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Description
Describe the bug
Some products refer to this type of functions as "non-materializable" functions, meaning that they are disallowed in CREATE MATERIALIZED VIEW statements. We'll also need to take care of such misuse.
dev=> create materialized view mv as select current_user();
CREATE_MATERIALIZED_VIEW
The current_user in the above MV doesn't change when switching the user.
Error message/log
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To Reproduce
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Expected behavior
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How did you deploy RisingWave?
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The version of RisingWave
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Additional context
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