 a failed <TT
CLASS="COMMAND"
>CREATE INDEX
      CONCURRENTLY</TT
> command.  The most important of these is
      <TT
CLASS="COMMAND"
>VACUUM</TT
>, because an auto-vacuum could easily be launched
      on the table before corrective action can be taken to fix or remove
      the invalid index.
     </P
><P
>      Also fix <TT
CLASS="COMMAND"
>DROP INDEX CONCURRENTLY</TT
> to not disable
      insertions into the target index until all queries using it are done.
     </P
><P
>      Also fix misbehavior if