MonetDB: Jun2020 - Use consistent 0 hseq for empty candidate lists.

[Sjoerd Mullender]

Changeset: d40990b548dd for MonetDB
URL: https://dev.monetdb.org/hg/MonetDB?cmd=changeset;node=d40990b548dd
Modified Files:
        gdk/gdk_cand.c
Branch: Jun2020
Log Message:

Use consistent 0 hseq for empty candidate lists.


diffs (12 lines):

diff --git a/gdk/gdk_cand.c b/gdk/gdk_cand.c
--- a/gdk/gdk_cand.c
+++ b/gdk/gdk_cand.c
@@ -369,7 +369,7 @@ canditer_init(struct canditer *ci, BAT *
        assert(ci != NULL);
 
        if (s == NULL) {
-               if (b == NULL) {
+               if (b == NULL || BATcount(b) == 0) {
                        /* trivially empty candidate list */
                        *ci = (struct canditer) {
                                .tpe = cand_dense,
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