[fix] Adding space after -- for SQL comments

[john-bodley]

CATEGORY

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• Bug Fix
• Enhancement (new features, refinement)
• Refactor
• Add tests
• Build / Development Environment
• Documentation

SUMMARY

This PR fixes an issue where for some SQL dialects (MySQL) a SQL comment begins with two dashes -- and must be followed by at least one whitespace or control character as described here.

TEST PLAN

CI.

ADDITIONAL INFORMATION

• Has associated issue:
• Changes UI
• Requires DB Migration.
• Confirm DB Migration upgrade and downgrade tested.
• Introduces new feature or API
• Removes existing feature or API

REVIEWERS

to: @graceguo-supercat @michellethomas @mistercrunch

[codecov-io]

Codecov Report

Merging #7897 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #7897   +/-   ##
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  Coverage   65.79%   65.79%           
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  Files         461      461           
  Lines       22188    22188           
  Branches     2425     2425           
=======================================
  Hits        14598    14598           
  Misses       7469     7469           
  Partials      121      121

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