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// Basic validation of explain output fields
t = db.jstests_explain4;
t.drop();
function checkField( name, value ) {
assert( explain.hasOwnProperty( name ) );
if ( value != null ) {
assert.eq( value, explain[ name ], name );
}
}
function checkPlanFields( explain, matches, n ) {
checkField( "cursor", "BasicCursor" );
checkField( "n", n );
checkField( "nscannedObjects", matches );
checkField( "nscanned", matches );
checkField( "indexBounds", {} );
}
function checkFields( matches, sort, limit ) {
it = t.find();
if ( sort ) {
it.sort({a:1});
}
if ( limit ) {
it.limit( limit );
}
explain = it.explain( true );
// printjson( explain );
checkPlanFields( explain, matches, matches > 0 ? 1 : 0 );
checkField( "scanAndOrder", sort );
checkField( "millis" );
checkField( "nYields" );
checkField( "nChunkSkips", 0 );
checkField( "isMultiKey", false );
checkField( "indexOnly", false );
checkField( "server" );
checkField( "allPlans" );
explain.allPlans.forEach( function( x ) { checkPlanFields( x, matches ); } );
}
checkFields( 0, false );
checkFields( 0, true );
t.save( {} );
checkFields( 1, false );
checkFields( 1, true );
t.save( {} );
checkFields( 1, false, 1 );
checkFields( 2, true, 1 );
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