Commits on Mar 9, 2019

1. sql: provide table comments on virtual tables …

   This patch adds a `comment` to `virtualSchemaTable` and exposes it
   through a new virtual table `crdb_internal.predefined_comments`.
   
   This is then used by `pg_catalog.pg_description` to expose comments on
   virtual tables alongside those of real tables. This way
   `obj_description()` works on virtual tables too.
   
   Finally it modifies `SHOW TABLES WITH COMMENT` to use `pg_description`
   and expose the table comments.
   
   Release note (sql change): CockroachDB now provides usable comments
   with optional documentation URLs for the virtual tables in
   `pg_catalog`, `information_schema` and `crdb_internal`. Use `SHOW
   TABLES [FROM ...] WITH COMMENT` to read. Note that `crdb_internal`
   tables remain an experimental feature subject to change without
   notice.

   

   hueypark authored and knz committed Mar 9, 2019
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