Github user gengliangwang commented on the issue:
https://github.com/apache/spark/pull/18471
Most changes are done by my ruby script:
```ruby
lines = `./dev/lint-scala 2>&1 | grep "before\\|after"`.split("\n")
lines.each do |line|
file, line_num=line.split(/[ ,:]/)[1,2]
if line =~ /Space before token :/
`sed -i '' '#{line_num}s/ :/:/g' #{file}`
elsif line =~ /Space before token \)/
`sed -i '' '#{line_num}s/ )/)/g' #{file}`
elsif line =~ /Space after token \(/
`sed -i '' '#{line_num}s/( /(/g' #{file}`
end
end
```
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