Zoltan Haindrich a0df8c8e6d Fix on-insert decompression for unique constraints
Inserting multiple rows into a compressed chunk could have bypassed
constraint check in case the table had segment_by columns.

Decompression is narrowed to only consider candidates by the actual
segment_by value.
Because of caching - decompression was skipped for follow-up rows of
the same Chunk.

Fixes #5553
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