Github user zellerh commented on a diff in the pull request:
https://github.com/apache/incubator-trafodion/pull/946#discussion_r100204362
--- Diff: core/sql/optimizer/BindRelExpr.cpp ---
@@ -10600,34 +10600,45 @@ Upsert is also converted into merge when
TRAF_UPSERT_MODE is set to MERGE and
there are omitted cols with default values in case of aligned format table
or
omitted current timestamp cols in case of non-aligned row format
*/
-NABoolean Insert::isUpsertThatNeedsMerge(NABoolean isAlignedRowFormat,
NABoolean omittedDefaultCols,
- NABoolean
omittedCurrentDefaultClassCols) const
+NABoolean Insert::isUpsertThatNeedsTransformation(NABoolean
isAlignedRowFormat,
+ NABoolean
omittedDefaultCols,
+ NABoolean
omittedCurrentDefaultClassCols,
+ NABoolean &toMerge) const
{
- // The necessary conditions to convert upsert to merge and
+ // The necessary conditions to transform upsert
if (isUpsert() &&
(NOT getIsTrafLoadPrep()) &&
- (NOT (getTableDesc()->isIdentityColumnGeneratedAlways() &&
getTableDesc()->hasIdentityColumnInClusteringKey())) &&
+ (NOT (getTableDesc()->isIdentityColumnGeneratedAlways() &&
--- End diff --
Maybe add a comment here that tables with an identity or syskey column
never encounter any duplicate rows on insert/upsert.
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