Paul Rogers created DRILL-6043:
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Summary: Nullable vector, but not List vector, adds its internal
vectors to child list
Key: DRILL-6043
URL: https://issues.apache.org/jira/browse/DRILL-6043
Project: Apache Drill
Issue Type: Bug
Affects Versions: 1.10.0
Reporter: Paul Rogers
Priority: Minor
Each Drill vector has associated metadata in the form of a {{MaterializeField}}
instance. The {{MaterializeField}} contains a list of children. For a Map
vector, the list of children lists the vectors that make up the map.
Nullable vectors use the list of children to identify the hidden vectors that
make up the nullable vectors: {{$bits$}} and {{$values$}}.
However, repeated vectors (including lists) also have hidden internal vectors:
offsets and values. However, the metadata for repeated types and lists do not
include these in the vector metadata.
We should decide if we need metadata for the implied internal vectors. (Having
it does cause problems since a newly-created schema for a nullable vector is
not equal to the actual schema created by the vector itself.)
If we don't need the internal vector metadata, remove it from the nullable
vectors.
But, if we do need it, add it to the repeated vectors and to lists.
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