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Fix for MDEV-5891 - ensure select on empty backing table works.

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andrew 2014-04-02 23:02:32 +10:30
commit a4a78e3c33
1 changed files with 6 additions and 1 deletions
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7
storage/oqgraph/graphcore.cc
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@ -1122,7 +1122,12 @@ int edges_cursor::fetch_row(const row &row_info, row &result,
// but origid and destid can be -1 indicating no such record, NULL? but oqgraph3::vertex_id
// seems to resolve to VertexID (unsigned) in row
// in any case we should check for errors (-1) in origid... because all edges have at least one vertex by definition
assert( ! ((size_t)orig == (size_t)-1 && (size_t)dest == (size_t)-1)); // indicates we havent handle a HA_ERR_RECORD_DELETED somewhere
if (orig == (oqgraph3::vertex_id)-1 && dest == (oqgraph3::vertex_id)-1) {
// Select * from graph; -- when backing store is empty (bug MDEV-5891)
return oqgraph::NO_MORE_DATA;
}
// assert( ! ((size_t)orig == (size_t)-1 && (size_t)dest == (size_t)-1));
// indicates we havent handle a HA_ERR_RECORD_DELETED somewhere
result.orig= orig;
result.dest= dest;