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// Basic validation of explain output fields.
t = db.jstests_explain4;
t.drop();
function checkField( explain, name, value ) {
assert( explain.hasOwnProperty( name ) );
if ( value != null ) {
assert.eq( value, explain[ name ], name );
// Check that the value is of the expected type. SERVER-5288
assert.eq( typeof( value ), typeof( explain[ name ] ), 'type ' + name );
}
}
function checkNonCursorPlanFields( explain, matches, n ) {
checkField( explain, "n", n );
checkField( explain, "nscannedObjects", matches );
checkField( explain, "nscanned", matches );
}
function checkPlanFields( explain, matches, n ) {
checkField( explain, "cursor", "BasicCursor" );
// index related fields do not appear in non-indexed plan
assert(!("indexBounds" in explain));
checkNonCursorPlanFields( explain, matches, n );
}
function checkFields( matches, sort, limit ) {
cursor = t.find();
if ( sort ) {
print("sort is {a:1}");
cursor.sort({a:1});
}
if ( limit ) {
print("limit = " + limit);
cursor.limit( limit );
}
explain = cursor.explain( true );
printjson( explain );
checkPlanFields( explain, matches, matches > 0 ? 1 : 0 );
checkField( explain, "scanAndOrder", sort );
checkField( explain, "millis" );
checkField( explain, "nYields" );
checkField( explain, "nChunkSkips", 0 );
checkField( explain, "isMultiKey", false );
checkField( explain, "indexOnly", false );
checkField( explain, "server" );
checkField( explain, "allPlans" );
explain.allPlans.forEach( function( x ) { checkPlanFields( x, matches, matches ); } );
}
checkFields( 0, false );
// If there's nothing in the collection, there's no point in verifying that a sort
// is done.
// checkFields( 0, true );
t.save( {} );
checkFields( 1, false );
checkFields( 1, true );
t.save( {} );
checkFields( 1, false, 1 );
// Check basic fields with multiple clauses.
t.save( { _id:0 } );
explain = t.find( { $or:[ { _id:0 }, { _id:1 } ] } ).explain( true );
checkNonCursorPlanFields( explain, 1, 1 );
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