Teach ArrayVTable about capabilities and let arrays provide extensible capabilities - #9371
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Teach ArrayVTable about capabilities and let arrays provide extensible capabilities#9371robert3005 wants to merge 1 commit into
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…e capabilities execute_until and Matchers provide us a mechanism for unwrapping an array tree into a known set of encodings. The Matcher is defined statically and cannot be extended if it is used as part of another mechanism. Here we introduce a way for arrays to claim the capabilities they provide, and let matchers use them as a match condition. VarBinExportable is the first such capability: it marks encodings whose append_to_builder writes byte values straight into a VarBinBuilder, which a later change uses to stop Arrow export before it canonicalizes them. Signed-off-by: Robert Kruszewski <github@robertk.io>
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execute_untilandMatchergive us a mechanism for unwrapping an array tree into a known set of encodings. AMatcheris defined statically, though, so it cannot be extended when it is used as part of another mechanism — an out-of-crate encoding has no way to join the set.This PR lets arrays claim the capabilities they provide, and lets matchers use a capability as their match condition.