mi_boolean mi_qual_constisnull(MI_AM_QUAL_DESC *qualDesc);
The Return Value column shows the results of the mi_qual_constisnull() function for various constant arguments.
| Sample Function | Description | Return Value |
|---|---|---|
| function(column, 10) | The arguments specify the explicit non-NULL constant value 10. | MI_FALSE |
| function(column, NULL) | The arguments specify an explicit NULL value. | MI_TRUE |
The form function(column,?) should not occur because the qualification descriptor that the database server passes to the am_beginscan or am_getnext purpose function contains values for any host-variable argument.
Do not call this function from the am_scancost purpose function. Use mi_qual_constisnull_nohostvar() instead.
MI_TRUE indicates that the arguments include an explicit NULL-valued constant.