Sorabh Hamirwasia created DRILL-6172:
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Summary: setValueCount of VariableLengthVectors throws IOB
exception when called with 0 value after clearing vectors
Key: DRILL-6172
URL: https://issues.apache.org/jira/browse/DRILL-6172
Project: Apache Drill
Issue Type: Bug
Reporter: Sorabh Hamirwasia
Assignee: Sorabh Hamirwasia
Fix For: 1.13.0
For VariableLengthVectors when we call *setValueCount* explicitly after
clearing off the vector memory then it throws IOB exception. Normally
*setValueCount* is not required to be called explicitly after clear, since
getValueCount will return correct information. But if called it currently
throws IOB which should not be the case.
The reason being when clear is called then it releases both offsetVector and
dataVector memory(or DrillByteBuf). Later when setValueCount is called then it
tries to get current value in offset vector at that valueCount index and fails
since the length of offset vector is zero. [Reference to
code|https://github.com/apache/drill/blob/master/exec/vector/src/main/codegen/templates/VariableLengthVectors.java#L703].
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