[jira] [Created] (DRILL-1689) Drill could not query a repeated map, and get all the values of one field into an array.

["Jinfeng Ni (JIRA)" <ji...@apache.org>]

Jinfeng Ni created DRILL-1689:
---------------------------------

             Summary: Drill could not query a repeated map, and get all the values of one field into an array. 
                 Key: DRILL-1689
                 URL: https://issues.apache.org/jira/browse/DRILL-1689
             Project: Apache Drill
          Issue Type: Bug
            Reporter: Jinfeng Ni


Suppose we have the following JSON data:

{code}
{
    "uid" : 1,
    "events" : [
        { "evnt_id":"e1", "campaign_id":"c1", "event_name":"e1_name", "event_time":1000000},
        { "evnt_id":"e2", "campaign_id":"c1", "event_name":"e2_name", "event_time":2000000},
        { "evnt_id":"e3", "campaign_id":"c1", "event_name":"e3_name", "event_time":3000000},
        { "evnt_id":"e4", "campaign_id":"c1", "event_name":"e4_name", "event_time":4000000},
        { "evnt_id":"e5", "campaign_id":"c2", "event_name":"e5_name", "event_time":5000000},
        { "evnt_id":"e6", "campaign_id":"c1", "event_name":"e6_name", "event_time":6000000},
        { "evnt_id":"e7", "campaign_id":"c1", "event_name":"e7_name", "event_time":7000000},
        { "evnt_id":"e8", "campaign_id":"c2", "event_name":"e8_name", "event_time":8000000},
        { "evnt_id":"e9", "campaign_id":"c2", "event_name":"e9_name", "event_time":9000000}
    ],
   "transactions" : [
        { "trans_id":"t1", "amount":100, "trans_time":7777777},
        { "trans_id":"t2", "amount":100, "trans_time":8888888}
    ]
}
{code}

"transactions" is repeated map.  We could return a field "trans_id" in i-th map in this repeated map. 

{code}
select t.transactions[1].trans_id from dfs.`/Users/jni/work/data/json/single-user-transactions.json` t;
+------------+
|   EXPR$0   |
+------------+
| t2         |
+------------+
{code}

However, if we want to get  field "trans_id" from "ALL" the maps in this array, Drill will fail with exception:

{code}
select t.transactions.trans_id from dfs.`/Users/jni/work/data/json/single-user-transactions.json` t;
Query failed: Failure while running fragment., org.apache.drill.exec.vector.complex.RepeatedMapVector cannot be cast to org.apache.drill.exec.vector.complex.MapVector [ 1317f855-b33a-4023-9164-3f22e7e8f1bf on 10.250.0.112:31013 ]
{code}

For the above query, SchemaPath "t.transactions.trans_id" should return an array of "trans_id", i.e ["t1", "t2"].







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