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/**
* Test that an $expr predicated which is eligible for being indexed with an $or pushdown executes
* as expected.
*/
(function() {
"use strict";
const coll = db.expr_or_pushdown;
coll.drop();
assert.commandWorked(coll.createIndex({"a": 1, "b": 1}));
assert.commandWorked(coll.insert({_id: 0, a: "a", b: "b", d: "d"}));
assert.commandWorked(coll.insert({_id: 1, a: "a", b: "c", d: "d"}));
assert.commandWorked(coll.insert({_id: 2, a: "a", b: "x", d: "d"}));
assert.commandWorked(coll.insert({_id: 3, a: "x", b: "b", d: "d"}));
assert.commandWorked(coll.insert({_id: 4, a: "a", b: "b", d: "x"}));
const results = coll.find({
$expr: {$and: [{$eq: ["$d", "d"]}, {$eq: ["$a", "a"]}]},
$or: [{"b": "b"}, {"b": "c"}]
})
.sort({_id: 1})
.toArray();
assert.eq(results, [{_id: 0, a: "a", b: "b", d: "d"}, {_id: 1, a: "a", b: "c", d: "d"}]);
}());
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