Paul Ayers created CASSANDRA-18760:
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Summary: Need to block the ability to DROP table column of 'map'
type and add back as 'blob' type
Key: CASSANDRA-18760
URL: https://issues.apache.org/jira/browse/CASSANDRA-18760
Project: Cassandra
Issue Type: Bug
Reporter: Paul Ayers
Recently hit an uncoverable situation after dropping a 'map' column and adding
it back as a 'blob', which caused corruption that neither offline nor online
scrub could fix.
When moving dropping a 'blob' column and attempting to add it back as a 'map'
type, the operation is blocked with:
{code:java}
InvalidRequest: Error from server: code=2200 [Invalid query] message="Cannot
re-add previously dropped column 'col1' of type map<int, tinyint>, incompatible
with previous type blob"
{code}
We need to do the same going from 'map' to 'blob' to avoid this potentially
very bad scenario that can cause data loss.
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