Change Metadata Digest for Tables Supporting Empy Extraction#458
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This PR adds to metadata digest a constant identifier for tables that support empty extraction, i.e., tables for which it may happen that there are no values to be extracted for a given block. This identifier allows to prevent the prover from using the special empty extraction circuit (which allows to claim that were no values extracted in a given block) in tables where it can never happen that there are no values to be extracted.