feat: PatchMeasure member expression

[mcheshkov]

Check List

• Tests have been run in packages where changes made if available
• Linter has been run for changed code
• Tests for the changes have been added if not covered yet
• Docs have been added / updated if required

Description of Changes Made (if issue reference is not provided)

Add new member expression: PatchMeasure.
It allows to change aggregation type and add measure filters for existing measure. This is to allow queries like MIN(avgMeasure) and SUM(CASE dim = 'foo' WHEN TRUE THEN sumMeasure ELSE NULL END) in SQL API.

Under the hood

• SQL API now allows mismatched aggregation functions and aggregation on top of CASE in SQL pushdown rules, and rewrites that to special expression __patch_measure(measure_column, 'new_agg_type', boolean_expression)
• This expression is syntactic-only, it should never execute, instead it would be handled by wrapper SQL generation
• Generated member expression is passed to JS-side
• api-gateway evaluates it from JSON from JS functions
• BaseQuery and BaseMeasure now can handle new form: generate patched measure definition and use original measure during traversing and collecting

Supporting changes

• Changed rewrites for usual measures in SQL pushdown from just measure_column to MEASURE(measure_column), to make rewrites uniform
• Turn member expressions to tagged union in JSON representation

[codecov]

Codecov Report

Attention: Patch coverage is 88.24532% with 138 lines in your changes missing coverage. Please review.

Project coverage is 76.56%. Comparing base (a4fc5ec) to head (d522158).
Report is 2 commits behind head on master.

Files with missing lines	Patch %	Lines
...t/cubesql/cubesql/src/compile/engine/df/wrapper.rs	82.64%	55 Missing ⚠️
.../cubejs-schema-compiler/src/adapter/BaseMeasure.ts	3.33%	29 Missing ⚠️
...sql/src/compile/rewrite/rules/wrapper/aggregate.rs	95.61%	16 Missing ⚠️
packages/cubejs-api-gateway/src/gateway.ts	38.09%	10 Missing and 3 partials ⚠️
rust/cubesql/cubesql/src/transport/ext.rs	74.46%	12 Missing ⚠️
...t/cubesql/cubesql/src/compile/engine/udf/common.rs	87.75%	6 Missing ⚠️
...es/cubejs-schema-compiler/src/adapter/BaseQuery.js	42.85%	3 Missing and 1 partial ⚠️
packages/cubejs-api-gateway/src/query.js	85.71%	2 Missing ⚠️
rust/cubesql/cubesql/src/compile/rewrite/mod.rs	85.71%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           master    #9218       +/-   ##
===========================================
+ Coverage   47.86%   76.56%   +28.69%     
===========================================
  Files         171      400      +229     
  Lines       21312   105029    +83717     
  Branches     3687     3704       +17     
===========================================
+ Hits        10201    80414    +70213     
- Misses      10676    24179    +13503     
- Partials      435      436        +1     

Flag	Coverage Δ
cube-backend	47.80% <33.33%> (-0.06%)	⬇️
cubesql	83.91% <91.83%> (?)

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[waralexrom]

Let's at least add the word Path to the name of the patchedFrom field (ideally, of course, make it a structure with cubeName and Name). Otherwise, every time we come across such a code fragment, we will have to go to the patchedMeasure definition to understand what patchedFrom and its 0th and 1st elements represent