# Default schema columns

This section presents the detailed information about the default schema columns provided natively with the tSynonymSearch component.

Tip: In addition to the matching-related information presented in the default schema columns, you need to define more columns in order to output the input data and their matched reference entries.

| Columns | Description |
| --- | --- |
| *GID* | Group IDs. These IDs are created automatically at runtime to<br>index the input data groups recognized by this component. |
| *GRP\_SIZE* | Numbers of the matched reference entries for each group of the<br>input data. This size is limited by the number you set in the<br>Limit of each group field<br>and presents always the entries scored the highest. |
| *SCORE* | Lucene score used to measure in total the match degree between<br>the selected input columns and their matched reference entries.<br>The Lucene score is a numerical value that starts from<br>*0* and is not bounded. Good matches<br>will usually score higher than *1*, but there<br>is no definite rule to choose what is a good match and what is a<br>bad match. |
| *SCORES* | Lucene scores used to measure the match degree between each<br>input column you have selected and its matching reference<br>entries. |
| *NB\_MATCHED \_FIELDS* | Number of the input columns you have selected for the matching<br>operation. |