Search Conditions for Multi-Column Inverted Columns
If you specify
search conditions for multi-column inverted columns, the search strategy is determined by the system as specified in the table.
Search Condition |
Search Strategy |
Multiple equality conditions for multiple multi-column inverted columns that together form a complete index. |
The lines whose keys are contained in the corresponding inversion list of the index. |
An IN condition for a multi-column inverted column, equality conditions for multiple other multi-column inverted columns. |
The system accesses the lines whose keys are contained in the inversion lists. |
Area Conditions
Multiple equality or area conditions, linked by AND, for multiple multi-column inverted columns An index is formed by multiple columns (n number). |
If there is an equality condition or an area condition for the first k (k<=n) columns of the index (only for the kth column may a condition be specified with < or >), only those lines whose keys are in the inversion lists in the specified area are accessed. |
For every search condition, there are also queries for which it is not necessary to access the lines, as all required values are contained in the inversion list(s).
See also:
Examples: Search Conditions for Multi-Column Inverted Columns