by unifdef https://github.com/MariaDB/server/commit/c24ad5c6cbce0d9e835ce3fa3aaf5ae43bf84eff
ok to push.
#define SPIDER_HAS_DISCOVER_TABLE_STRUCTURE should be removed.
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by unifdef https://github.com/MariaDB/server/commit/c24ad5c6cbce0d9e835ce3fa3aaf5ae43bf84eff