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Incompatible changes in ArangoDB 3.4

It is recommended to check the following list of incompatible changes before upgrading to ArangoDB 3.4, and adjust any client programs if necessary.

The following incompatible changes have been made in ArangoDB 3.4:

Client tools

REST API

GET /_api/aqlfunction/ was migrated to match the general structure of ArangoDB Replies. It now returns an object with a "result" attribute that contains the list of available AQL user functions:

	  {
	    code: 200,
		error: false,
		result: [
	      {
		    "name":"UnitTests::mytest1",
			"code":"function () { return 1; }",
			"isDeterministic":false
		}]}

In previous versions, this REST API returned only the list of available AQL user functions on the top level of the response.
Each AQL user function description now also contains the 'isDeterministic' attribute.

DELETE /_api/aqlfunction/ now returns the number of deleted functions: {code: 200, error: false, deletedCount: 10}

Miscellaneous

AQL Functions

CALL / APPLY
- may emmit ERROR_QUERY_FUNCTION_NAME_UNKNOWN or ERROR_QUERY_FUNCTION_ARGUMENT_TYPE_MISMATCH instead of ERROR_QUERY_FUNCTION_NOT_FOUND in some situations.
- are now able to be invoked recursive

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