') 
HEADERKEYS  Returns all the header keys for the current record.

HEADERKEYS() 