[DRILL-1741] kvgen does not work with nested map/unions

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 0.7.0
• Fix Version/s: 0.7.0
• Component/s: Functions - Drill
• Assignee: Chun Chang
• Reporter: Hao Zhu
• Created: 17/Nov/14 23:00
• Updated: 28/Apr/15 22:19
• Resolved: 25/Nov/14 02:14

Description

Tested on latest 0.7.0.

kvgen function does not work well with nested maps/unions.

1. This works fine:

$ cat test_work.json
{
  "data" : {
    "col1" :  "aaa"
  }
}

 
0: jdbc:drill:zk=local> select kvgen(tab.data) from `test_work.json` tab;
+------------+
|   EXPR$0   |
+------------+
| [{"key":"col1","value":"aaa"}] |
+------------+
1 row selected (0.034 seconds)

2. This failed:

$ cat test7.json
{
  "data" : {
    "col1" : {
      "one" : "aaa" 
    }
  }
}

0: jdbc:drill:zk=local> select kvgen(tab.data) from `test7.json` tab;
+------------+
|   EXPR$0   |
+------------+
Query failed: Failure while running fragment., Mappify does not support input of type: MAP [ d2bfea52-9935-4d63-8ecc-52315a3c7c7b on 10.250.0.115:31010 ]


java.lang.RuntimeException: java.sql.SQLException: Failure while executing query.
	at sqlline.SqlLine$IncrementalRows.hasNext(SqlLine.java:2514)
	at sqlline.SqlLine$TableOutputFormat.print(SqlLine.java:2148)
	at sqlline.SqlLine.print(SqlLine.java:1809)
	at sqlline.SqlLine$Commands.execute(SqlLine.java:3766)
	at sqlline.SqlLine$Commands.sql(SqlLine.java:3663)
	at sqlline.SqlLine.dispatch(SqlLine.java:889)
	at sqlline.SqlLine.begin(SqlLine.java:763)
	at sqlline.SqlLine.start(SqlLine.java:498)
	at sqlline.SqlLine.main(SqlLine.java:460)