# \#experimental

**URL:** https://forum.scylladb.com/tag/experimental/92.md

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## [User defined Queries are not working in ScyllaDb Enterprise CQL shell and through an error I mentioned in description](https://forum.scylladb.com/t/user-defined-queries-are-not-working-in-scylladb-enterprise-cql-shell-and-through-an-error-i-mentioned-in-description/1224)

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**Author:** [@subrato](https://forum.scylladb.com/u/subrato)\
**Replies:** 24\
**Last updated:** [February 20, 2024, 9:48am UTC](https://forum.scylladb.com/t/user-defined-queries-are-not-working-in-scylladb-enterprise-cql-shell-and-through-an-error-i-mentioned-in-description/1224 "2024-02-20T09:48:41Z")

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CREATE OR REPLACE FUNCTION div(dividend double, divisor double) RETURNS NULL ON NULL INPUT RETURNS double LANGUAGE LUA AS 'return dividend/divisor;'; InvalidRequest: Error from server: code=2200 \[Invalid query\] …

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## [Node failed to join the cluster when I use the experimental feature "consistent-topology-changes"](https://forum.scylladb.com/t/node-failed-to-join-the-cluster-when-i-use-the-experimental-feature-consistent-topology-changes/1203)

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**Author:** [@vincent](https://forum.scylladb.com/u/vincent)\
**Replies:** 2\
**Last updated:** [January 19, 2024, 3:20am UTC](https://forum.scylladb.com/t/node-failed-to-join-the-cluster-when-i-use-the-experimental-feature-consistent-topology-changes/1203 "2024-01-19T03:20:48Z")

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Now I am starting a cluster with experimental feature “consistent-topology-changes” . For the first eleven nodes , I enabled the experimental feature successfully . However , when it comes to the twelve node , it failed …

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## [Does experimental feature \`consistent-topology-changes\` support online modification?](https://forum.scylladb.com/t/does-experimental-feature-consistent-topology-changes-support-online-modification/1200)

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**Author:** [@bo\_li](https://forum.scylladb.com/u/bo_li)\
**Replies:** 1\
**Last updated:** [January 16, 2024, 9:26am UTC](https://forum.scylladb.com/t/does-experimental-feature-consistent-topology-changes-support-online-modification/1200 "2024-01-16T09:26:28Z")

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Now I have a up and normal 5.4.0 cluster. After adding configuration consistent-topology-changes to them, only the seed node is functioning properly. The other two nodes are not displayed in the cluster, but their lo…