Hanifi Gunes created DRILL-1459:
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Summary: Invalid field materialization causes vectors being
created multiple times and crashes jvm in case a nested field is accessed
Key: DRILL-1459
URL: https://issues.apache.org/jira/browse/DRILL-1459
Project: Apache Drill
Issue Type: Bug
Reporter: Hanifi Gunes
Assignee: Hanifi Gunes
Currently RecordBatchLoader#load relies on MaterializedField#create to
materialize a SerializedField. However, MaterializedField#create method
disregards child fields of SerializedField so the resultant materialized field
has only the root field. Instead, child fields are added during vectorization.
Next time, we hit to RecordBatchLoader#load method, materialized field check
fails because the previous materialized field now has children but newly
materialized field does not. This misleads RecordBatchLoader#load to think that
schema has changed and to create a new vector even though schema is the same.
Additionally, running a nested query on the previously created vector instance
crashes the jvm.
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