[3.0] fix #1596 Major performance issue in case of many new entities (#1843) - backport from master #1863
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…ities (eclipse-ee4j#1843) * Issue 1596: use a hash-based collection to lookup objects in the cache instead of a linear search * Adjusted source according to review: - extended tests - updated copyright year - call removeObjectFromPrimaryKeyToNewObjects in preMergeChanges - remove list from primaryKeyToNewObjects if it is empty - simplify tests Signed-off-by: Patrick Schmitt <[email protected]> (cherry picked from commit 76d8274) Signed-off-by: Radek Felcman <[email protected]>
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(cherry picked from commit 76d8274)