.alter function command
Alters an existing function and stores it inside the database metadata.
Rules for parameter types and CSL statements are the same as for let
statements.
Permissions
You must have at least Function Admin permissions to run this command. The principal that creates the function is automatically made a Function Admin.
Syntax
.alter
function
[ with
(
propertyName =
propertyValue [,
...])
] functionName(
parameters)
{
body }
Learn more about syntax conventions.
Parameters
Name | Type | Required | Description |
---|---|---|---|
functionName | string |
✔️ | The name of the function to alter. |
propertyName, propertyValue | string |
A comma-separated list of key-value property pairs. See supported properties. | |
parameters | string |
A comma-separated list of parameters required by the function. The format for each parameter must be ParameterName: ParameterDataType. |
|
body | string |
✔️ | Zero or more let statements followed by a valid CSL expression that is evaluated upon function invocation. |
Note
- If the function doesn't exist, an error is returned. For creating a new function, see
.create function
- Not all Kusto types are supported in
let
statements. Supported types are: string, long, datetime, timespan, and double.
Supported properties
Name | Type | Description |
---|---|---|
docstring |
string |
A description of the function for UI purposes. |
folder |
string |
The name of a folder used for UI functions categorization. |
skipvalidation |
bool |
Determines whether or not to skip semantic validation of the function. This is useful when functions are created in an incorrect order and F1 that uses F2 is created earlier. |
Example
.alter function
with (docstring = 'Demo function with parameter', folder='MyFolder')
MyFunction2(myLimit: long) {StormEvents | take myLimit}
Name | Parameters | Body | Folder | DocString |
---|---|---|---|---|
MyFunction2 | (myLimit: long) | {StormEvents | take myLimit} | MyFolder | Demo function with parameter |
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