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>
21d758020a