Functions available in SQL statements

Mathematical functions

function name	Purpose	parameter	Returned value
abs	Absolute value	Operand	absolute value
cos	Cosine	Operand	Cosine value
cosh	Hyperbolic cosine	Operand	Hyperbolic cosine value
acos	Inverse cosine	Operand	Inverse cosine value
acosh	Inverse hyperbolic cosine	Operand	Inverse hyperbolic cosine value
sin	Sine	Operand	Sine value
sinh	Hyperbolic sine	Operand	Hyperbolic sine value
asin	Arcsine	Operand	Arcsine value
asinh	inverse hyperbolic sine	Operand	inverse hyperbolic sine value
tan	tangent	Operand	tangent value
tanh	Hyperbolic tangent	Operand	Hyperbolic tangent value
atan	Arc tangent	Operand	Arc tangent value
atanh	Inverse hyperbolic tangent	Operand	Inverse hyperbolic tangent value
ceil	Round up	Operand	Integer value
floor	Round down	Operand	Integer value
round	rounding	Operand	Integer value
exp	Exponentiation	Operand	X power of e
power	Exponential operation	1. Left operand x 2. Right operand y	Y power of X
sqrt	Square root operation	Operand	Square root
fmod	Floating point modulus function	1. left Operand 2.right Operand	module
log	Logarithm to e	Operand	value
log10	Logarithm to 10	Operand	value
log2	Logarithm to 2	Operand	value

abs(-12) = 12
cos(1.5) = 0.0707372016677029
cosh(1.5) = 2.352409615243247
acos(0.0707372016677029) = 1.5
acosh(2.352409615243247) = 1.5
sin(0.5) = 0.479425538604203
sinh(0.5) = 0.5210953054937474
asin(0.479425538604203) = 0.5
asinh(0.5210953054937474) = 0.5
tan(1.4) = 5.797883715482887
tanh(1.4) = 0.8853516482022625
atan(5.797883715482887) = 1.4
atanh(0.8853516482022625) = 1.4000000000000001
ceil(1.34) = 2
floor(1.34) = 1
round(1.34) = 1
round(1.54) = 2
exp(10) = 22026.465794806718
power(2, 10) = 1024
sqrt(2) = 1.4142135623730951
fmod(-32, 5) = -2
log10(1000) = 3
log2(1024) = 10

Data type judgment function

Function name	Purpose	parameter	Returned value
is_null	Checks if a variable is null. Note: This function cannot determine the JSON null type; use is_null_var instead.	Data	Returns true if the variable is null (undefined); otherwise, returns false.
is_not_null	Checks if a variable is not null. Note: This function cannot determine the JSON null type; use is_null_var instead.	Data	Returns false if the variable is null (undefined); otherwise, returns true.
is_null_var	Checks if a variable is null.	Data	Returns true if the variable is null (undefined); otherwise, returns false.
is_not_null_var	Checks if a variable is not null.	Data	Returns false if the variable is null (undefined); otherwise, returns true.
is_str	Judge whether the variable is String type	Data	Boolean data.
is_bool	Judge if the variable is Boolean type	Data	Boolean data.
is_int	Judge whether the variable is Integer type	Data	Boolean data.
is_float	Judge whether the variable is Float type	Data	Boolean data.
is_num	Judge whether the variable is a numeric type, including Integer and Float types	Data	Boolean data.
is_map	Judge whether the variable is Map type	Data	Boolean data.
is_array	Judge whether the variable is Array type	Data	Boolean data.

is_null(undefined_var) = true
is_null(mget('a', json_decode('{"a": null}'))) = false
is_not_null(1) = true
is_not_null(mget('a', json_decode('{"a": null}'))) = true

is_null_var(undefined_var) = true
is_null_var(mget('a', json_decode('{"a": null}'))) = true
is_not_null_var(1) = true
is_not_null_var(mget('a', json_decode('{"a": null}'))) = false

is_str(1) = false
is_str('val') = true
is_bool(true) = true
is_int(1) = true
is_float(1) = false
is_float(1.234) = true
is_num(2.3) = true
is_num('val') = false

Data type conversion function

function name	purpose	parameter	returned value
str	Convert data to String type	Data	Data of type String. Failure to convert will cause SQL matching to fail
str_utf8	Convert data to UTF-8 String type	Data	UTF-8 String type data. Failure to convert will cause SQL matching to fail
bool	Convert data to Boolean type	Data	Boolean data. Failure to convert will cause SQL matching to fail
int	Convert data to integer type	Data	Integer type data. Failure to convert will cause SQL matching to fail
float	Convert data to floating type	Data	Floating type data. Failure to convert will cause SQL matching to fail
float2str	Convert a float to string using the given precision	1. Float Number 2. Precision	String
map	Convert data to Map type	Data	Map type data. Failure to convert will cause SQL matching to fail

str(1234) = '1234'
str_utf8(1234) = '1234'
bool('true') = true
int('1234') = 1234
float('3.14') = 3.14
float2str(20.2, 10) = '20.2'
float2str(20.2, 17) = '20.19999999999999928'

String Functions

Function Name	Description	Parameters	Return Value
lower	Convert to lowercase	1. Original string	Lowercase string
upper	Convert to uppercase	1. Original string	Uppercase string
trim	Remove leading and trailing spaces	1. Original string	String with spaces removed
ltrim	Remove leading spaces	1. Original string	String with leading spaces removed
rtrim	Remove trailing spaces	1. Original string	String with trailing spaces removed
reverse	Reverse the string	1. Original string	Reversed string
strlen	Get the length of the string	1. Original string	Integer value, character length
substr	Get a substring of the string	1. Original string 2. Starting position (Note: 0-based index)	Substring
substr	Get a substring of the string	1. Original string 2. Starting position 3. Length of the substring to extract (Note: 0-based index)	Substring
split	Split the string	1. Original string 2. Substring for splitting	Array of split strings
split	Split the string, only find the first leading delimiter	1. Original string 2. Substring for splitting 3. 'leading'	Array of split strings
split	Split the string, only find the first trailing delimiter	1. Original string 2. Substring for splitting 3. 'trailing'	Array of split strings
concat	Concatenate strings	1. Left string 2. Right string	Concatenated string
tokens	Tokenize the string (split by a specified substring)	1. Input string 2. Delimiter string	Array of tokenized strings
tokens	Tokenize the string (split by a specified string and ignore line breaks)	1. Input string 2. Delimiter string 3. 'nocrlf'	Array of tokenized strings
sprintf	Format a string (see Format section in Erlang's Format documentation for format string usage)	1. Format string 2, 3, 4... Parameter list. Variable number of parameters	Formatted string
pad	Pad a string with spaces, add from the end	1. Original string 2. Total character length	Padded string
pad	Pad a string with spaces, add from the end	1. Original string 2. Total character length 3. 'trailing'	Padded string
pad	Pad a string with spaces, add from both sides	1. Original string 2. Total character length 3. 'both'	Padded string
pad	Pad a string with spaces, add from the beginning	1. Original string 2. Total character length 3. 'leading'	Padded string
pad	Pad a string with a specified character, add from the end	1. Original string 2. Total character length 3. 'trailing' 4. Character for padding	Padded string
pad	Pad a string with a specified character, add from both sides	1. Original string 2. Total character length 3. 'both' 4. Character for padding	Padded string
pad	Pad a string with a specified character, add from the beginning	1. Original string 2. Total character length 3. 'leading' 4. Character for padding	Padded string
replace	Replace a substring in the string, find and replace all matches	1. Original string 2. Substring to be replaced 3. String for replacement	Replaced string
replace	Replace a substring in the string, find and replace all matches	1. Original string 2. Substring to be replaced 3. String for replacement 4. 'all'	Replaced string
replace	Replace a substring in the string, find and replace the first trailing match	1. Original string 2. Substring to be replaced 3. String for replacement 4. 'trailing'	Replaced string
replace	Replace a substring in the string, find and replace the first leading match	1. Original string 2. Substring to be replaced 3. String for replacement 4. 'leading'	Replaced string
regex_match	Check if a string matches a regular expression pattern	1. Original string 2. Regular expression	true or false
regex_replace	Replace substrings in the string that match a regular expression pattern	1. Original string 2. Regular expression 3. String for replacement	Replaced string
ascii	Get the ASCII code of a character	1. Character	Integer value, ASCII code
find	Find and return a substring in the string, search from the beginning	1. Original string 2. Substring to find	Found substring, empty string if not found
find	Find and return a substring in the string, search from the beginning	1. Original string 2. Substring to find 3. 'leading'	Found substring, empty string if not found
find	Find and return a substring in the string, search from the end	1. Original string 2. Substring to find 3. 'trailing'	Found substring, empty string if not found
join_to_string	Concatenate array elements into a string	1. Array	Concatenated string, comma and space (, ) used as separator
join_to_string	Concatenate array elements into a string	1. Separator string 2. Array	Concatenated string
join_to_sql_values_string	Concatenate array elements into a string, wrapping string elements with single quotes. Useful for building SQL VALUES clauses	1. Array	Concatenated string, comma and space (, ) used as separator

lower('AbC') = 'abc'
lower('abc') = 'abc'

upper('AbC') = 'ABC'` `lower('ABC') = 'ABC'

trim(' hello  ') = 'hello'

ltrim(' hello  ') = 'hello  '

rtrim(' hello  ') = ' hello'

reverse('hello') = 'olleh'

strlen('hello') = 5

substr('abcdef', 2) = 'cdef'
substr('abcdef', 2, 3) = 'cde'

split('a/b/ c', '/') = ['a', 'b', ' c']
split('a/b/ c', '/', 'leading') = ['a', 'b/ c']
split('a/b/ c', '/', 'trailing') = ['a/b', ' c']

concat('a', '/bc') = 'a/bc'
'a' + '/bc' = 'a/bc'

tokens(' a/b/ c', '/') = [' a', 'b', ' c']
tokens(' a/b/ c', '/ ') = ['a', 'b', 'c']
tokens(' a/b/ c\n', '/ ') = ['a', 'b', 'c\n']
tokens(' a/b/ c\n', '/ ', 'nocrlf') = ['a', 'b', 'c']
tokens(' a/b/ c\r\n', '/ ', 'nocrlf') = ['a', 'b', 'c']

sprintf('hello, ~s!', 'steve') = 'hello, steve!'
sprintf('count: ~p~n', 100) = 'count: 100\n'

pad('abc', 5) = 'abc  '
pad('abc', 5, 'trailing') = 'abc  '
pad('abc', 5, 'both') = ' abc '
pad('abc', 5, 'leading') = '  abc'
pad('abc', 5, 'trailing', '*') = 'abc**'
pad('abc', 5, 'trailing', '*#') = 'abc*#*#'
pad('abc', 5, 'both', '*') = '*abc*'
pad('abc', 5, 'both', '*#') = '*#abc*#'
pad('abc', 5, 'leading', '*') = '**abc'
pad('abc', 5, 'leading', '*#') = '*#*#abc'

replace('ababef', 'ab', 'cd') = 'cdcdef'
replace('ababef', 'ab', 'cd', 'all') = 'cdcdef'
replace('ababef', 'ab', 'cd', 'trailing') = 'abcdef'
replace('ababef', 'ab', 'cd', 'leading') = 'cdabef'

regex_match('abc123', '[a-zA-Z1-9]*') = true

regex_replace('ab1cd3ef', '[1-9]', '[&]') = 'ab[1]cd[3]ef'
regex_replace('ccefacef', 'c+', ':') = ':efa:ef'

ascii('a') = 97

find('eeabcabcee', 'abc') = 'abcabcee'
find('eeabcabcee', 'abc', 'leading') = 'abcabcee'
find('eeabcabcee', 'abc', 'trailing') = 'abcee'

join_to_string(['a', 'b', 'c']) = 'a, b, c'
join_to_string('-', ['a', 'b', 'c']) = 'a-b-c'
join_to_sql_values_string(['a', 'b', 1]) = '\'a\', \'b\', 1'

Map Function

Function Name	Function Purpose	Parameters	Return Value
map_new	Creates an empty Map data type	None	An empty Map (Erlang Map type: #{}, equivalent to JSON objects {})
map_get	Retrieves the value of a specific Key in the Map; returns empty if the Key doesn't exist	1. Key 2. Map	The value of a specific Key in the Map. Supports nested Keys, e.g., "a.b.c"
map_get	Retrieves the value of a specific Key in the Map; returns a specified default value if the Key doesn't exist	1. Key 2. Map 3. Default Value	The value of a specific Key in the Map. Supports nested Keys, e.g., "a.b.c"
map_put	Inserts a value into the Map	1. Key 2. Value 3. Map	The Map after the insertion. Supports nested Keys, e.g., "a.b.c"
mget	Retrieves the value of a specific Key in the Map; returns empty if the Key doesn't exist. Similar to map_get but does not support nested Keys	1. Key 2. Map	The value of a specific Key in the Map
mget	Retrieves the value of a specific Key in the Map; returns a specified default value if the Key doesn't exist. Similar to map_get but does not support nested Keys	1. Key 2. Map 3. Default Value	The value of a specific Key in the Map
mput	Inserts a value into the Map. Similar to map_put but does not support nested Keys	1. Key 2. Value 3. Map	The Map after the insertion
map_keys	Retrieves all keys of a Map data type	Map	An array containing all the keys
map_values	Retrieves all values of a Map data type	Map	An array containing all the values
map_to_entries	Converts a Map into an array of Key-Value pairs	Map	An array in the format [#{key => Key}, #{value => Value}], equivalent to JSON [{"key": Key}, {"value": Value}]

map_new() = #{}
json_encode(map_new()) = '{}'
map_get('a', json_decode( '{ "a" : 1 }' )) = 1
map_get('b', json_decode( '{ "a" : 1 }' ), 2) = 2
map_get('a.b', json_decode( '{ "a" : {"b": 2} }' )) = 2
map_put('c', 1, map_new()) = #{c => 1}
map_put('c.d', 1, map_new()) = #{c => #{d => 1}}
json_encode(map_put('c.d', 1, map_new())) = '{"c":{"d":1}}'
mget('a.b', json_decode( '{ "a.b" : 1 }' )) = 1
mget('a.b', json_decode( '{ "a" : {"b": 2} }' )) = undefined
mput('c.d', 1, map_new()) = #{<<"c.d">> => 1}
json_encode(mput('c.d', 1, map_new())) = '{"c.d":1}'
json_encode(map_to_entries('{"a": 1, "b": 2}')) = '[{"value":1,"key":"a"}, {"value":2,"key":"b"}]'
map_keys(json_decode('{ "a" : 1, "b" : 2 }')) = ['a', 'b']
map_values(json_decode('{ "a" : 1, "b" : 2 }')) = [1, 2]

Array function

function name	purpose	parameter	returned value
nth	Take the nth element, and subscripts start at 1	Original array	Nth element
length	Get the length of an array	Original array	the length of an array
sublist	Take a sub-array of length len starting from the first element. Subscripts start at 1	1. length len 2. Original array	sub-array
sublist	Take a sub-array of length len starting from the nth element. Subscripts start at 1	1. start position n 2. length len 3. Original array	sub-array
first	Take the first element. Subscripts start at 1	Original array	1st element
last	take the last element	Original array	the last element
contains	Determine whether the data is in the array	1. data 2. Original array	Boolean value

nth(2, [1,2,3,4]) = 2
length([1,2,3,4]) = 4
sublist(3, [1,2,3,4]) = [1,2,3,4]
sublist(1,2,[1,2,3,4]) = [1, 2]
first([1,2,3,4]) = 1
last([1,2,3,4]) = 4
contains(2, [1,2,3,4]) = true

Hash function

function name	purpose	parameter	returned value
md5	evaluate MD5	data	MD5 value
sha	evaluate SHA	data	SHA value
sha256	evaluate SHA256	data	SHA256 value

md5('some val') = '1b68352b3e9c2de52ffd322e30bffcc4'
sha('some val') = 'f85ba28ff5ea84a0cbfa118319acb0c5e58ee2b9'
sha256('some val') = '67f97635d8a0e064f60ba6e8846a0ac0be664f18f0c1dc6445cd3542d2b71993'

Compresses and Uncompresses functions

Function	Purpose	Parameters	Returned value
gzip	Compresses data with gz headers and checksum.	Raw binary data	Compressed binary data
gunzip	Uncompresses data with gz headers and checksum.	Compressed binary data	Raw binary data
zip	Compresses data without zlib headers and checksum.	Raw binary data	Compressed binary data
unzip	Uncompresses data without zlib headers and checksum.	Compressed binary data	Raw binary data
zip_compress	Compresses data with zlib headers and checksum.	Raw binary data	Compressed binary data
zip_uncompress	Uncompresses data with zlib headers and checksum.	Compressed binary data	Raw binary data

bin2hexstr(gzip('hello world')) = '1F8B0800000000000003CB48CDC9C95728CF2FCA49010085114A0D0B000000'
gunzip(hexstr2bin('1F8B0800000000000003CB48CDC9C95728CF2FCA49010085114A0D0B000000')) = 'hello world'

bin2hexstr(zip('hello world')) = 'CB48CDC9C95728CF2FCA490100'
unzip(hexstr2bin('CB48CDC9C95728CF2FCA490100')) = 'hello world'

bin2hexstr(zip_compress('hello world')) = '789CCB48CDC9C95728CF2FCA4901001A0B045D'
zip_uncompress(hexstr2bin('789CCB48CDC9C95728CF2FCA4901001A0B045D')) = 'hello world'

Bit functions

Function	Purpose	Parameters	Returned value
subbits	Get a given length of bits from the beginning of a binary, and then convert it to an unsigned integer (big-endian).	1. The binary 2. The length of bits to get	The unsigned integer
subbits	Get a given length of bits start from the specified offset of a binary, and then convert it to an unsigned integer (big-endian). Offsets are start from 1.	1. The binary 2. The offset 3. The length of bits to get	The unsigned integer
subbits	Get a given length of bits start from the specified offset of a binary, and then convert it to a data type according to the arguments provided. Offsets are start from 1.	1. The binary 2. The offset 3. The length of bits to get 4. Data Type, can be one of 'integer', 'float', 'bits' 5. Signedness, only works for integers, can be one of 'unsigned', 'signed', 6. Endianness, only works for integers, can be one of 'big', 'little'	The data got from the binary

subbits('abc', 8) = 97
subbits('abc', 9, 8) = 98
subbits('abc', 17, 8) = 99
subbits('abc', 9, 16, 'integer', 'signed', 'big') = 25187
subbits('abc', 9, 16, 'integer', 'signed', 'little') = 25442

Decoding and encoding functions

Function	Purpose	Parameters	Returned value
base64_encode	BASE64 encode	The binary to be encoded	The encoded base64-formatted string
base64_decode	BASE64 decode	The base64-formatted string to be decoded	The decoded binary
json_encode	JSON encode	The data to be encoded	The JSON string
json_decode	JSON decode	The JSON string to be decoded	The decoded data
bin2hexstr	Binary to Hex String	The binary	The hex string
hexstr2bin	Binary to Hex String	The hex string	The binary

base64_encode('some val') = 'c29tZSB2YWw='
base64_decode('c29tZSB2YWw=') = 'some val'
json_encode(json_decode( '{ "a" : 1 }' )) = '{"a":1}'
bin2hexstr(hexstr2bin('ABEF123')) = 'ABEF123'

Function	Purpose	Parameters	Returned value
schema_encode	Encode according to schema. The schema should be created before using this function	1. The Schema ID defined by schema registry 2. The data to be encoded 3..N. The remaining arguments according to the schema type	The encoded data
schema_decode	Decode according to schema. The schema should be created before using this function	1. The Schema ID defined by schema registry 2. The data to be decoded 3..N. The remaining arguments according to the schema type	The decoded data

For examples of schema_encode() and schema_decode(), see schema registry {% endemqxee %}

Time and date functions

Function	Purpose	Parameters	Returned value
now_timestamp	Return the unix epoch of now in second	-	The unix epoch
now_timestamp	Return the unix epoch of now, in given time unit	1. The time unit	The unix epoch
now_rfc3339	Create a RFC3339 time string of now in second	-	The time string of format RFC3339
now_rfc3339	Create a RFC3339 time string of now, in given time unit	1. The time unit	The time string of format RFC3339
unix_ts_to_rfc3339	Convert an unix epoch (in second) to RFC3339 time string	1. The unix epoch in second	The time string of format RFC3339
unix_ts_to_rfc3339	Convert an unix epoch to RFC3339 time string, using the given time unit	1. The unix epoch 2. The time unit	The time string of format RFC3339
rfc3339_to_unix_ts	Convert a RFC3339 time string (in second) to unix epoch	1. The time string of format RFC3339	The unix epoch
rfc3339_to_unix_ts	Convert a RFC3339 time string to unix epoch, using the given time unit	1. The time string of format RFC3339 2. The time unit	The unix epoch
format_date	Timestamp to formatted time	1. The time unit (refer to The time unit) 2. The time offset (refer to time offset definition) 3. The date format (refer to time string codec format) 4. The timestamp (optional parameter, default is current time)	Formatted time
date_to_unix_ts	Formatted time to timestamp	1. The time unit (refer to the following table for definition) 2. The time offset (optional, when not filled, use the time offset in the formatted time string, refer to the time offset definition) 3. The date format (refer to time string codec format) 4. The formatted time string	The unix epoch

The time unit

Name	Precision	Example
second	second	1653557821
millisecond	millisecond	1653557852982
microsecond	microsecond	1653557892926417
nanosecond	nanosecond	1653557916474793000

Time string format

Placeholder	Definition	Range
%Y	year	0000 - 9999
%m	month	01 - 12
%d	day	01 - 31
%H	hour	00 - 12
%M	minute	00 - 59
%S	second	01 - 59
%N	nanosecond	000000000 - 999999999
%3N	millisecond	000000 - 999999
%6N	microsecond	000 - 000
%z	time offset [+|-]HHMM	-1159 to +1159
%:z	time offset [+|-]HH:MM	-11:59 to +11:59
%::z	time offset [+|-]HH:MM:SS	-11:59:59 to +11:59:59

The time offset

Offset	Definition	Examples
z	UTC Zulu Time	+00:00
Z	UTC Zulu Time. Same as z	+00:00
local	System Time	Automatic Beijing +08:00 Zulu +00:00 Stockholm, Sweden +02:00 Los Angeles -08:00
[+|-]HHMM	%z	Beijing +0800 Zulu +0000 Stockholm, Sweden +0200 Los Angeles -0800
[+|-]HH:MM	%:z	Beijing +08:00 Zulu +00:00 Stockholm, Sweden +02:00 Los Angeles -08:00
[+|-]HH:MM:SS	%::z	Beijing +08:00:00 Zulu +00:00:00 Stockholm, Sweden +02:00:00 Los Angeles -08:00:00
integer()	Seconds	Beijing 28800 Zulu 0 Stockholm, Sweden 7200 Los Angeles -28800

now_timestamp() = 1650874276
now_timestamp('millisecond') = 1650874318331
now_rfc3339() = '2022-04-25T16:08:41+08:00'
now_rfc3339('millisecond') = '2022-04-25T16:10:10.652+08:00'
unix_ts_to_rfc3339(1650874276) = '2022-04-25T16:11:16+08:00'
unix_ts_to_rfc3339(1650874318331, 'millisecond') = '2022-04-25T16:11:58.331+08:00'
rfc3339_to_unix_ts('2022-04-25T16:11:16+08:00') = 1650874276
rfc3339_to_unix_ts('2022-04-25T16:11:58.331+08:00', 'millisecond') = 1650874318331
format_date('second', '+0800', '%Y-%m-%d %H:%M:%S%:z', 1653561612) = '2022-05-26 18:40:12+08:00'
format_date('second', 'local', '%Y-%m-%d %H:%M:%S%:z') = "2022-05-26 18:48:01+08:00"
format_date('second', 0, '%Y-%m-%d %H:%M:%S%:z') = '2022-05-26 10:42:41+00:00'
date_to_unix_ts('second', '%Y-%m-%d %H:%M:%S%:z', '2022-05-26 18:40:12+08:00') = 1653561612
date_to_unix_ts('second', 'local', '%Y-%m-%d %H-%M-%S', '2022-05-26 18:40:12') = 1653561612
date_to_unix_ts('second', '%Y-%m-%d %H-%M-%S', '2022-05-26 10:40:12') = 1653561612

Function	Purpose	Parameters	Returned value
mongo_date	Create a mongodb ISODate type of now	-	the ISODate
mongo_date	Create a mongodb ISODate type from the given unix epoch in millisecond	1. unix epoch in millisecond	the ISODate
mongo_date	Create a mongodb ISODate type from the given unix epoch in given time unit	1. unix epoch 2. time unit, can be one of 'second', 'millisecond', 'microsecond' or 'nanosecond'	the ISODate

The time unit can be one of 'second', 'millisecond', 'microsecond' or 'nanosecond'.

mongo_date() = 'ISODate("2012-12-19T06:01:17.171Z")'
mongo_date(timestamp) = 'ISODate("2012-12-19T06:01:17.171Z")'
mongo_date(timestamp, 'millisecond') = 'ISODate("2012-12-19T06:01:17.171Z")'