[DRILL-3501] No vector has initialized when the value of qualifier is null while using Hbase storage

• Type: Bug
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Affects Version/s: 0.9.0, 1.0.0, 1.1.0
• Component/s: Storage - HBase
• Assignee: Unassigned
• Reporter: 徐波
• Created: 16/Jul/15 03:13
• Updated: 13/Aug/15 09:14

Description

drill throws exception while querying from hbase：
Failure while reading vector. Expected vector class of org.apache.drill.exec.vector.NullableVarBinaryVector but was holding vector class org.apache.drill.exec.vector.NullableIntVector.

My sql:
select t2.A.A1, t2.A.B2 from hdfs.root.`table1` as t1 inner join hbase.`table2` as t2 on table1.c1=t2.c1

Now the table2 has 3 regions and A.B2 on the last region is null while containing values on the other regions. The node creates a NullableIntVector while quering from the last region,but the nodes create a NullableVarBinaryVector while quering from the other regions.So drill throws Exception on the join node which get two type of vector for one column.

I recommend that we should initialize vector for selected columns in the method named 'org.apache.drill.exec.store.hbase.HBaseRecordReader.setup'