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21d758020a
These include the following: * `currenttimestamp()` * `currenttime()` * `currentdate()` * `currenttimeuuid()` Previously, they were incorrectly marked as pure, meaning that the function is executed at "prepare" step. For functions that possibly depend on timing and random seed, this is clearly a bug. Cassandra doesn't have a notion of pure functions, so they are lazily evaluated. Make Scylla to match Cassandra behavior for these functions. Add a unit-test for a fix (excluding `currentdate()` function, because there is no way to use synthetic clock with query processor and sleeping for a whole day to demonstrate correct behavior is clearly not an option). Tests: unit(dev, debug) Signed-off-by: Pavel Solodovnikov <pa.solodovnikov@scylladb.com>