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/**
* Test that $rand (and by extension, $sampleRate) doesn't get pushed down.
* @tags: [
* # Tests the 'stages' field of the explain output which is hidden beneath each shard's name when
* # run against sharded collections.
* assumes_unsharded_collection,
* # Tests the explain output, so does not work when wrapped in a facet.
* do_not_wrap_aggregations_in_facets,
* # Explicitly testing optimization.
* requires_pipeline_optimization,
* ]
*/
(function() {
"use strict";
load("jstests/libs/analyze_plan.js");
load("jstests/libs/feature_flag_util.js");
function getWinningPlanForPipeline({coll, pipeline}) {
const explain = assert.commandWorked(coll.explain().aggregate(pipeline));
if ("queryPlanner" in explain) {
return getWinningPlan(explain.queryPlanner);
}
return getWinningPlan(explain.stages[0].$cursor.queryPlanner);
}
function assertScanFilterEq({coll, pipeline, filter}) {
const winningPlan = getWinningPlanForPipeline({coll, pipeline});
const collScan = getPlanStage(winningPlan, "COLLSCAN");
assert(collScan);
// Sometimes explain will have 'filter' set to an empty object, other times there will be no
// 'filter'. If we are expecting there to be no filter on the COLLSCAN, either is acceptable.
if (filter) {
assert.docEq(filter, collScan.filter);
} else {
assert(!collScan.filter || Object.keys(collScan.filter).length == 0);
}
}
// Test that a $match with a random expression should not be pushed past a $group.
{
const coll = db[jsTestName()];
coll.drop();
let bulk = coll.initializeUnorderedBulkOp();
for (var i = 0; i < 100; i++) {
bulk.insert({a: {b: i % 5, c: i}});
}
assert.commandWorked(bulk.execute());
assertScanFilterEq({
coll,
pipeline:
[{$group: {_id: "$a.b", first: {$first: "$$CURRENT"}}}, {$match: {$sampleRate: 0.25}}]
});
assertScanFilterEq({
coll,
pipeline: [
{$group: {_id: "$a.b", first: {$first: "$$CURRENT"}}},
{$replaceRoot: {newRoot: '$first'}},
{$match: {$sampleRate: 0.25}},
]
});
assertScanFilterEq({
coll,
pipeline: [
{$group: {_id: "$a.b", first: {$first: "$$CURRENT"}}},
{$match: {$sampleRate: 0.25}},
{$replaceRoot: {newRoot: '$first'}},
]
});
assertScanFilterEq({
coll,
pipeline: [
{$match: {c: {$gt: 500}}},
{$group: {_id: "$a.b", first: {$first: "$$CURRENT"}}},
{$match: {$sampleRate: 0.25}},
],
filter: {c: {$gt: 500}}
});
assertScanFilterEq({
coll,
pipeline: [
{$match: {c: {$gt: 500}}},
// A $lookup that split $match exprs can push down past.
{
$lookup: {
as: "joinedC",
from: coll.getName(),
localField: "c",
foreignField: "c",
}
},
{
$match: {
$and: [
{$expr: {$lt: ["$c", 800]}}, // Should split me out.
{$expr: {$lt: [{$rand: {}}, {$const: 0.25}]}} // Can't split me out.
]
}
},
],
filter: {
$and: [
{c: {$gt: 500}},
{$expr: {$lt: ["$c", {$const: 800}]}},
{c: {$_internalExprLt: 800}},
]
}
});
}
// Test that a $match with a random expression should not be pushed past $_internalUnpackBucket.
{
const collName = jsTestName() + "_ts";
db[collName].drop();
assert.commandWorked(db.createCollection(collName, {
timeseries: {
timeField: "t",
metaField: "m",
}
}));
const coll = db[collName];
let bulk = coll.initializeUnorderedBulkOp();
for (var i = 0; i < 100; i++) {
bulk.insert({t: new Date(), m: i});
}
assert.commandWorked(bulk.execute());
assertScanFilterEq({
coll,
pipeline: [
{$match: {$sampleRate: 0.25}},
]
});
if (!FeatureFlagUtil.isEnabled(db, "TimeseriesScalabilityImprovements")) {
assertScanFilterEq({
coll,
pipeline: [
{
$match: {
$and: [
{$expr: {$lt: ["$m", 50]}}, // Should split me out.
{$expr: {$lt: [{$rand: {}}, {$const: 0.25}]}} // Can't split me out.
]
}
},
],
filter: {
$and: [
{$expr: {$lt: ["$meta", {$const: 50}]}},
{meta: {$_internalExprLt: 50}},
]
}
});
}
}
}());
|
