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4ac63de063
Wire up the selection and result-set infrastructure to consume the extended collection wire format introduced in the previous patch and expose per-element timestamps and TTLs to the expression evaluator. * Add collection_cell_metadata: maps from raw element-key bytes to timestamp and remaining TTL, one entry per collection or UDT cell. Add a corresponding collection_element_metadata span to evaluation_inputs so that evaluators can access it. * Add a flag _collect_collection_timestamps to selection (selection.hh/cc). When any selected expression contains a WRITETIME(col[key])/TTL(col[key]) or WRITETIME(col.field)/TTL(col.field) attribute, the flag is set and the send_collection_timestamps partition-slice option is enabled, causing storage nodes to use the extended wire format from the previous patch. * Implement result_set_builder::add_collection() (selection.cc): when _collect_collection_timestamps is set, parse the extended format, decode per-element timestamps and remaining TTLs (computed from the stored expiry time and the query time), and store them in _collection_element_metadata indexed by column position. When the flag is not set, the existing plain-bytes path is unchanged. After this patch, the new selection feature is still not available to the end-user because the prepare step still forbids it. The next patch will finally complete the expression preparation and evaluation. It will read the new collection_element_metadata and return the correct timestamp or TTL value.