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https://issues.apache.org/jira/browse/CASSANDRA-7744?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14094948#comment-14094948
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Aleksey Yeschenko commented on CASSANDRA-7744:
----------------------------------------------
Well, no, it has nothing to do with CreateTableStatement, being CliTest, and
everything to do with Thrift.
The following sequence is enough to reproduce:
{code}
create column family test with comparator=UTF8Type and column_metadata=[{
column_name:test, validation_class:BytesType}];
update column family test with comparator=UTF8Type and column_metadata=[];
{code}
The CF remains sparse after the update, but the automatically added clustering
column is now OOB because of
{code}
int nbCkCols = isDense
? comparator.componentsCount()
: comparator.componentsCount() - (hasCollection() ? 2 : 1);
{code}
Problem is of course that CFMetaData#fromThriftForUpdate() called
CFMetaData#rebuild() which didn't know yet at that stage about the old CF being
sparse, so it auto-created a clustering column thinking it was dense.
So it's the inverse, really - the bug caused by the value not persisting. The
table turns from sparse to dense in the end.
Several ways to deal with this - from rejecting updates like this (we don't
allow removing columns from COMPACT STORAGE via CQL3, this would be
consistent), to making sure that sparseness/denseness always persists through
updates via Thrift.
> Dropping the last collection column turns
> CompoundSparseCellNameType$WithCollection into CompoundDenseCellNameType
> ------------------------------------------------------------------------------------------------------------------
>
> Key: CASSANDRA-7744
> URL: https://issues.apache.org/jira/browse/CASSANDRA-7744
> Project: Cassandra
> Issue Type: Bug
> Reporter: Aleksey Yeschenko
> Assignee: Sylvain Lebresne
> Fix For: 2.0.10, 2.1.0
>
> Attachments: 7744.txt
>
>
> Dropping the last collection column turns
> CompoundSparseCellNameType$WithCollection into CompoundDenseCellNameType
> To reproduce
> {code}
> cqlsh:test> create table test (id int primary key, col map<int,int>);
> cqlsh:test> alter table test drop col;
> cqlsh:test> alter table test add col list<int>;
> code=2200 [Invalid query] message="Cannot add new column to a COMPACT STORAGE
> table"
> {code}
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