Querying on key of a Map in Aerospike - aerospike

Question

I'm trying to store a map in aerospike and fetch the data based on the key of the map.
First I created a Index on the bin where i'm storing the map
aql> create mapkeys index status on test.myset (state) String
aql> show indexes
+--------+---------+-----------+---------+-------+-----------+---------+------------+----------+
| ns | bin | indextype | set | state | indexname | path | sync_state | type |
+--------+---------+-----------+---------+-------+-----------+---------+------------+----------+
| "test" | "state" | "MAPKEYS" | "myset" | "RW" | "status" | "state" | "synced" | "STRING" |
+--------+---------+-----------+---------+-------+-----------+---------+------------+----------+
1 row in set (0.000 secs)
OK
Then I used java client to store the map
AerospikeClient client = new AerospikeClient("127.0.0.1",3000);
WritePolicy writePolicy = new WritePolicy();
writePolicy.timeout=500;
for(int i = 1;i<10;i++){
Key key = new Key("test","myset",""+i);
client.delete(writePolicy, key);
HashMap<String,String> map = new HashMap<String,String>();
map.put("key1", "string1");
map.put("key2", "string2");
map.put("key3", "string3");
Bin bin = new Bin("state", map);
client.put(writePolicy, key, bin);
}
I checked the data through apl and the data is clearly present.
aql> select * from test.myset
+--------------------------------------------------------+
| state |
+--------------------------------------------------------+
| {"key1":"string1", "key2":"string2", "key3":"string3"} |
| {"key1":"string1", "key2":"string2", "key3":"string3"} |
| {"key1":"string1", "key2":"string2", "key3":"string3"} |
| {"key1":"string1", "key2":"string2", "key3":"string3"} |
| {"key1":"string1", "key2":"string2", "key3":"string3"} |
| {"key1":"string1", "key2":"string2", "key3":"string3"} |
| {"key1":"string1", "key2":"string2", "key3":"string3"} |
| {"key1":"string1", "key2":"string2", "key3":"string3"} |
| {"key1":"string1", "key2":"string2", "key3":"string3"} |
| {"key1":"string1", "key2":"string2", "key3":"string3"} |
+--------------------------------------------------------+
10 rows in set (0.019 secs)
Now when I try to query based on the index created it gives
aql> select * from test.myset where status = 'key1'
0 rows in set (0.000 secs)
Error: (204) AEROSPIKE_ERR_INDEX
aql> select * from test.myset where state = 'key1'
0 rows in set (0.000 secs)
Error: (201) AEROSPIKE_ERR_INDEX_NOT_FOUND
Can someone help me with this. I searched for that error but found no information. Thank you.

Answer 1

Secondary indexes on MapKeys, MapValues, Lists are supported by Aerospike, apart from Numeric, String and Geo2DSphere types.
For your scenario, you can query on the Mapkey as follows.
select * from test.myset in mapkeys where state='key1'
This should return the results.
In AQL, if you type help, you should get the following for queries
SELECT <bins> FROM <ns>[.<set>]
SELECT <bins> FROM <ns>[.<set>] WHERE <bin> = <value>
SELECT <bins> FROM <ns>[.<set>] WHERE <bin> BETWEEN <lower> AND <upper>
SELECT <bins> FROM <ns>[.<set>] WHERE PK = <key>
SELECT <bins> FROM <ns>[.<set>] IN <indextype> WHERE <bin> = <value>
SELECT <bins> FROM <ns>[.<set>] IN <indextype> WHERE <bin> BETWEEN <lower> AND <upper>
Similarly, you can run a query for the MapValue as well.

Answer 2

Update:
As of Aerospike 3.8.1, Secondary Index on List and Map are officially supported.
Original Response:
Query by secondary index on map keys, map values, or list values are
not officially supported yet.
That said, the functionality and syntax is somewhat available. You need to:
Create a secondary index with type MAPKEYS, MAPVALUES or LIST (you're using type STRING at the moment)
Select as follows (you're missing the IN MAPKEYS part):
SELECT * FROM namespace.setname IN MAPKEYS WHERE bin = 'keyValue'
The query syntax, as well as some other bits, is available if you type help while in the AQL console.