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b7926dfe7c
This PR adds a regex cache to `ProgramState` so that we ca re-use already constructed regexes while processing LIKE expressions. I didn't find anywhere else that seemed like a good fit to put an execution-time only cache like this, so let me know if there's a better spot. To best match sqlite, I added the constant mask into the `Function` instruction (this indicates whether the first argument to the function was determined to be constant at compile time), and decide whether to use the cache based on its value. I've left the value for `constant_mask` as 0 on every other kind of `Function` instruction. That seemed to be the safest choice, as that appears to be what has been implicitly done up to this point. Happy to change that if you'd advise otherwise. Fixes #168 Closes #320