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// SERVER-10689 introduced the $switch expression. In this file, we test the error cases of the
// expression.
load("jstests/aggregation/extras/utils.js"); // For assertErrorCode.
load("jstests/libs/sbe_assert_error_override.js"); // Override error-code-checking APIs.
(function() {
"use strict";
var coll = db.switch;
coll.drop();
var pipeline = {"$project": {"output": {"$switch": "not an object"}}};
assertErrorCode(coll, pipeline, 40060, "$switch requires an object as an argument.");
pipeline = {
"$project": {"output": {"$switch": {"branches": "not an array"}}}
};
assertErrorCode(coll, pipeline, 40061, "$switch requires 'branches' to be an array.");
pipeline = {
"$project": {"output": {"$switch": {"branches": ["not an object"]}}}
};
assertErrorCode(coll, pipeline, 40062, "$switch requires each branch to be an object.");
pipeline = {
"$project": {"output": {"$switch": {"branches": [{}]}}}
};
assertErrorCode(coll, pipeline, 40064, "$switch requires each branch have a 'case'.");
pipeline = {
"$project": {
"output": {
"$switch": {
"branches": [{
"case": 1,
}]
}
}
}
};
assertErrorCode(coll, pipeline, 40065, "$switch requires each branch have a 'then'.");
pipeline = {
"$project": {"output": {"$switch": {"branches": [{"case": true, "then": false, "badKey": 1}]}}}
};
assertErrorCode(coll, pipeline, 40063, "$switch found a branch with an unknown argument");
pipeline = {
"$project": {"output": {"$switch": {"notAnArgument": 1}}}
};
assertErrorCode(coll, pipeline, 40067, "$switch found an unknown argument");
pipeline = {
"$project": {"output": {"$switch": {"branches": []}}}
};
assertErrorCode(coll, pipeline, 40068, "$switch requires at least one branch");
pipeline = {
"$project": {"output": {"$switch": {}}}
};
assertErrorCode(coll, pipeline, 40068, "$switch requires at least one branch");
assert.commandWorked(coll.insert({x: 1}));
pipeline = {
"$project": {"output": {"$switch": {"branches": [{"case": {"$eq": ["$x", 0]}, "then": 1}]}}}
};
assertErrorCode(coll, pipeline, 40066, "$switch has no default and an input matched no case");
// This query was designed to reproduce SERVER-70190. The first branch of the $switch can be
// optimized away and the $ifNull can be optimized to 2. If the field "x" exists in the input
// document and is truthy, then the expression should return 2. Otherwise it should throw because no
// case statement matched and there is no "default" expression.
pipeline = [{
$sortByCount: {
$switch: {
branches:
[{case: {$literal: false}, then: 1}, {case: "$x", then: {$ifNull: [2, "$y"]}}]
}
}
}];
assert.eq([{"_id": 2, "count": 1}], coll.aggregate(pipeline).toArray());
assert.commandWorked(coll.remove({x: 1}));
assert.commandWorked(coll.insert({z: 1}));
assertErrorCode(coll, pipeline, 40066, "$switch has no default and an input matched no case");
}());
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