Commits on Mar 22, 2023

1. SQL: handle "DATABASE" and "SCHEMA" keywords specially only when they… …

   … come after "CREATE"
   
   Close universal-ctags#3636.
   
   The parser emitted the warning, "ignoring null tag in ...",
   when reading "alter database ..." from an input stream.
   The unexpected warning was originally reported in
   https://twitter.com/fujii_masao/status/1619860698997329920.
   
   This fix is inspired by the comment
   (universal-ctags#3636 (comment))
   submitted by Fujii Masao (@MasaoFujii).
   
   Fujii Masao illustrated the way for the correct fix:
   
       Probably it's valid to ignore ALTER statement in PostgreSQL, but
       what about other DBMS? I'm afraid that ALTER statement is not in
       SQL standard and other DBMS may handle the keyword "ALTER"
       differently from PostgreSQL.
   
       The cause of the issue seems that the keywords "DATABASE" and
       "SCHEMA" are processed even if they don't follow "CREATE". That
       is, the following SQL statements can cause ctags to emit warnings.
   
   	ALTER DATABASE ...
   	SELECT * FROM pg_locks WHERE database = ...
   
       To fix the issue, I think that the keywords "DATABASE" and
       "SCHEMA" should be processed only just after the keyword "CREATE"
       is processed. How about something like the following change?

   

   masatake committed Mar 22, 2023
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