Tugdual Grall created DRILL-3443:
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Summary: Flatten function raise exception when JSON files have
different schema
Key: DRILL-3443
URL: https://issues.apache.org/jira/browse/DRILL-3443
Project: Apache Drill
Issue Type: Bug
Components: Execution - Data Types
Affects Versions: 1.0.0
Environment: DRILL 1.0 Embedded (running on OSX with Java 8)
DRILL 1.0 Deployed on MapR 4.1 Sandbox
Reporter: Tugdual Grall
Assignee: Daniel Barclay (Drill)
Priority: Critical
I have 2 JSON documents:
{code}
{
"name" : "PPRODUCT_002",
"price" : 200.00,
"tags" : ["sports" , "cool", "ocean"]
}
{
"name" : "PPRODUCT_001",
"price" : 100.00
}
{code}
And I execute this query:
{code}
SELECT name, flatten(tags)
FROM dfs.`data/json_array/*.json`
{code}
If the JSON Documents are located in 2 different files and the first file does
not contains the "tags" (product 001 in 001.json ), the following exception is
raised:
{code}
org.apache.drill.common.exceptions.UserRemoteException: SYSTEM ERROR:
java.lang.ClassCastException: Cannot cast
org.apache.drill.exec.vector.NullableIntVector to
org.apache.drill.exec.vector.RepeatedValueVector Fragment 0:0 [Error Id:
4bb5b9e4-0de1-48e9-a0f3-956339608903 on 192.168.99.13:31010]
{code}
It is working if:
* All the JSON documents are in a single json file (order is not important)
* if the product with the tags attribute is "first" on the file system, for
example you put product 02 in 000.json (that will be read before 001.json)
This is similar to [DRILL-3334] bug
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