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fix(spanner): quote database names when creating databases - #19053
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Previously, the client only quoted database names in CREATE DATABASE statements if they contained a hyphen. If a database name matched a reserved SQL keyword (such as default or user), or was created without a hyphen under PostgreSQL dialect, the statement was sent without quotes, causing syntax errors from Cloud Spanner. This change: - Unconditionally quotes database names in CREATE DATABASE statements using backticks for GoogleSQL and double quotes for PostgreSQL, aligning with the reference Java and Go clients. - Properly escapes quote and delimiter characters to prevent DDL injection breakouts. - Relies on Cloud Spanner server-side validation for invalid database identifiers rather than maintaining brittle client-side keyword lists.
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This pull request updates the database creation logic in both the synchronous and asynchronous Spanner database clients to always quote and escape the database ID based on the database dialect (GoogleSQL or PostgreSQL). Previously, quoting was only applied if the database ID contained a hyphen. The changes ensure that special characters and reserved keywords are properly handled. Corresponding unit tests have been updated and expanded to cover various edge cases, including escaping delimiters and handling reserved keywords for both dialects. I have no further feedback to provide as there are no review comments.
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Previously, the client only quoted database names in CREATE DATABASE statements if they contained a hyphen. If a database name matched a reserved SQL keyword (such as default or user), or was created without a hyphen under PostgreSQL dialect, the statement was sent without quotes, causing syntax errors from Cloud Spanner.
This change: