DESCRIBE FUNCTION
Shows information on user-defined functions (UDFs).
Shows this output depending on the options selected:
- All user-defined functions (UDFs) in the current keyspace.
- All UDFs in the cluster when no keyspace is selected.
- Definition as an executable CQL statement for a specific UDF.
Tip: To select a keyspace, use the USE command.
Synopsis
DESCRIBE FUNCTIONS | FUNCTION [keyspace_name.]udf_name
Syntax conventions | Description |
---|---|
UPPERCASE | Literal keyword. |
Lowercase | Not literal. |
Italics |
Variable value. Replace with a user-defined value. |
[] |
Optional. Square brackets ( [] ) surround
optional command arguments. Do not type the square brackets. |
( ) |
Group. Parentheses ( ( ) ) identify a group to
choose from. Do not type the parentheses. |
| |
Or. A vertical bar ( | ) separates alternative
elements. Type any one of the elements. Do not type the vertical
bar. |
... |
Repeatable. An ellipsis ( ... ) indicates that
you can repeat the syntax element as often as required. |
'Literal string' |
Single quotation ( ' ) marks must surround
literal strings in CQL statements. Use single quotation marks to
preserve upper case. |
{ key : value
} |
Map collection. Braces ( { } ) enclose map
collections or key value pairs. A colon separates the key and the
value. |
<datatype1,datatype2> |
Set, list, map, or tuple. Angle brackets ( <
> ) enclose data types in a set, list, map, or tuple.
Separate the data types with a comma. |
cql_statement; |
End CQL statement. A semicolon ( ; ) terminates
all CQL statements. |
[--] |
Separate the command line options from the command arguments with
two hyphens ( -- ). This syntax is useful when
arguments might be mistaken for command line options. |
' <schema> ... </schema>
' |
Search CQL only: Single quotation marks ( ' )
surround an entire XML schema declaration. |
@xml_entity='xml_entity_type' |
Search CQL only: Identify the entity and literal value to overwrite the XML element in the schema and solrConfig files. |
FUNCTIONS
- All functions.
FUNCTION
- One function.
- keyspace_name
- Name of the keyspace.
- udf_name
-
Name of the function.
Examples
List the functions in the cycling
keyspace:
USE cycling; DESC FUNCTIONS
flog(double) avgfinal(frozen<tuple<int, bigint>>)
avgstate(frozen<tuple<int, bigint>>,int) left(text,int)
Show the definition of the cycling flog
function:
DESC FUNCTION cycling.flog
CREATE FUNCTION cycling.flog(input double)
CALLED ON NULL INPUT
RETURNS double
LANGUAGE java
AS $$
return Double.valueOf(Math.log(input.doubleValue()));
$$;