Cherry-pick Enhancement: Add gpshrink to support elastic scaling. With some editions by me. (#32) #16
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…h some editions by me. (#32) In order to support gpshrink, similar to gpexpand, we first support "alter table <tablename> shrink table to <segnum>" to redistribute data on a specific number of segments. For gpshrink implementation, it is mainly divided into two stages similar to gpexpand: 1. Collect the tables that need to be shrink and write them into gpshrink.status_detail. 2. Perform data redistribution on the tables that need to be shrink, and delete specific segments in gp_segment_configuration.
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In order to support gpshrink, similar to gpexpand, we first support "alter table shrink table to " to redistribute data on a specific number of segments.
For gpshrink implementation, it is mainly divided into two stages similar to gpexpand:
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make installcheck