Commits on Mar 30, 2023

1. sql: mark index as GCed if table has been GCed in legacy gc path …

   Previously, if a table is GCed before an index is GCed by a TRUNCATE TABLE
   gc job, the TRUNCATE TABLE gc job can be stuck in running status because
   the table descriptor is missing. This is problematic because these jobs will
   never succeed and doing nothing. This commit marks the indexes as GCed if
   the descriptor cannot be found assuming that the table has been GCed. Also,
   table GC should have GCed all the indexes.
   
   Note that this only affect the legacy GC path.
   
   Epic: None
   
   Release note (bug fix): This commit fixes a bug where TRUNCATE TABLE gc
   job can be stuck in running status if the table descriptor has been GCed.
   It was because TRUNCATE TABLE actually creates new empty indexes, then
   replaces and drops the old indexes. The dropped indexes data are deleted
   and GCed within the TRUNCATE TABLE gc job which needed to see the table
   descriptor to make progress. But, if the table data has been GCed, the
   TRUNCATE TABLE gc job couldn't make progress. This patch makes it able
   to handle the missing descriptor edge case and let the TRUNCATE TABLE
   gc job succeed.

   

   chengxiong-ruan committed Mar 30, 2023
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