[GitHub] [doris] morningman commented on a diff in pull request #10213: [fix](auth) Authentication exception when the name of database or table contains an underscore in grant statement.

[GitBox <gi...@apache.org>]

morningman commented on code in PR #10213:
URL: https://github.com/apache/doris/pull/10213#discussion_r901039146


##########
fe/fe-core/src/main/java/org/apache/doris/mysql/privilege/DbPrivEntry.java:
##########
@@ -70,8 +70,7 @@ private static PatternMatcher createDbPatternMatcher(String db) throws AnalysisE
             dbCaseSensibility = false;
         }
 
-        PatternMatcher dbPattern = PatternMatcher.createMysqlPattern(db.equals(ANY_DB) ? "%" : db, dbCaseSensibility);
-        return dbPattern;
+        return  PatternMatcher.createFlatPattern(db, dbCaseSensibility, db.equals(ANY_DB));

Review Comment:
   ```suggestion
           return PatternMatcher.createFlatPattern(db, dbCaseSensibility, db.equals(ANY_DB));
   ```



##########
fe/fe-core/src/main/java/org/apache/doris/common/PatternMatcher.java:
##########
@@ -20,27 +20,58 @@
 import com.google.common.base.Strings;
 import com.google.common.collect.Sets;
 
+import java.util.Locale;
 import java.util.Set;
 import java.util.regex.Pattern;
 
 // Wrap for Java pattern and matcher
 public class PatternMatcher {
+    public static final PatternMatcher MATCH_ANY = new PatternMatcher(Pattern.compile(".*"));
     private Pattern pattern;
+    private String flatPattern;

Review Comment:
   Add some comment in code to explain the different between `pattern` and `flatPattern`. Better to give some example.
   And looks like the `flatPattern` is not a real pattern, more like an `origin string`?



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