Fix avro regression

The fact whether a query explicitly defined a query was ignored by the
statement parsing function and it always assumed the database was
explicitly defined. This caused the TABLE keyword in a CREATE TABLE
statement to be falsely identified as the current database.

server/modules/routing/avrorouter/avro_schema.c

@@ -403,10 +403,12 @@ static bool get_table_name(const char* sql, char* dest)
 
 /**
  * Extract the database name from a CREATE TABLE statement
+ *
  * @param sql SQL statement
  * @param dest Destination where the database name is extracted. Must be at least
  *             MYSQL_DATABASE_MAXLEN bytes long.
- * @return True if extraction was successful
+ *
+ * @return True if a database name was extracted
  */
 static bool get_database_name(const char* sql, char* dest)
 {
@@ -426,6 +428,10 @@ static bool get_database_name(const char* sql, char* dest)
             ptr--;
         }
 
+        if (*ptr == '.')
+        {
+            // The query defines an explicit database
+
             while (*ptr == '`' || *ptr == '.' || isspace(*ptr))
             {
                 ptr--;
@@ -443,6 +449,7 @@ static bool get_database_name(const char* sql, char* dest)
             dest[end - ptr] = '\0';
             rval = true;
         }
+    }
 
     return rval;
 }
@@ -717,13 +724,15 @@ TABLE_CREATE* table_create_alloc(const char* sql, int len, const char* db)
     {
         err = "table name";
     }
-        /** The CREATE statement contains the database name */
+
     if (get_database_name(sql, database))
     {
+        // The CREATE statement contains the database name
         db = database;
     }
     else if (*db == '\0')
     {
+        // No explicit or current database
         err = "database name";
     }