Check List

• Tests has 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)

With this

• Load request extended with list of grouped subqueries to join with. Each subquery come with SQL string, alias, condition and join type. SQL is treated as static query, fully porcessed by SQL API. Condition - as member expression, because it can contain references to dimensions
• BaseQuery will add grouped subqueries to SQL after subquery dimensions and join tree parts
• Wrapper rewrite rules handle wrapper_pullup_replacer in join position of wrapped_select, but still mostly with empty list inside. Notable exception is aggregation flattening - it is allowed to try to flatten aggregation into WrappedSelect with non-empty joins.
• Wrapper pull up rules no handle trivial pulling up over single wrapped_select_join and over list WrappedSelectJoins list
• Wrapper replacers now have grouped_subqueries in a context, it is used to track qualifiers of grouped subqueries, to allow rewriting of column expressions referencing grouped subquery with push-to-cube active
• Converter from egraph to logical plan reconstructs schema for joins
• Penalize joins harder than wrappers. For queries ungrouped queries with grouped join, like SELECT * FROM (ungrouped) JOIN (grouped);, this would allow to prefer representation without join, but with wrapper. Without this cost change join representation would have higher ast_size_outside_wrapper component, but it is less important then wrapper_nodes, so wrapper representation would be more expensive.
• SQL generation for WrappedSelectNode will generate each grouped subquery separately, generate member expressions for join conditions and push all that to Cube
• Rewrite rules are too relaxed for now: they allow any push_to_cube=false query as grouped, which is incorrect, as we may drop push-to-Cube when wrapping WrappedSelect with another layer, even if inner WrappedSelect is projection. This is covered by check in SQL generation: only CubeScan(grouped=true) are allowed. This require new flag in wrapper replacers to fix.

Supporting changes:

• Extract CubeScanWrappedSqlNode from CubeScanWrapperNode. Both a logical plan nodes for now, Wrapper is generated during rewrites, and WrappedSql stores SQL, generated generated during evaluate_wrapped_sql
• Extracted __cubeJoinField join check to function, and make it stricter, only left.__cubeJoinField = right.__cubeJoinField is allowed
• Avoid clone calls in find_column_by_alias and __cubeJoinField join check
• Add PushToCubeContext in SQL generation code, used to track everything necessary to generate SQL for push-to-Cube case. For now it contains ungrouped CubeScanNode that whould be pushed into, and qualifiers and generated SQL for all grouped subqueries. Qualifiers are necessary to generate column expressions on top of ungrouped-grouped join.
• New copy_value! macro, to extend copy_flag!, allows to copy single value between different unary language variants
• Prettify extracted best plan and cost in logs