SQL: handle "DATABASE" and "SCHEMA" keywords specially only when they come after "CREATE" #3674
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Close #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
(#3636 (comment)) submitted by Fujii Masao (@MasaoFujii).
Fujii Masao illustrated the way for the correct fix: