Changeset: 82b8cec92520 for MonetDB
URL: http://dev.monetdb.org/hg/MonetDB?cmd=changeset;node=82b8cec92520
Modified Files:
gdk/gdk_select.c
Branch: default
Log Message:
Extended thetasubselect with operator <> / !=.
This is equivalent to a anti-select.
diffs (39 lines):
diff --git a/gdk/gdk_select.c b/gdk/gdk_select.c
--- a/gdk/gdk_select.c
+++ b/gdk/gdk_select.c
@@ -1356,9 +1356,10 @@ BATsubselect(BAT *b, BAT *s, const void
* candidates. s should be sorted on the tail value.
*
* Theta select returns all values from b which are less/greater than
- * or equal to the provided value depending on the value of op. Op is
- * a string with one of the values: "=", "==", "<", "<=", ">", ">="
- * (the first two are equivalent). Theta select never returns nils.
+ * or (not) equal to the provided value depending on the value of op.
+ * Op is a string with one of the values: "=", "==", "<", "<=", ">",
+ * ">=", "<>", "!=" (the first two are equivalent and the last two are
+ * equivalent). Theta select never returns nils.
*
* If value is nil, the result is empty.
*/
@@ -1378,6 +1379,10 @@ BATthetasubselect(BAT *b, BAT *s, const
/* "=" or "==" */
return BATsubselect(b, s, val, NULL, 1, 1, 0);
}
+ if (op[0] == '!' && op[1] == '=' && op[2] == 0) {
+ /* "!=" (equivalent to "<>") */
+ return BATsubselect(b, s, val, NULL, 1, 1, 1);
+ }
if (op[0] == '<') {
if (op[1] == 0) {
/* "<" */
@@ -1387,6 +1392,10 @@ BATthetasubselect(BAT *b, BAT *s, const
/* "<=" */
return BATsubselect(b, s, nil, val, 0, 1, 0);
}
+ if (op[1] == '>' && op[2] == 0) {
+ /* "<>" (equivalent to "!=") */
+ return BATsubselect(b, s, val, NULL, 1, 1, 1);
+ }
}
if (op[0] == '>') {
if (op[1] == 0) {
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