diff options
Diffstat (limited to 'src/include/access/skey.h')
| -rw-r--r-- | src/include/access/skey.h | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/src/include/access/skey.h b/src/include/access/skey.h index fcf81ba6ab..c30a44bde3 100644 --- a/src/include/access/skey.h +++ b/src/include/access/skey.h @@ -60,6 +60,11 @@ typedef uint16 StrategyNumber; * supported only for index scans, not heap scans; and not all index AMs * support them. * + * A ScanKey can also represent an ordering operator invocation, that is + * an ordering requirement "ORDER BY indexedcol op constant". This looks + * the same as a comparison operator, except that the operator doesn't + * (usually) yield boolean. We mark such ScanKeys with SK_ORDER_BY. + * * Note: in some places, ScanKeys are used as a convenient representation * for the invocation of an access method support procedure. In this case * sk_strategy/sk_subtype are not meaningful, and sk_func may refer to a @@ -122,6 +127,7 @@ typedef ScanKeyData *ScanKey; #define SK_SEARCHNULL 0x0020 /* scankey represents "col IS NULL" */ #define SK_SEARCHNOTNULL 0x0040 /* scankey represents "col IS NOT * NULL" */ +#define SK_ORDER_BY 0x0080 /* scankey is for ORDER BY op */ /* |