Fix REPACK with WITHOUT OVERLAPS replica identity indexes

Hi,

While testing UPDATE FOR PORTION OF, I started wondering whether REPACK supports temporal tables. In theory, it should, because temporal WITHOUT OVERLAPS indexes can be used as replica identity indexes. So I created a test script, repack_temporal.spec, which is included in the attached patch, and it failed.

I found that REPACK hard-codes BTEqualStrategyNumber when calling get_opfamily_member(). That seems wrong, because build_replindex_scan_key() uses IndexAmTranslateCompareType() to get the equality strategy for COMPARE_EQ.

After fixing the hard-coded BTEqualStrategyNumber, the temporal test passed. Then I added another test for multirange, repack_temporal_multirange.spec, which also failed. The reason is that find_target_tuple() uses the identity index to find the first tuple and returns it directly, but a lossy index scan may return false positives and require recheck.

Please see the attached patch for the fix details and test scripts.

Best regards,
--
Chao Li (Evan)
HighGo Software Co., Ltd.
https://www.highgo.com/