arangosh> db.test.ensureIndex({ type: "hash", fields: [ "a[*]" ] });
{
"deduplicate" : true,
"fields" : [
"a[*]"
],
"id" : "test/15364",
"isNewlyCreated" : true,
"selectivityEstimate" : 1,
"sparse" : false,
"type" : "hash",
"unique" : false,
"code" : 201
}
arangosh> db.test.save({ a : [ 1, 2 ] });
{
"_id" : "test/15367",
"_key" : "15367",
"_rev" : "_VOyxn8u---"
}
arangosh> db.test.save({ a : [ 1, 3 ] });
{
"_id" : "test/15371",
"_key" : "15371",
"_rev" : "_VOyxn8y---"
}
arangosh> db.test.save({ a : null });
{
"_id" : "test/15374",
"_key" : "15374",
"_rev" : "_VOyxn8y--_"
}