fix compatibility #1292

[yuanfan]

compatibility support for auto create primary key named "primary" .

[yuanfan]

update the fix code. compatibility support for auto create primary key named "primary" .

[codecov-io]

Codecov Report

Merging #1294 into master will decrease coverage by 0.01%. The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #1294      +/-   ##
==========================================
- Coverage   57.35%   57.34%   -0.02%     
==========================================
  Files          44       44              
  Lines        7818     7818              
==========================================
- Hits         4484     4483       -1     
  Misses       2777     2777              
- Partials      557      558       +1

Impacted Files	Coverage Δ
dialect_postgres.go	76.11% <100%> (ø)	:arrow_up:
xorm.go	66.66% <0%> (-1.52%)	:arrow_down:

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[lunny]

Any ref document? Which postgres version are you using?