WIP: different mvcc column approach #51350
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Fixes cockroachdb#50102. This PR adds introspection into the KV layer's concurrency control from the SQL level. In particular, we now expose the MVCC HLC timestamp of a row as a special system column on every table. This system column is exposed as a decimal, and is computed as `wall time * 10^10 + logical time`. To accomplish this, this PR adds planning and execution infrastructure for implicit system columns that can be produced by the execution layer for a particular row. Release note (sql change): Expose the MVCC timestamp of each row as a system column on tables.
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Fixes #50102.
This PR adds introspection into the KV layer's concurrency control from
the SQL level. In particular, we now expose the MVCC HLC timestamp of a
row as a special system column on every table. This system column is
exposed as a decimal, and is computed as
wall time * 10^10 + logical time.To accomplish this, this PR adds planning and execution infrastructure
for implicit system columns that can be produced by the execution layer
for a particular row.
Release note (sql change): Expose the MVCC timestamp of each row as a
system column on tables.