Wail Y. Alkowaileet created ASTERIXDB-3234:
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Summary: Incorrect handling of empty arrays in columnar collections
Key: ASTERIXDB-3234
URL: https://issues.apache.org/jira/browse/ASTERIXDB-3234
Project: Apache AsterixDB
Issue Type: Bug
Components: STO - Storage
Affects Versions: 0.9.9
Reporter: Wail Y. Alkowaileet
Assignee: Wail Y. Alkowaileet
Fix For: 0.9.9
Currently, columnar collections doesn't handle empty arrays correctly.
* If an array was always empty and a flush occurred, a NPE exception is thrown
{noformat}
java.lang.NullPointerException: Cannot invoke
"org.apache.asterix.column.metadata.schema.AbstractSchemaNode.serialize(java.io.DataOutput,
org.apache.asterix.column.metadata.PathInfoSerializer)" because "this.item" is
null {noformat}
* If the array item type is known but the array itself is empty, we treat it
as if the array itself is missing. This is incorrect and produces a different
result compared to the row format. Below is an example of the current output of
an empty array
{noformat}
Input: {"a" []}
Output: {} {noformat}
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