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Avoid some table rewrites for ALTER TABLE .. SET DATA TYPE timestamp.

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When the timezone is UTC, timestamptz and timestamp are binary coercible
in both directions.  See b8a18ad485 and
c22ecc6562 for the previous attempt in
this problem space.  Skip the table rewrite; for now, continue to
needlessly rewrite any index on an affected column.

Reviewed by Simon Riggs and Tom Lane.

Discussion: https://postgr.es/m/20190226061450.GA1665944@rfd.leadboat.com
This commit is contained in:
Noah Misch
2019-03-08 20:16:27 -08:00
parent 82a5649fb9
commit 3c5926301a
5 changed files with 65 additions and 7 deletions
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2
src/include/utils/timestamp.h
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@@ -104,4 +104,6 @@ extern int date2isoweek(int year, int mon, int mday);
extern int date2isoyear(int year, int mon, int mday);
extern int date2isoyearday(int year, int mon, int mday);
extern bool TimestampTimestampTzRequiresRewrite(void);
#endif /* TIMESTAMP_H */