[refactor](variant) refactor sub path push down on variant type (#36478) #36923
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…he#36478) pick from master apache#36478 intro a new rule VARIANT_SUB_PATH_PRUNING to prune variant sub path. for example, variant slot v in table t has two sub path: 'c1' and 'c2', after this rule, select v['c1'] from t will only scan one sub path 'c1' of v to reduce scan time. This rule accomplishes all the work using two components. The Collector traverses from the top down, collecting all the element_at functions on the variant types, and recording the required path from the original variant slot to the current element_at. The Replacer traverses from the bottom up, generating the slots for the required sub path on scan, union, and cte consumer. Then, it replaces the element_at with the corresponding slot.
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pick from master #36478
intro a new rule VARIANT_SUB_PATH_PRUNING to prune variant sub path.
for example, variant slot v in table t has two sub path: 'c1' and 'c2', after this rule, select v['c1'] from t will only scan one sub path 'c1' of v to reduce scan time.
This rule accomplishes all the work using two components. The Collector traverses from the top down, collecting all the element_at functions on the variant types, and recording the required path from the original variant slot to the current element_at. The Replacer traverses from the bottom up, generating the slots for the required sub path on scan, union, and cte consumer. Then, it replaces the element_at with the corresponding slot.