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6d35506647
Add support for reversed executable comments using /*!!version */ and /*M!!version */ syntax. These execute the comment body only when the server version is strictly less than the specified version, which is the inverse of the existing /*!version */ syntax. This enables writing portable SQL that uses newer syntax on new servers while falling back to older syntax on older servers, e.g.: CREATE /*!100000 OR REPLACE */ TABLE /*!!100000 IF NOT EXISTS */ t1 ... On MariaDB >= 10.0 this expands to CREATE OR REPLACE TABLE t1, while on older versions it expands to CREATE TABLE IF NOT EXISTS t1. Implementation: in lex_one_token(), after detecting a versioned comment (/*! or /*M!), check for an additional '!' character. If present, invert the version comparison so the comment body is expanded only when MYSQL_VERSION_ID < version. Tests added to main.comments and plugins.server_audit confirming: - Reversed comments with version <= server version do not execute - Reversed comments with version > server version execute - MariaDB-specific /*M!! variant works correctly - Reversed comments without a version number always execute - Audit plugin correctly logs executed reversed comments - Combined forward + reversed comments in a single statement All new code of the whole pull request, including one or several files that are either new files or modified ones, are contributed under the BSD-new license. I am contributing on behalf of my employer Amazon Web Services, Inc. |
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