Bohdan Siryk created CASSGO-105:
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Summary: Nil pointer dereference in compileMetadata when custom
aggregate has no final func defined
Key: CASSGO-105
URL: https://issues.apache.org/jira/browse/CASSGO-105
Project: Apache Cassandra Go driver
Issue Type: Bug
Reporter: Bohdan Siryk
A nil pointer dereference occurs when a custom aggregate is defined without a
FINALFUNC. Cassandra states that the final func is optional, so Gocql should
correctly handle such a case.
Discovered during the implementation of CASSGO-101.
The root cause is [this piece of
code|https://github.com/apache/cassandra-gocql-driver/blob/f1e31a58f7e0c25e58e2e2a0a0c6de358e643e8b/metadata.go#L362],
which tries to get function metadata from the Functions map by finalFunc name.
As there is no final function for the created aggregate,
_AggregateMetadata.finalFunc_ is an empty string. Trying to get the function
metadata from _KeyspaceMetadata.Functions_ map by that empty string value
result in a return of a nil value, which is being dereferenced after.
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