use TokenBigramSplitSymbolAlphaDigit parser instead of TokenBigramSplitSymbolAlpha by default.

so that we have less misses even though we have more noises.

to migrate, you can use the following SQL :

ALTER TABLE catalog_full_text
  DROP KEY title,
  DROP KEY description,
  ENGINE=mroonga,
  ADD FULLTEXT KEY title (`title`) COMMENT 'parser "TokenBigramSplitSymbolAlphaDigit"',
  ADD FULLTEXT KEY description (`description`) COMMENT 'parser "TokenBigramSplitSymbolAlphaDigit"';

ALTER TABLE content_translation
  DROP KEY translated_text,
  ENGINE=mroonga,
  ADD FULLTEXT KEY translated_text (`translated_text`) COMMENT 'parser "TokenBigramSplitSymbolAlphaDigit"';

ALTER TABLE full_text
  DROP KEY SearchableText,
  ENGINE=mroonga,
  ADD FULLTEXT KEY SearchableText (`SearchableText`) COMMENT 'parser "TokenBigramSplitSymbolAlphaDigit"';

bt5/erp5_full_text_mroonga_catalog/CatalogMethodTemplateItem/portal_catalog/erp5_mysql_innodb/z_create_catalog_fulltext.xml

@@ -67,8 +67,8 @@ CREATE TABLE `catalog_full_text` (\n
   `title` varchar(255) default \'\',\n
   `description` text,\n
   PRIMARY KEY  (`uid`),\n
-  FULLTEXT `title` (`title`) COMMENT \'parser "TokenBigramSplitSymbolAlpha"\',\n
-  FULLTEXT `description` (`description`) COMMENT \'parser "TokenBigramSplitSymbolAlpha"\'\n
+  FULLTEXT `title` (`title`) COMMENT \'parser "TokenBigramSplitSymbolAlphaDigit"\',\n
+  FULLTEXT `description` (`description`) COMMENT \'parser "TokenBigramSplitSymbolAlphaDigit"\'\n
 ) ENGINE=mroonga;\n
 </string> </value>
         </item>

bt5/erp5_full_text_mroonga_catalog/CatalogMethodTemplateItem/portal_catalog/erp5_mysql_innodb/z_create_content_translation.xml

@@ -64,7 +64,7 @@
   `content_language` VARBINARY(100),\n
   `translated_text` TEXT,\n
   PRIMARY KEY (`uid`, `property_name`, `content_language`),\n
-  FULLTEXT KEY (`translated_text`) COMMENT \'parser "TokenBigramSplitSymbolAlpha"\'\n
+  FULLTEXT KEY (`translated_text`) COMMENT \'parser "TokenBigramSplitSymbolAlphaDigit"\'\n
 ) ENGINE=mroonga;\n
 </string> </value>
         </item>

bt5/erp5_full_text_mroonga_catalog/CatalogMethodTemplateItem/portal_catalog/erp5_mysql_innodb/z_create_fulltext.xml

@@ -66,7 +66,7 @@ CREATE TABLE `full_text` (\n
   `uid` BIGINT UNSIGNED NOT NULL,\n
   `SearchableText` MEDIUMTEXT,\n
   PRIMARY KEY  (`uid`),\n
-  FULLTEXT `SearchableText` (`SearchableText`) COMMENT \'parser "TokenBigramSplitSymbolAlpha"\'\n
+  FULLTEXT `SearchableText` (`SearchableText`) COMMENT \'parser "TokenBigramSplitSymbolAlphaDigit"\'\n
 ) ENGINE=mroonga;\n
 </string> </value>
         </item>