| index_name | TEXT | The name of the index. |
| table_name | TEXT | The name of the table associated with the index. |
| type | TEXT | One of primary or aggregating. |
| expression | ARRAY (TEXT) | An ordered array of the expression in SQL that defined the index. |
| size_compressed | DOUBLE PRECISION | The size of the index in bytes. |
| size_uncompressed | DOUBLE PRECISION | The uncompressed size of the index in bytes. |
| compression_ratio | DOUBLE PRECISION | The compression ratio (<size_uncompressed>/<size_compressed>). |
| number_of_segments | INTEGER | The number of segments comprising the table. |