Revert back-branch changes in power()'s behavior for NaN inputs.
authorTom Lane
Wed, 2 May 2018 21:32:40 +0000 (17:32 -0400)
committerTom Lane
Wed, 2 May 2018 21:32:40 +0000 (17:32 -0400)
commitf74d83b3034f830bd68489b4aba99a4dee29c565
tree36391b2c01e9fcbf64727f3e3e0bafabf132c796
parentcec9d03d9165fd62544b63b7f236b9039f1adbe5
Revert back-branch changes in power()'s behavior for NaN inputs.

Per discussion, the value of fixing these bugs in the back branches
doesn't outweigh the downsides of changing corner-case behavior in
a minor release.  Hence, revert commits 217d8f3a1 and 4d864de48 in
the v10 branch and the corresponding commits in 9.3-9.6.

Discussion: https://postgr.es/m/75DB81BEEA95B445AE6D576A0A5C9E936A73E741@BPXM05GP.gisp.nec.co.jp
src/backend/utils/adt/float.c
src/test/regress/expected/float8-exp-three-digits-win32.out
src/test/regress/expected/float8-small-is-zero.out
src/test/regress/expected/float8-small-is-zero_1.out
src/test/regress/expected/float8.out
src/test/regress/sql/float8.sql