RaigorJiang opened a new pull request, #38687:
URL: https://github.com/apache/shardingsphere/pull/38687
### Summary:
This PR introduces a dedicated distSQLIdentifier rule for DistSQL metadata
commands, so SHOW TABLE METADATA and REFRESH TABLE METADATA can accept bare
identifiers, backtick-quoted
identifiers, and double-quoted identifiers, while single quotes remain
string literals and are no longer treated as object names.
### What changed:
- Updated the DistSQL grammar to use distSQLIdentifier for table,
database, schema, and storage unit name positions.
- Switched the statement and executor flow to carry IdentifierValue where
quoted name semantics must be preserved.
- Added parser IT coverage that verifies both the identifier value and its
quote delimiters.
- Updated the SHOW/REFRESH TABLE METADATA documentation in English and
Chinese to match the new syntax and examples.
### Impact:
- PostgreSQL uppercase and lowercase table names are handled correctly
when quoted.
- MySQL uppercase and lowercase table names are handled correctly when
quoted.
- The parser no longer accepts single-quoted strings as table or schema
identifiers for these commands.
- The change is scoped to DistSQL metadata commands and does not affect
unrelated SQL syntax.
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