Equation tests 2

[codecov-io]

Codecov Report

Merging #230 into master will decrease coverage by <.01%. The diff coverage is 84.52%.

@@            Coverage Diff             @@
##           master     #230      +/-   ##
==========================================
- Coverage   95.65%   95.64%   -0.01%     
==========================================
  Files        1144     1145       +1     
  Lines       57355    57434      +79     
  Branches     2982     2984       +2     
==========================================
+ Hits        54864    54934      +70     
- Misses       2485     2494       +9     
  Partials        6        6

Impacted Files	Coverage Δ
src/expr-library/assert/throw-if-null.ts	100% <100%> (ø)	:arrow_up:
src/query-base/util/operation/index.ts	100% <100%> (ø)	:arrow_up:
src/query-base/util/operation/throw-if-null.ts	100% <100%> (ø)
src/unified-query/query-impl.ts	98.85% <100%> (+0.01%)	:arrow_up:
src/ast/sqlfier/index.ts	100% <100%> (ø)	:arrow_up:
src/ast/parentheses.ts	84.67% <44.44%> (-2.93%)	:arrow_down:
src/error/execution-error.ts	73.94% <60%> (-2.29%)	:arrow_down:
...e/is-zero-or-one-row-using-compound-query-limit.ts	100% <0%> (+26.66%)	:arrow_up:

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[AnyhowStep]

The parenthesesSqlfier is exercised by tsql-mysql-5.7

[AnyhowStep]

ParseError is simple enough and shouldn't need tests