Commit 4a25299

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Add tests for tuplesort.c.

Previously significant parts of tuplesort.c were untested. This commit, while not testing every path, significantly increases coverage. In particular, this adds tests for abbreviated key logic, forward/backward scans & scrolling and mark/restore. I tried to keep the table sizes reasonable, and stress the on-disk paths by setting work_mem to low values for specific tests. The buildfarm will tell whether more attention to test time is needed. Author: Andres Freund Discussion: https://postgr.es/m/20191013144153.ooxrfglvnaocsrx2@alap3.anarazel.de

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src/test/regress
- expected
  - tuplesort.out
- parallel_schedule
- sql
  - tuplesort.sql

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