Wail Y. Alkowaileet created ASTERIXDB-3482:
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Summary: NULL bit is cleared on merge & ClassCastException is
thrown when handling NULL with union
Key: ASTERIXDB-3482
URL: https://issues.apache.org/jira/browse/ASTERIXDB-3482
Project: Apache AsterixDB
Issue Type: Bug
Components: STO - Storage
Affects Versions: 0.9.9
Reporter: Wail Y. Alkowaileet
Assignee: Wail Y. Alkowaileet
Fix For: 0.9.10
NULL values in columnar storage is determined by setting the MSB of the level
where the null occurred. However, the reader clears the MSB to get the actual
level. When writing the level during the merge, the level is written without
the MSB – which can turn the null into a MISSING or an array delimiter (if the
null is in an array).
Another issue observed when adding a null value to a UNION node. The issue is
if the original node type (before it becomes a union due to type heterogeneity)
is a nested value, a ClassCastException is thrown in the ColumnTransformer.
This is due to trying to cast the nested node to a primitive one to add the
primitive value NULL.
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