Comments - Maximum number of IN
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https://jira.mariadb.org/browse/MCOL-4800
Columnstore converts IN with literals into a tree of predicates column = VAL1 OR column = VAL2 and sends it over the network. There is an internal limit for a depth for such tree. It corresponds with a number of bytes used to encode the tree and the upper limit for the encoded tree is 65,535 bytes.