Avoid cloning prepared metadata fields #982
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PreparedMetadata contains a bunch of allocating fields we dont actually use like
col_specsandglobal_table_spec.table_name.So I created a cut down version of PreparedMetadata to save 2 clones of these unused allocations.
This saves ~0.5% in the flamegraph but this would have an even larger affect when the col_specs field has more complicated values in it.